/*
* Performance counter core code
*
- * Copyright(C) 2008 Thomas Gleixner <tglx@linutronix.de>
- * Copyright(C) 2008 Red Hat, Inc., Ingo Molnar
+ * Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
+ * Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
+ * Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
+ * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
*
- * For licencing details see kernel-base/COPYING
+ * For licensing details see kernel-base/COPYING
*/
#include <linux/fs.h>
+#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/file.h>
#include <linux/poll.h>
#include <linux/sysfs.h>
-#include <linux/ptrace.h>
+#include <linux/dcache.h>
#include <linux/percpu.h>
+#include <linux/ptrace.h>
+#include <linux/vmstat.h>
+#include <linux/hardirq.h>
+#include <linux/rculist.h>
#include <linux/uaccess.h>
#include <linux/syscalls.h>
#include <linux/anon_inodes.h>
#include <linux/kernel_stat.h>
#include <linux/perf_counter.h>
+#include <asm/irq_regs.h>
+
/*
* Each CPU has a list of per CPU counters:
*/
static int perf_reserved_percpu __read_mostly;
static int perf_overcommit __read_mostly = 1;
+static atomic_t nr_counters __read_mostly;
+static atomic_t nr_mmap_counters __read_mostly;
+static atomic_t nr_comm_counters __read_mostly;
+
+/*
+ * perf counter paranoia level:
+ * 0 - not paranoid
+ * 1 - disallow cpu counters to unpriv
+ * 2 - disallow kernel profiling to unpriv
+ */
+int sysctl_perf_counter_paranoid __read_mostly;
+
+static inline bool perf_paranoid_cpu(void)
+{
+ return sysctl_perf_counter_paranoid > 0;
+}
+
+static inline bool perf_paranoid_kernel(void)
+{
+ return sysctl_perf_counter_paranoid > 1;
+}
+
+int sysctl_perf_counter_mlock __read_mostly = 512; /* 'free' kb per user */
+
+/*
+ * max perf counter sample rate
+ */
+int sysctl_perf_counter_sample_rate __read_mostly = 100000;
+
+static atomic64_t perf_counter_id;
+
/*
- * Mutex for (sysadmin-configurable) counter reservations:
+ * Lock for (sysadmin-configurable) counter reservations:
*/
-static DEFINE_MUTEX(perf_resource_mutex);
+static DEFINE_SPINLOCK(perf_resource_lock);
/*
* Architecture provided APIs - weak aliases:
*/
-extern __weak const struct hw_perf_counter_ops *
-hw_perf_counter_init(struct perf_counter *counter)
+extern __weak const struct pmu *hw_perf_counter_init(struct perf_counter *counter)
{
return NULL;
}
-u64 __weak hw_perf_save_disable(void) { return 0; }
-void __weak hw_perf_restore(u64 ctrl) { barrier(); }
-void __weak hw_perf_counter_setup(void) { barrier(); }
-int __weak hw_perf_group_sched_in(struct perf_counter *group_leader,
+void __weak hw_perf_disable(void) { barrier(); }
+void __weak hw_perf_enable(void) { barrier(); }
+
+void __weak hw_perf_counter_setup(int cpu) { barrier(); }
+
+int __weak
+hw_perf_group_sched_in(struct perf_counter *group_leader,
struct perf_cpu_context *cpuctx,
struct perf_counter_context *ctx, int cpu)
{
void __weak perf_counter_print_debug(void) { }
+static DEFINE_PER_CPU(int, disable_count);
+
+void __perf_disable(void)
+{
+ __get_cpu_var(disable_count)++;
+}
+
+bool __perf_enable(void)
+{
+ return !--__get_cpu_var(disable_count);
+}
+
+void perf_disable(void)
+{
+ __perf_disable();
+ hw_perf_disable();
+}
+
+void perf_enable(void)
+{
+ if (__perf_enable())
+ hw_perf_enable();
+}
+
+static void get_ctx(struct perf_counter_context *ctx)
+{
+ WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
+}
+
+static void free_ctx(struct rcu_head *head)
+{
+ struct perf_counter_context *ctx;
+
+ ctx = container_of(head, struct perf_counter_context, rcu_head);
+ kfree(ctx);
+}
+
+static void put_ctx(struct perf_counter_context *ctx)
+{
+ if (atomic_dec_and_test(&ctx->refcount)) {
+ if (ctx->parent_ctx)
+ put_ctx(ctx->parent_ctx);
+ if (ctx->task)
+ put_task_struct(ctx->task);
+ call_rcu(&ctx->rcu_head, free_ctx);
+ }
+}
+
+static void unclone_ctx(struct perf_counter_context *ctx)
+{
+ if (ctx->parent_ctx) {
+ put_ctx(ctx->parent_ctx);
+ ctx->parent_ctx = NULL;
+ }
+}
+
+/*
+ * If we inherit counters we want to return the parent counter id
+ * to userspace.
+ */
+static u64 primary_counter_id(struct perf_counter *counter)
+{
+ u64 id = counter->id;
+
+ if (counter->parent)
+ id = counter->parent->id;
+
+ return id;
+}
+
+/*
+ * Get the perf_counter_context for a task and lock it.
+ * This has to cope with with the fact that until it is locked,
+ * the context could get moved to another task.
+ */
+static struct perf_counter_context *
+perf_lock_task_context(struct task_struct *task, unsigned long *flags)
+{
+ struct perf_counter_context *ctx;
+
+ rcu_read_lock();
+ retry:
+ ctx = rcu_dereference(task->perf_counter_ctxp);
+ if (ctx) {
+ /*
+ * If this context is a clone of another, it might
+ * get swapped for another underneath us by
+ * perf_counter_task_sched_out, though the
+ * rcu_read_lock() protects us from any context
+ * getting freed. Lock the context and check if it
+ * got swapped before we could get the lock, and retry
+ * if so. If we locked the right context, then it
+ * can't get swapped on us any more.
+ */
+ spin_lock_irqsave(&ctx->lock, *flags);
+ if (ctx != rcu_dereference(task->perf_counter_ctxp)) {
+ spin_unlock_irqrestore(&ctx->lock, *flags);
+ goto retry;
+ }
+
+ if (!atomic_inc_not_zero(&ctx->refcount)) {
+ spin_unlock_irqrestore(&ctx->lock, *flags);
+ ctx = NULL;
+ }
+ }
+ rcu_read_unlock();
+ return ctx;
+}
+
+/*
+ * Get the context for a task and increment its pin_count so it
+ * can't get swapped to another task. This also increments its
+ * reference count so that the context can't get freed.
+ */
+static struct perf_counter_context *perf_pin_task_context(struct task_struct *task)
+{
+ struct perf_counter_context *ctx;
+ unsigned long flags;
+
+ ctx = perf_lock_task_context(task, &flags);
+ if (ctx) {
+ ++ctx->pin_count;
+ spin_unlock_irqrestore(&ctx->lock, flags);
+ }
+ return ctx;
+}
+
+static void perf_unpin_context(struct perf_counter_context *ctx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctx->lock, flags);
+ --ctx->pin_count;
+ spin_unlock_irqrestore(&ctx->lock, flags);
+ put_ctx(ctx);
+}
+
+/*
+ * Add a counter from the lists for its context.
+ * Must be called with ctx->mutex and ctx->lock held.
+ */
static void
list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
{
* add it straight to the context's counter list, or to the group
* leader's sibling list:
*/
- if (counter->group_leader == counter)
+ if (group_leader == counter)
list_add_tail(&counter->list_entry, &ctx->counter_list);
- else
+ else {
list_add_tail(&counter->list_entry, &group_leader->sibling_list);
+ group_leader->nr_siblings++;
+ }
+
+ list_add_rcu(&counter->event_entry, &ctx->event_list);
+ ctx->nr_counters++;
+ if (counter->attr.inherit_stat)
+ ctx->nr_stat++;
}
+/*
+ * Remove a counter from the lists for its context.
+ * Must be called with ctx->mutex and ctx->lock held.
+ */
static void
list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
{
struct perf_counter *sibling, *tmp;
+ if (list_empty(&counter->list_entry))
+ return;
+ ctx->nr_counters--;
+ if (counter->attr.inherit_stat)
+ ctx->nr_stat--;
+
list_del_init(&counter->list_entry);
+ list_del_rcu(&counter->event_entry);
+
+ if (counter->group_leader != counter)
+ counter->group_leader->nr_siblings--;
/*
* If this was a group counter with sibling counters then
list_for_each_entry_safe(sibling, tmp,
&counter->sibling_list, list_entry) {
- list_del_init(&sibling->list_entry);
- list_add_tail(&sibling->list_entry, &ctx->counter_list);
+ list_move_tail(&sibling->list_entry, &ctx->counter_list);
sibling->group_leader = sibling;
}
}
+static void
+counter_sched_out(struct perf_counter *counter,
+ struct perf_cpu_context *cpuctx,
+ struct perf_counter_context *ctx)
+{
+ if (counter->state != PERF_COUNTER_STATE_ACTIVE)
+ return;
+
+ counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->tstamp_stopped = ctx->time;
+ counter->pmu->disable(counter);
+ counter->oncpu = -1;
+
+ if (!is_software_counter(counter))
+ cpuctx->active_oncpu--;
+ ctx->nr_active--;
+ if (counter->attr.exclusive || !cpuctx->active_oncpu)
+ cpuctx->exclusive = 0;
+}
+
+static void
+group_sched_out(struct perf_counter *group_counter,
+ struct perf_cpu_context *cpuctx,
+ struct perf_counter_context *ctx)
+{
+ struct perf_counter *counter;
+
+ if (group_counter->state != PERF_COUNTER_STATE_ACTIVE)
+ return;
+
+ counter_sched_out(group_counter, cpuctx, ctx);
+
+ /*
+ * Schedule out siblings (if any):
+ */
+ list_for_each_entry(counter, &group_counter->sibling_list, list_entry)
+ counter_sched_out(counter, cpuctx, ctx);
+
+ if (group_counter->attr.exclusive)
+ cpuctx->exclusive = 0;
+}
+
/*
* Cross CPU call to remove a performance counter
*
struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_counter *counter = info;
struct perf_counter_context *ctx = counter->ctx;
- unsigned long flags;
- u64 perf_flags;
/*
* If this is a task context, we need to check whether it is
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- curr_rq_lock_irq_save(&flags);
spin_lock(&ctx->lock);
-
- if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
- counter->state = PERF_COUNTER_STATE_INACTIVE;
- counter->hw_ops->disable(counter);
- ctx->nr_active--;
- cpuctx->active_oncpu--;
- counter->task = NULL;
- counter->oncpu = -1;
- }
- ctx->nr_counters--;
-
/*
* Protect the list operation against NMI by disabling the
- * counters on a global level. NOP for non NMI based counters.
+ * counters on a global level.
*/
- perf_flags = hw_perf_save_disable();
+ perf_disable();
+
+ counter_sched_out(counter, cpuctx, ctx);
+
list_del_counter(counter, ctx);
- hw_perf_restore(perf_flags);
if (!ctx->task) {
/*
perf_max_counters - perf_reserved_percpu);
}
+ perf_enable();
spin_unlock(&ctx->lock);
- curr_rq_unlock_irq_restore(&flags);
}
/*
* Remove the counter from a task's (or a CPU's) list of counters.
*
- * Must be called with counter->mutex held.
+ * Must be called with ctx->mutex held.
*
* CPU counters are removed with a smp call. For task counters we only
* call when the task is on a CPU.
+ *
+ * If counter->ctx is a cloned context, callers must make sure that
+ * every task struct that counter->ctx->task could possibly point to
+ * remains valid. This is OK when called from perf_release since
+ * that only calls us on the top-level context, which can't be a clone.
+ * When called from perf_counter_exit_task, it's OK because the
+ * context has been detached from its task.
*/
static void perf_counter_remove_from_context(struct perf_counter *counter)
{
* succeed.
*/
if (!list_empty(&counter->list_entry)) {
- ctx->nr_counters--;
list_del_counter(counter, ctx);
- counter->task = NULL;
}
spin_unlock_irq(&ctx->lock);
}
-static int
-counter_sched_in(struct perf_counter *counter,
- struct perf_cpu_context *cpuctx,
- struct perf_counter_context *ctx,
- int cpu)
+static inline u64 perf_clock(void)
{
- if (counter->state == PERF_COUNTER_STATE_OFF)
- return 0;
+ return cpu_clock(smp_processor_id());
+}
- counter->state = PERF_COUNTER_STATE_ACTIVE;
- counter->oncpu = cpu; /* TODO: put 'cpu' into cpuctx->cpu */
- /*
- * The new state must be visible before we turn it on in the hardware:
- */
- smp_wmb();
+/*
+ * Update the record of the current time in a context.
+ */
+static void update_context_time(struct perf_counter_context *ctx)
+{
+ u64 now = perf_clock();
- if (counter->hw_ops->enable(counter)) {
- counter->state = PERF_COUNTER_STATE_INACTIVE;
- counter->oncpu = -1;
- return -EAGAIN;
- }
+ ctx->time += now - ctx->timestamp;
+ ctx->timestamp = now;
+}
- cpuctx->active_oncpu++;
- ctx->nr_active++;
+/*
+ * Update the total_time_enabled and total_time_running fields for a counter.
+ */
+static void update_counter_times(struct perf_counter *counter)
+{
+ struct perf_counter_context *ctx = counter->ctx;
+ u64 run_end;
- return 0;
+ if (counter->state < PERF_COUNTER_STATE_INACTIVE)
+ return;
+
+ counter->total_time_enabled = ctx->time - counter->tstamp_enabled;
+
+ if (counter->state == PERF_COUNTER_STATE_INACTIVE)
+ run_end = counter->tstamp_stopped;
+ else
+ run_end = ctx->time;
+
+ counter->total_time_running = run_end - counter->tstamp_running;
}
/*
- * Cross CPU call to install and enable a performance counter
+ * Update total_time_enabled and total_time_running for all counters in a group.
*/
-static void __perf_install_in_context(void *info)
+static void update_group_times(struct perf_counter *leader)
+{
+ struct perf_counter *counter;
+
+ update_counter_times(leader);
+ list_for_each_entry(counter, &leader->sibling_list, list_entry)
+ update_counter_times(counter);
+}
+
+/*
+ * Cross CPU call to disable a performance counter
+ */
+static void __perf_counter_disable(void *info)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_counter *counter = info;
+ struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_counter_context *ctx = counter->ctx;
- int cpu = smp_processor_id();
- unsigned long flags;
- u64 perf_flags;
/*
- * If this is a task context, we need to check whether it is
- * the current task context of this cpu. If not it has been
- * scheduled out before the smp call arrived.
+ * If this is a per-task counter, need to check whether this
+ * counter's task is the current task on this cpu.
*/
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- curr_rq_lock_irq_save(&flags);
spin_lock(&ctx->lock);
/*
- * Protect the list operation against NMI by disabling the
- * counters on a global level. NOP for non NMI based counters.
+ * If the counter is on, turn it off.
+ * If it is in error state, leave it in error state.
*/
- perf_flags = hw_perf_save_disable();
-
- list_add_counter(counter, ctx);
- ctx->nr_counters++;
-
- counter_sched_in(counter, cpuctx, ctx, cpu);
-
- if (!ctx->task && cpuctx->max_pertask)
- cpuctx->max_pertask--;
-
- hw_perf_restore(perf_flags);
+ if (counter->state >= PERF_COUNTER_STATE_INACTIVE) {
+ update_context_time(ctx);
+ update_counter_times(counter);
+ if (counter == counter->group_leader)
+ group_sched_out(counter, cpuctx, ctx);
+ else
+ counter_sched_out(counter, cpuctx, ctx);
+ counter->state = PERF_COUNTER_STATE_OFF;
+ }
spin_unlock(&ctx->lock);
- curr_rq_unlock_irq_restore(&flags);
}
/*
- * Attach a performance counter to a context
- *
- * First we add the counter to the list with the hardware enable bit
- * in counter->hw_config cleared.
+ * Disable a counter.
*
- * If the counter is attached to a task which is on a CPU we use a smp
- * call to enable it in the task context. The task might have been
- * scheduled away, but we check this in the smp call again.
+ * If counter->ctx is a cloned context, callers must make sure that
+ * every task struct that counter->ctx->task could possibly point to
+ * remains valid. This condition is satisifed when called through
+ * perf_counter_for_each_child or perf_counter_for_each because they
+ * hold the top-level counter's child_mutex, so any descendant that
+ * goes to exit will block in sync_child_counter.
+ * When called from perf_pending_counter it's OK because counter->ctx
+ * is the current context on this CPU and preemption is disabled,
+ * hence we can't get into perf_counter_task_sched_out for this context.
*/
-static void
-perf_install_in_context(struct perf_counter_context *ctx,
- struct perf_counter *counter,
- int cpu)
+static void perf_counter_disable(struct perf_counter *counter)
{
+ struct perf_counter_context *ctx = counter->ctx;
struct task_struct *task = ctx->task;
- counter->ctx = ctx;
if (!task) {
/*
- * Per cpu counters are installed via an smp call and
- * the install is always sucessful.
+ * Disable the counter on the cpu that it's on
*/
- smp_call_function_single(cpu, __perf_install_in_context,
+ smp_call_function_single(counter->cpu, __perf_counter_disable,
counter, 1);
return;
}
- counter->task = task;
-retry:
- task_oncpu_function_call(task, __perf_install_in_context,
- counter);
+ retry:
+ task_oncpu_function_call(task, __perf_counter_disable, counter);
spin_lock_irq(&ctx->lock);
/*
- * we need to retry the smp call.
+ * If the counter is still active, we need to retry the cross-call.
*/
- if (ctx->nr_active && list_empty(&counter->list_entry)) {
+ if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
spin_unlock_irq(&ctx->lock);
goto retry;
}
/*
- * The lock prevents that this context is scheduled in so we
- * can add the counter safely, if it the call above did not
- * succeed.
+ * Since we have the lock this context can't be scheduled
+ * in, so we can change the state safely.
*/
- if (list_empty(&counter->list_entry)) {
- list_add_counter(counter, ctx);
- ctx->nr_counters++;
+ if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+ update_counter_times(counter);
+ counter->state = PERF_COUNTER_STATE_OFF;
}
+
spin_unlock_irq(&ctx->lock);
}
-static void
-counter_sched_out(struct perf_counter *counter,
- struct perf_cpu_context *cpuctx,
- struct perf_counter_context *ctx)
+static int
+counter_sched_in(struct perf_counter *counter,
+ struct perf_cpu_context *cpuctx,
+ struct perf_counter_context *ctx,
+ int cpu)
{
- if (counter->state != PERF_COUNTER_STATE_ACTIVE)
- return;
-
- counter->state = PERF_COUNTER_STATE_INACTIVE;
- counter->hw_ops->disable(counter);
- counter->oncpu = -1;
+ if (counter->state <= PERF_COUNTER_STATE_OFF)
+ return 0;
- cpuctx->active_oncpu--;
- ctx->nr_active--;
-}
+ counter->state = PERF_COUNTER_STATE_ACTIVE;
+ counter->oncpu = cpu; /* TODO: put 'cpu' into cpuctx->cpu */
+ /*
+ * The new state must be visible before we turn it on in the hardware:
+ */
+ smp_wmb();
-static void
-group_sched_out(struct perf_counter *group_counter,
- struct perf_cpu_context *cpuctx,
- struct perf_counter_context *ctx)
-{
- struct perf_counter *counter;
-
- if (group_counter->state != PERF_COUNTER_STATE_ACTIVE)
- return;
-
- counter_sched_out(group_counter, cpuctx, ctx);
-
- /*
- * Schedule out siblings (if any):
- */
- list_for_each_entry(counter, &group_counter->sibling_list, list_entry)
- counter_sched_out(counter, cpuctx, ctx);
-}
-
-void __perf_counter_sched_out(struct perf_counter_context *ctx,
- struct perf_cpu_context *cpuctx)
-{
- struct perf_counter *counter;
- u64 flags;
-
- if (likely(!ctx->nr_counters))
- return;
-
- spin_lock(&ctx->lock);
- flags = hw_perf_save_disable();
- if (ctx->nr_active) {
- list_for_each_entry(counter, &ctx->counter_list, list_entry)
- group_sched_out(counter, cpuctx, ctx);
+ if (counter->pmu->enable(counter)) {
+ counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->oncpu = -1;
+ return -EAGAIN;
}
- hw_perf_restore(flags);
- spin_unlock(&ctx->lock);
-}
-
-/*
- * Called from scheduler to remove the counters of the current task,
- * with interrupts disabled.
- *
- * We stop each counter and update the counter value in counter->count.
- *
- * This does not protect us against NMI, but disable()
- * sets the disabled bit in the control field of counter _before_
- * accessing the counter control register. If a NMI hits, then it will
- * not restart the counter.
- */
-void perf_counter_task_sched_out(struct task_struct *task, int cpu)
-{
- struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
- struct perf_counter_context *ctx = &task->perf_counter_ctx;
- if (likely(!cpuctx->task_ctx))
- return;
+ counter->tstamp_running += ctx->time - counter->tstamp_stopped;
- __perf_counter_sched_out(ctx, cpuctx);
+ if (!is_software_counter(counter))
+ cpuctx->active_oncpu++;
+ ctx->nr_active++;
- cpuctx->task_ctx = NULL;
-}
+ if (counter->attr.exclusive)
+ cpuctx->exclusive = 1;
-static void perf_counter_cpu_sched_out(struct perf_cpu_context *cpuctx)
-{
- __perf_counter_sched_out(&cpuctx->ctx, cpuctx);
+ return 0;
}
static int
}
/*
- * Return 1 for a software counter, 0 for a hardware counter
- */
-static inline int is_software_counter(struct perf_counter *counter)
-{
- return !counter->hw_event.raw && counter->hw_event.type < 0;
-}
-
-/*
* Return 1 for a group consisting entirely of software counters,
* 0 if the group contains any hardware counters.
*/
if (!is_software_counter(leader))
return 0;
+
list_for_each_entry(counter, &leader->sibling_list, list_entry)
if (!is_software_counter(counter))
return 0;
- return 1;
-}
-
-static void
-__perf_counter_sched_in(struct perf_counter_context *ctx,
- struct perf_cpu_context *cpuctx, int cpu)
-{
- struct perf_counter *counter;
- u64 flags;
- int can_add_hw = 1;
-
- if (likely(!ctx->nr_counters))
- return;
-
- spin_lock(&ctx->lock);
- flags = hw_perf_save_disable();
- list_for_each_entry(counter, &ctx->counter_list, list_entry) {
- /*
- * Listen to the 'cpu' scheduling filter constraint
- * of counters:
- */
- if (counter->cpu != -1 && counter->cpu != cpu)
- continue;
- /*
- * If we scheduled in a group atomically and exclusively,
- * or if this group can't go on, don't add any more
- * hardware counters.
- */
- if (can_add_hw || is_software_only_group(counter))
- if (group_sched_in(counter, cpuctx, ctx, cpu))
- can_add_hw = 0;
- }
- hw_perf_restore(flags);
- spin_unlock(&ctx->lock);
+ return 1;
}
/*
- * Called from scheduler to add the counters of the current task
- * with interrupts disabled.
- *
- * We restore the counter value and then enable it.
- *
- * This does not protect us against NMI, but enable()
- * sets the enabled bit in the control field of counter _before_
- * accessing the counter control register. If a NMI hits, then it will
- * keep the counter running.
+ * Work out whether we can put this counter group on the CPU now.
*/
-void perf_counter_task_sched_in(struct task_struct *task, int cpu)
+static int group_can_go_on(struct perf_counter *counter,
+ struct perf_cpu_context *cpuctx,
+ int can_add_hw)
{
- struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
- struct perf_counter_context *ctx = &task->perf_counter_ctx;
-
- __perf_counter_sched_in(ctx, cpuctx, cpu);
- cpuctx->task_ctx = ctx;
+ /*
+ * Groups consisting entirely of software counters can always go on.
+ */
+ if (is_software_only_group(counter))
+ return 1;
+ /*
+ * If an exclusive group is already on, no other hardware
+ * counters can go on.
+ */
+ if (cpuctx->exclusive)
+ return 0;
+ /*
+ * If this group is exclusive and there are already
+ * counters on the CPU, it can't go on.
+ */
+ if (counter->attr.exclusive && cpuctx->active_oncpu)
+ return 0;
+ /*
+ * Otherwise, try to add it if all previous groups were able
+ * to go on.
+ */
+ return can_add_hw;
}
-static void perf_counter_cpu_sched_in(struct perf_cpu_context *cpuctx, int cpu)
+static void add_counter_to_ctx(struct perf_counter *counter,
+ struct perf_counter_context *ctx)
{
- struct perf_counter_context *ctx = &cpuctx->ctx;
-
- __perf_counter_sched_in(ctx, cpuctx, cpu);
+ list_add_counter(counter, ctx);
+ counter->tstamp_enabled = ctx->time;
+ counter->tstamp_running = ctx->time;
+ counter->tstamp_stopped = ctx->time;
}
-int perf_counter_task_disable(void)
+/*
+ * Cross CPU call to install and enable a performance counter
+ *
+ * Must be called with ctx->mutex held
+ */
+static void __perf_install_in_context(void *info)
{
- struct task_struct *curr = current;
- struct perf_counter_context *ctx = &curr->perf_counter_ctx;
- struct perf_counter *counter;
- unsigned long flags;
- u64 perf_flags;
- int cpu;
-
- if (likely(!ctx->nr_counters))
- return 0;
+ struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+ struct perf_counter *counter = info;
+ struct perf_counter_context *ctx = counter->ctx;
+ struct perf_counter *leader = counter->group_leader;
+ int cpu = smp_processor_id();
+ int err;
- curr_rq_lock_irq_save(&flags);
- cpu = smp_processor_id();
+ /*
+ * If this is a task context, we need to check whether it is
+ * the current task context of this cpu. If not it has been
+ * scheduled out before the smp call arrived.
+ * Or possibly this is the right context but it isn't
+ * on this cpu because it had no counters.
+ */
+ if (ctx->task && cpuctx->task_ctx != ctx) {
+ if (cpuctx->task_ctx || ctx->task != current)
+ return;
+ cpuctx->task_ctx = ctx;
+ }
- /* force the update of the task clock: */
- __task_delta_exec(curr, 1);
+ spin_lock(&ctx->lock);
+ ctx->is_active = 1;
+ update_context_time(ctx);
- perf_counter_task_sched_out(curr, cpu);
+ /*
+ * Protect the list operation against NMI by disabling the
+ * counters on a global level. NOP for non NMI based counters.
+ */
+ perf_disable();
- spin_lock(&ctx->lock);
+ add_counter_to_ctx(counter, ctx);
/*
- * Disable all the counters:
+ * Don't put the counter on if it is disabled or if
+ * it is in a group and the group isn't on.
*/
- perf_flags = hw_perf_save_disable();
+ if (counter->state != PERF_COUNTER_STATE_INACTIVE ||
+ (leader != counter && leader->state != PERF_COUNTER_STATE_ACTIVE))
+ goto unlock;
- list_for_each_entry(counter, &ctx->counter_list, list_entry)
- counter->state = PERF_COUNTER_STATE_OFF;
+ /*
+ * An exclusive counter can't go on if there are already active
+ * hardware counters, and no hardware counter can go on if there
+ * is already an exclusive counter on.
+ */
+ if (!group_can_go_on(counter, cpuctx, 1))
+ err = -EEXIST;
+ else
+ err = counter_sched_in(counter, cpuctx, ctx, cpu);
- hw_perf_restore(perf_flags);
+ if (err) {
+ /*
+ * This counter couldn't go on. If it is in a group
+ * then we have to pull the whole group off.
+ * If the counter group is pinned then put it in error state.
+ */
+ if (leader != counter)
+ group_sched_out(leader, cpuctx, ctx);
+ if (leader->attr.pinned) {
+ update_group_times(leader);
+ leader->state = PERF_COUNTER_STATE_ERROR;
+ }
+ }
- spin_unlock(&ctx->lock);
+ if (!err && !ctx->task && cpuctx->max_pertask)
+ cpuctx->max_pertask--;
- curr_rq_unlock_irq_restore(&flags);
+ unlock:
+ perf_enable();
- return 0;
+ spin_unlock(&ctx->lock);
}
-int perf_counter_task_enable(void)
+/*
+ * Attach a performance counter to a context
+ *
+ * First we add the counter to the list with the hardware enable bit
+ * in counter->hw_config cleared.
+ *
+ * If the counter is attached to a task which is on a CPU we use a smp
+ * call to enable it in the task context. The task might have been
+ * scheduled away, but we check this in the smp call again.
+ *
+ * Must be called with ctx->mutex held.
+ */
+static void
+perf_install_in_context(struct perf_counter_context *ctx,
+ struct perf_counter *counter,
+ int cpu)
{
- struct task_struct *curr = current;
- struct perf_counter_context *ctx = &curr->perf_counter_ctx;
- struct perf_counter *counter;
- unsigned long flags;
- u64 perf_flags;
- int cpu;
-
- if (likely(!ctx->nr_counters))
- return 0;
-
- curr_rq_lock_irq_save(&flags);
- cpu = smp_processor_id();
-
- /* force the update of the task clock: */
- __task_delta_exec(curr, 1);
+ struct task_struct *task = ctx->task;
- perf_counter_task_sched_out(curr, cpu);
+ if (!task) {
+ /*
+ * Per cpu counters are installed via an smp call and
+ * the install is always sucessful.
+ */
+ smp_call_function_single(cpu, __perf_install_in_context,
+ counter, 1);
+ return;
+ }
- spin_lock(&ctx->lock);
+retry:
+ task_oncpu_function_call(task, __perf_install_in_context,
+ counter);
+ spin_lock_irq(&ctx->lock);
/*
- * Disable all the counters:
+ * we need to retry the smp call.
*/
- perf_flags = hw_perf_save_disable();
-
- list_for_each_entry(counter, &ctx->counter_list, list_entry) {
- if (counter->state != PERF_COUNTER_STATE_OFF)
- continue;
- counter->state = PERF_COUNTER_STATE_INACTIVE;
- counter->hw_event.disabled = 0;
+ if (ctx->is_active && list_empty(&counter->list_entry)) {
+ spin_unlock_irq(&ctx->lock);
+ goto retry;
}
- hw_perf_restore(perf_flags);
-
- spin_unlock(&ctx->lock);
- perf_counter_task_sched_in(curr, cpu);
-
- curr_rq_unlock_irq_restore(&flags);
-
- return 0;
+ /*
+ * The lock prevents that this context is scheduled in so we
+ * can add the counter safely, if it the call above did not
+ * succeed.
+ */
+ if (list_empty(&counter->list_entry))
+ add_counter_to_ctx(counter, ctx);
+ spin_unlock_irq(&ctx->lock);
}
/*
- * Round-robin a context's counters:
+ * Cross CPU call to enable a performance counter
*/
-static void rotate_ctx(struct perf_counter_context *ctx)
+static void __perf_counter_enable(void *info)
{
- struct perf_counter *counter;
- u64 perf_flags;
-
- if (!ctx->nr_counters)
- return;
+ struct perf_counter *counter = info;
+ struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+ struct perf_counter_context *ctx = counter->ctx;
+ struct perf_counter *leader = counter->group_leader;
+ int err;
- spin_lock(&ctx->lock);
/*
- * Rotate the first entry last (works just fine for group counters too):
+ * If this is a per-task counter, need to check whether this
+ * counter's task is the current task on this cpu.
*/
- perf_flags = hw_perf_save_disable();
- list_for_each_entry(counter, &ctx->counter_list, list_entry) {
- list_del(&counter->list_entry);
- list_add_tail(&counter->list_entry, &ctx->counter_list);
- break;
+ if (ctx->task && cpuctx->task_ctx != ctx) {
+ if (cpuctx->task_ctx || ctx->task != current)
+ return;
+ cpuctx->task_ctx = ctx;
}
- hw_perf_restore(perf_flags);
- spin_unlock(&ctx->lock);
-}
+ spin_lock(&ctx->lock);
+ ctx->is_active = 1;
+ update_context_time(ctx);
-void perf_counter_task_tick(struct task_struct *curr, int cpu)
-{
- struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
- struct perf_counter_context *ctx = &curr->perf_counter_ctx;
- const int rotate_percpu = 0;
+ if (counter->state >= PERF_COUNTER_STATE_INACTIVE)
+ goto unlock;
+ counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->tstamp_enabled = ctx->time - counter->total_time_enabled;
- if (rotate_percpu)
- perf_counter_cpu_sched_out(cpuctx);
- perf_counter_task_sched_out(curr, cpu);
+ /*
+ * If the counter is in a group and isn't the group leader,
+ * then don't put it on unless the group is on.
+ */
+ if (leader != counter && leader->state != PERF_COUNTER_STATE_ACTIVE)
+ goto unlock;
+
+ if (!group_can_go_on(counter, cpuctx, 1)) {
+ err = -EEXIST;
+ } else {
+ perf_disable();
+ if (counter == leader)
+ err = group_sched_in(counter, cpuctx, ctx,
+ smp_processor_id());
+ else
+ err = counter_sched_in(counter, cpuctx, ctx,
+ smp_processor_id());
+ perf_enable();
+ }
- if (rotate_percpu)
- rotate_ctx(&cpuctx->ctx);
- rotate_ctx(ctx);
+ if (err) {
+ /*
+ * If this counter can't go on and it's part of a
+ * group, then the whole group has to come off.
+ */
+ if (leader != counter)
+ group_sched_out(leader, cpuctx, ctx);
+ if (leader->attr.pinned) {
+ update_group_times(leader);
+ leader->state = PERF_COUNTER_STATE_ERROR;
+ }
+ }
- if (rotate_percpu)
- perf_counter_cpu_sched_in(cpuctx, cpu);
- perf_counter_task_sched_in(curr, cpu);
+ unlock:
+ spin_unlock(&ctx->lock);
}
/*
- * Cross CPU call to read the hardware counter
+ * Enable a counter.
+ *
+ * If counter->ctx is a cloned context, callers must make sure that
+ * every task struct that counter->ctx->task could possibly point to
+ * remains valid. This condition is satisfied when called through
+ * perf_counter_for_each_child or perf_counter_for_each as described
+ * for perf_counter_disable.
*/
-static void __read(void *info)
+static void perf_counter_enable(struct perf_counter *counter)
+{
+ struct perf_counter_context *ctx = counter->ctx;
+ struct task_struct *task = ctx->task;
+
+ if (!task) {
+ /*
+ * Enable the counter on the cpu that it's on
+ */
+ smp_call_function_single(counter->cpu, __perf_counter_enable,
+ counter, 1);
+ return;
+ }
+
+ spin_lock_irq(&ctx->lock);
+ if (counter->state >= PERF_COUNTER_STATE_INACTIVE)
+ goto out;
+
+ /*
+ * If the counter is in error state, clear that first.
+ * That way, if we see the counter in error state below, we
+ * know that it has gone back into error state, as distinct
+ * from the task having been scheduled away before the
+ * cross-call arrived.
+ */
+ if (counter->state == PERF_COUNTER_STATE_ERROR)
+ counter->state = PERF_COUNTER_STATE_OFF;
+
+ retry:
+ spin_unlock_irq(&ctx->lock);
+ task_oncpu_function_call(task, __perf_counter_enable, counter);
+
+ spin_lock_irq(&ctx->lock);
+
+ /*
+ * If the context is active and the counter is still off,
+ * we need to retry the cross-call.
+ */
+ if (ctx->is_active && counter->state == PERF_COUNTER_STATE_OFF)
+ goto retry;
+
+ /*
+ * Since we have the lock this context can't be scheduled
+ * in, so we can change the state safely.
+ */
+ if (counter->state == PERF_COUNTER_STATE_OFF) {
+ counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->tstamp_enabled =
+ ctx->time - counter->total_time_enabled;
+ }
+ out:
+ spin_unlock_irq(&ctx->lock);
+}
+
+static int perf_counter_refresh(struct perf_counter *counter, int refresh)
+{
+ /*
+ * not supported on inherited counters
+ */
+ if (counter->attr.inherit)
+ return -EINVAL;
+
+ atomic_add(refresh, &counter->event_limit);
+ perf_counter_enable(counter);
+
+ return 0;
+}
+
+void __perf_counter_sched_out(struct perf_counter_context *ctx,
+ struct perf_cpu_context *cpuctx)
+{
+ struct perf_counter *counter;
+
+ spin_lock(&ctx->lock);
+ ctx->is_active = 0;
+ if (likely(!ctx->nr_counters))
+ goto out;
+ update_context_time(ctx);
+
+ perf_disable();
+ if (ctx->nr_active) {
+ list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+ if (counter != counter->group_leader)
+ counter_sched_out(counter, cpuctx, ctx);
+ else
+ group_sched_out(counter, cpuctx, ctx);
+ }
+ }
+ perf_enable();
+ out:
+ spin_unlock(&ctx->lock);
+}
+
+/*
+ * Test whether two contexts are equivalent, i.e. whether they
+ * have both been cloned from the same version of the same context
+ * and they both have the same number of enabled counters.
+ * If the number of enabled counters is the same, then the set
+ * of enabled counters should be the same, because these are both
+ * inherited contexts, therefore we can't access individual counters
+ * in them directly with an fd; we can only enable/disable all
+ * counters via prctl, or enable/disable all counters in a family
+ * via ioctl, which will have the same effect on both contexts.
+ */
+static int context_equiv(struct perf_counter_context *ctx1,
+ struct perf_counter_context *ctx2)
+{
+ return ctx1->parent_ctx && ctx1->parent_ctx == ctx2->parent_ctx
+ && ctx1->parent_gen == ctx2->parent_gen
+ && !ctx1->pin_count && !ctx2->pin_count;
+}
+
+static void __perf_counter_read(void *counter);
+
+static void __perf_counter_sync_stat(struct perf_counter *counter,
+ struct perf_counter *next_counter)
+{
+ u64 value;
+
+ if (!counter->attr.inherit_stat)
+ return;
+
+ /*
+ * Update the counter value, we cannot use perf_counter_read()
+ * because we're in the middle of a context switch and have IRQs
+ * disabled, which upsets smp_call_function_single(), however
+ * we know the counter must be on the current CPU, therefore we
+ * don't need to use it.
+ */
+ switch (counter->state) {
+ case PERF_COUNTER_STATE_ACTIVE:
+ __perf_counter_read(counter);
+ break;
+
+ case PERF_COUNTER_STATE_INACTIVE:
+ update_counter_times(counter);
+ break;
+
+ default:
+ break;
+ }
+
+ /*
+ * In order to keep per-task stats reliable we need to flip the counter
+ * values when we flip the contexts.
+ */
+ value = atomic64_read(&next_counter->count);
+ value = atomic64_xchg(&counter->count, value);
+ atomic64_set(&next_counter->count, value);
+
+ swap(counter->total_time_enabled, next_counter->total_time_enabled);
+ swap(counter->total_time_running, next_counter->total_time_running);
+
+ /*
+ * Since we swizzled the values, update the user visible data too.
+ */
+ perf_counter_update_userpage(counter);
+ perf_counter_update_userpage(next_counter);
+}
+
+#define list_next_entry(pos, member) \
+ list_entry(pos->member.next, typeof(*pos), member)
+
+static void perf_counter_sync_stat(struct perf_counter_context *ctx,
+ struct perf_counter_context *next_ctx)
+{
+ struct perf_counter *counter, *next_counter;
+
+ if (!ctx->nr_stat)
+ return;
+
+ counter = list_first_entry(&ctx->event_list,
+ struct perf_counter, event_entry);
+
+ next_counter = list_first_entry(&next_ctx->event_list,
+ struct perf_counter, event_entry);
+
+ while (&counter->event_entry != &ctx->event_list &&
+ &next_counter->event_entry != &next_ctx->event_list) {
+
+ __perf_counter_sync_stat(counter, next_counter);
+
+ counter = list_next_entry(counter, event_entry);
+ next_counter = list_next_entry(counter, event_entry);
+ }
+}
+
+/*
+ * Called from scheduler to remove the counters of the current task,
+ * with interrupts disabled.
+ *
+ * We stop each counter and update the counter value in counter->count.
+ *
+ * This does not protect us against NMI, but disable()
+ * sets the disabled bit in the control field of counter _before_
+ * accessing the counter control register. If a NMI hits, then it will
+ * not restart the counter.
+ */
+void perf_counter_task_sched_out(struct task_struct *task,
+ struct task_struct *next, int cpu)
+{
+ struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+ struct perf_counter_context *ctx = task->perf_counter_ctxp;
+ struct perf_counter_context *next_ctx;
+ struct perf_counter_context *parent;
+ struct pt_regs *regs;
+ int do_switch = 1;
+
+ regs = task_pt_regs(task);
+ perf_swcounter_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, regs, 0);
+
+ if (likely(!ctx || !cpuctx->task_ctx))
+ return;
+
+ update_context_time(ctx);
+
+ rcu_read_lock();
+ parent = rcu_dereference(ctx->parent_ctx);
+ next_ctx = next->perf_counter_ctxp;
+ if (parent && next_ctx &&
+ rcu_dereference(next_ctx->parent_ctx) == parent) {
+ /*
+ * Looks like the two contexts are clones, so we might be
+ * able to optimize the context switch. We lock both
+ * contexts and check that they are clones under the
+ * lock (including re-checking that neither has been
+ * uncloned in the meantime). It doesn't matter which
+ * order we take the locks because no other cpu could
+ * be trying to lock both of these tasks.
+ */
+ spin_lock(&ctx->lock);
+ spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING);
+ if (context_equiv(ctx, next_ctx)) {
+ /*
+ * XXX do we need a memory barrier of sorts
+ * wrt to rcu_dereference() of perf_counter_ctxp
+ */
+ task->perf_counter_ctxp = next_ctx;
+ next->perf_counter_ctxp = ctx;
+ ctx->task = next;
+ next_ctx->task = task;
+ do_switch = 0;
+
+ perf_counter_sync_stat(ctx, next_ctx);
+ }
+ spin_unlock(&next_ctx->lock);
+ spin_unlock(&ctx->lock);
+ }
+ rcu_read_unlock();
+
+ if (do_switch) {
+ __perf_counter_sched_out(ctx, cpuctx);
+ cpuctx->task_ctx = NULL;
+ }
+}
+
+/*
+ * Called with IRQs disabled
+ */
+static void __perf_counter_task_sched_out(struct perf_counter_context *ctx)
+{
+ struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+
+ if (!cpuctx->task_ctx)
+ return;
+
+ if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
+ return;
+
+ __perf_counter_sched_out(ctx, cpuctx);
+ cpuctx->task_ctx = NULL;
+}
+
+/*
+ * Called with IRQs disabled
+ */
+static void perf_counter_cpu_sched_out(struct perf_cpu_context *cpuctx)
+{
+ __perf_counter_sched_out(&cpuctx->ctx, cpuctx);
+}
+
+static void
+__perf_counter_sched_in(struct perf_counter_context *ctx,
+ struct perf_cpu_context *cpuctx, int cpu)
+{
+ struct perf_counter *counter;
+ int can_add_hw = 1;
+
+ spin_lock(&ctx->lock);
+ ctx->is_active = 1;
+ if (likely(!ctx->nr_counters))
+ goto out;
+
+ ctx->timestamp = perf_clock();
+
+ perf_disable();
+
+ /*
+ * First go through the list and put on any pinned groups
+ * in order to give them the best chance of going on.
+ */
+ list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+ if (counter->state <= PERF_COUNTER_STATE_OFF ||
+ !counter->attr.pinned)
+ continue;
+ if (counter->cpu != -1 && counter->cpu != cpu)
+ continue;
+
+ if (counter != counter->group_leader)
+ counter_sched_in(counter, cpuctx, ctx, cpu);
+ else {
+ if (group_can_go_on(counter, cpuctx, 1))
+ group_sched_in(counter, cpuctx, ctx, cpu);
+ }
+
+ /*
+ * If this pinned group hasn't been scheduled,
+ * put it in error state.
+ */
+ if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+ update_group_times(counter);
+ counter->state = PERF_COUNTER_STATE_ERROR;
+ }
+ }
+
+ list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+ /*
+ * Ignore counters in OFF or ERROR state, and
+ * ignore pinned counters since we did them already.
+ */
+ if (counter->state <= PERF_COUNTER_STATE_OFF ||
+ counter->attr.pinned)
+ continue;
+
+ /*
+ * Listen to the 'cpu' scheduling filter constraint
+ * of counters:
+ */
+ if (counter->cpu != -1 && counter->cpu != cpu)
+ continue;
+
+ if (counter != counter->group_leader) {
+ if (counter_sched_in(counter, cpuctx, ctx, cpu))
+ can_add_hw = 0;
+ } else {
+ if (group_can_go_on(counter, cpuctx, can_add_hw)) {
+ if (group_sched_in(counter, cpuctx, ctx, cpu))
+ can_add_hw = 0;
+ }
+ }
+ }
+ perf_enable();
+ out:
+ spin_unlock(&ctx->lock);
+}
+
+/*
+ * Called from scheduler to add the counters of the current task
+ * with interrupts disabled.
+ *
+ * We restore the counter value and then enable it.
+ *
+ * This does not protect us against NMI, but enable()
+ * sets the enabled bit in the control field of counter _before_
+ * accessing the counter control register. If a NMI hits, then it will
+ * keep the counter running.
+ */
+void perf_counter_task_sched_in(struct task_struct *task, int cpu)
+{
+ struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+ struct perf_counter_context *ctx = task->perf_counter_ctxp;
+
+ if (likely(!ctx))
+ return;
+ if (cpuctx->task_ctx == ctx)
+ return;
+ __perf_counter_sched_in(ctx, cpuctx, cpu);
+ cpuctx->task_ctx = ctx;
+}
+
+static void perf_counter_cpu_sched_in(struct perf_cpu_context *cpuctx, int cpu)
+{
+ struct perf_counter_context *ctx = &cpuctx->ctx;
+
+ __perf_counter_sched_in(ctx, cpuctx, cpu);
+}
+
+#define MAX_INTERRUPTS (~0ULL)
+
+static void perf_log_throttle(struct perf_counter *counter, int enable);
+
+static void perf_adjust_period(struct perf_counter *counter, u64 events)
+{
+ struct hw_perf_counter *hwc = &counter->hw;
+ u64 period, sample_period;
+ s64 delta;
+
+ events *= hwc->sample_period;
+ period = div64_u64(events, counter->attr.sample_freq);
+
+ delta = (s64)(period - hwc->sample_period);
+ delta = (delta + 7) / 8; /* low pass filter */
+
+ sample_period = hwc->sample_period + delta;
+
+ if (!sample_period)
+ sample_period = 1;
+
+ hwc->sample_period = sample_period;
+}
+
+static void perf_ctx_adjust_freq(struct perf_counter_context *ctx)
+{
+ struct perf_counter *counter;
+ struct hw_perf_counter *hwc;
+ u64 interrupts, freq;
+
+ spin_lock(&ctx->lock);
+ list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+ if (counter->state != PERF_COUNTER_STATE_ACTIVE)
+ continue;
+
+ hwc = &counter->hw;
+
+ interrupts = hwc->interrupts;
+ hwc->interrupts = 0;
+
+ /*
+ * unthrottle counters on the tick
+ */
+ if (interrupts == MAX_INTERRUPTS) {
+ perf_log_throttle(counter, 1);
+ counter->pmu->unthrottle(counter);
+ interrupts = 2*sysctl_perf_counter_sample_rate/HZ;
+ }
+
+ if (!counter->attr.freq || !counter->attr.sample_freq)
+ continue;
+
+ /*
+ * if the specified freq < HZ then we need to skip ticks
+ */
+ if (counter->attr.sample_freq < HZ) {
+ freq = counter->attr.sample_freq;
+
+ hwc->freq_count += freq;
+ hwc->freq_interrupts += interrupts;
+
+ if (hwc->freq_count < HZ)
+ continue;
+
+ interrupts = hwc->freq_interrupts;
+ hwc->freq_interrupts = 0;
+ hwc->freq_count -= HZ;
+ } else
+ freq = HZ;
+
+ perf_adjust_period(counter, freq * interrupts);
+
+ /*
+ * In order to avoid being stalled by an (accidental) huge
+ * sample period, force reset the sample period if we didn't
+ * get any events in this freq period.
+ */
+ if (!interrupts) {
+ perf_disable();
+ counter->pmu->disable(counter);
+ atomic64_set(&hwc->period_left, 0);
+ counter->pmu->enable(counter);
+ perf_enable();
+ }
+ }
+ spin_unlock(&ctx->lock);
+}
+
+/*
+ * Round-robin a context's counters:
+ */
+static void rotate_ctx(struct perf_counter_context *ctx)
+{
+ struct perf_counter *counter;
+
+ if (!ctx->nr_counters)
+ return;
+
+ spin_lock(&ctx->lock);
+ /*
+ * Rotate the first entry last (works just fine for group counters too):
+ */
+ perf_disable();
+ list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+ list_move_tail(&counter->list_entry, &ctx->counter_list);
+ break;
+ }
+ perf_enable();
+
+ spin_unlock(&ctx->lock);
+}
+
+void perf_counter_task_tick(struct task_struct *curr, int cpu)
+{
+ struct perf_cpu_context *cpuctx;
+ struct perf_counter_context *ctx;
+
+ if (!atomic_read(&nr_counters))
+ return;
+
+ cpuctx = &per_cpu(perf_cpu_context, cpu);
+ ctx = curr->perf_counter_ctxp;
+
+ perf_ctx_adjust_freq(&cpuctx->ctx);
+ if (ctx)
+ perf_ctx_adjust_freq(ctx);
+
+ perf_counter_cpu_sched_out(cpuctx);
+ if (ctx)
+ __perf_counter_task_sched_out(ctx);
+
+ rotate_ctx(&cpuctx->ctx);
+ if (ctx)
+ rotate_ctx(ctx);
+
+ perf_counter_cpu_sched_in(cpuctx, cpu);
+ if (ctx)
+ perf_counter_task_sched_in(curr, cpu);
+}
+
+/*
+ * Enable all of a task's counters that have been marked enable-on-exec.
+ * This expects task == current.
+ */
+static void perf_counter_enable_on_exec(struct task_struct *task)
+{
+ struct perf_counter_context *ctx;
+ struct perf_counter *counter;
+ unsigned long flags;
+ int enabled = 0;
+
+ local_irq_save(flags);
+ ctx = task->perf_counter_ctxp;
+ if (!ctx || !ctx->nr_counters)
+ goto out;
+
+ __perf_counter_task_sched_out(ctx);
+
+ spin_lock(&ctx->lock);
+
+ list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+ if (!counter->attr.enable_on_exec)
+ continue;
+ counter->attr.enable_on_exec = 0;
+ if (counter->state >= PERF_COUNTER_STATE_INACTIVE)
+ continue;
+ counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->tstamp_enabled =
+ ctx->time - counter->total_time_enabled;
+ enabled = 1;
+ }
+
+ /*
+ * Unclone this context if we enabled any counter.
+ */
+ if (enabled)
+ unclone_ctx(ctx);
+
+ spin_unlock(&ctx->lock);
+
+ perf_counter_task_sched_in(task, smp_processor_id());
+ out:
+ local_irq_restore(flags);
+}
+
+/*
+ * Cross CPU call to read the hardware counter
+ */
+static void __perf_counter_read(void *info)
{
struct perf_counter *counter = info;
+ struct perf_counter_context *ctx = counter->ctx;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ if (ctx->is_active)
+ update_context_time(ctx);
+ counter->pmu->read(counter);
+ update_counter_times(counter);
+ local_irq_restore(flags);
+}
+
+static u64 perf_counter_read(struct perf_counter *counter)
+{
+ /*
+ * If counter is enabled and currently active on a CPU, update the
+ * value in the counter structure:
+ */
+ if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
+ smp_call_function_single(counter->oncpu,
+ __perf_counter_read, counter, 1);
+ } else if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+ update_counter_times(counter);
+ }
+
+ return atomic64_read(&counter->count);
+}
+
+/*
+ * Initialize the perf_counter context in a task_struct:
+ */
+static void
+__perf_counter_init_context(struct perf_counter_context *ctx,
+ struct task_struct *task)
+{
+ memset(ctx, 0, sizeof(*ctx));
+ spin_lock_init(&ctx->lock);
+ mutex_init(&ctx->mutex);
+ INIT_LIST_HEAD(&ctx->counter_list);
+ INIT_LIST_HEAD(&ctx->event_list);
+ atomic_set(&ctx->refcount, 1);
+ ctx->task = task;
+}
+
+static struct perf_counter_context *find_get_context(pid_t pid, int cpu)
+{
+ struct perf_counter_context *ctx;
+ struct perf_cpu_context *cpuctx;
+ struct task_struct *task;
unsigned long flags;
+ int err;
+
+ /*
+ * If cpu is not a wildcard then this is a percpu counter:
+ */
+ if (cpu != -1) {
+ /* Must be root to operate on a CPU counter: */
+ if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
+ return ERR_PTR(-EACCES);
+
+ if (cpu < 0 || cpu > num_possible_cpus())
+ return ERR_PTR(-EINVAL);
+
+ /*
+ * We could be clever and allow to attach a counter to an
+ * offline CPU and activate it when the CPU comes up, but
+ * that's for later.
+ */
+ if (!cpu_isset(cpu, cpu_online_map))
+ return ERR_PTR(-ENODEV);
+
+ cpuctx = &per_cpu(perf_cpu_context, cpu);
+ ctx = &cpuctx->ctx;
+ get_ctx(ctx);
+
+ return ctx;
+ }
+
+ rcu_read_lock();
+ if (!pid)
+ task = current;
+ else
+ task = find_task_by_vpid(pid);
+ if (task)
+ get_task_struct(task);
+ rcu_read_unlock();
+
+ if (!task)
+ return ERR_PTR(-ESRCH);
+
+ /*
+ * Can't attach counters to a dying task.
+ */
+ err = -ESRCH;
+ if (task->flags & PF_EXITING)
+ goto errout;
+
+ /* Reuse ptrace permission checks for now. */
+ err = -EACCES;
+ if (!ptrace_may_access(task, PTRACE_MODE_READ))
+ goto errout;
+
+ retry:
+ ctx = perf_lock_task_context(task, &flags);
+ if (ctx) {
+ unclone_ctx(ctx);
+ spin_unlock_irqrestore(&ctx->lock, flags);
+ }
+
+ if (!ctx) {
+ ctx = kmalloc(sizeof(struct perf_counter_context), GFP_KERNEL);
+ err = -ENOMEM;
+ if (!ctx)
+ goto errout;
+ __perf_counter_init_context(ctx, task);
+ get_ctx(ctx);
+ if (cmpxchg(&task->perf_counter_ctxp, NULL, ctx)) {
+ /*
+ * We raced with some other task; use
+ * the context they set.
+ */
+ kfree(ctx);
+ goto retry;
+ }
+ get_task_struct(task);
+ }
+
+ put_task_struct(task);
+ return ctx;
+
+ errout:
+ put_task_struct(task);
+ return ERR_PTR(err);
+}
+
+static void free_counter_rcu(struct rcu_head *head)
+{
+ struct perf_counter *counter;
+
+ counter = container_of(head, struct perf_counter, rcu_head);
+ if (counter->ns)
+ put_pid_ns(counter->ns);
+ kfree(counter);
+}
+
+static void perf_pending_sync(struct perf_counter *counter);
+
+static void free_counter(struct perf_counter *counter)
+{
+ perf_pending_sync(counter);
+
+ if (!counter->parent) {
+ atomic_dec(&nr_counters);
+ if (counter->attr.mmap)
+ atomic_dec(&nr_mmap_counters);
+ if (counter->attr.comm)
+ atomic_dec(&nr_comm_counters);
+ }
+
+ if (counter->destroy)
+ counter->destroy(counter);
+
+ put_ctx(counter->ctx);
+ call_rcu(&counter->rcu_head, free_counter_rcu);
+}
+
+/*
+ * Called when the last reference to the file is gone.
+ */
+static int perf_release(struct inode *inode, struct file *file)
+{
+ struct perf_counter *counter = file->private_data;
+ struct perf_counter_context *ctx = counter->ctx;
+
+ file->private_data = NULL;
+
+ WARN_ON_ONCE(ctx->parent_ctx);
+ mutex_lock(&ctx->mutex);
+ perf_counter_remove_from_context(counter);
+ mutex_unlock(&ctx->mutex);
+
+ mutex_lock(&counter->owner->perf_counter_mutex);
+ list_del_init(&counter->owner_entry);
+ mutex_unlock(&counter->owner->perf_counter_mutex);
+ put_task_struct(counter->owner);
+
+ free_counter(counter);
+
+ return 0;
+}
+
+/*
+ * Read the performance counter - simple non blocking version for now
+ */
+static ssize_t
+perf_read_hw(struct perf_counter *counter, char __user *buf, size_t count)
+{
+ u64 values[4];
+ int n;
+
+ /*
+ * Return end-of-file for a read on a counter that is in
+ * error state (i.e. because it was pinned but it couldn't be
+ * scheduled on to the CPU at some point).
+ */
+ if (counter->state == PERF_COUNTER_STATE_ERROR)
+ return 0;
+
+ WARN_ON_ONCE(counter->ctx->parent_ctx);
+ mutex_lock(&counter->child_mutex);
+ values[0] = perf_counter_read(counter);
+ n = 1;
+ if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ values[n++] = counter->total_time_enabled +
+ atomic64_read(&counter->child_total_time_enabled);
+ if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ values[n++] = counter->total_time_running +
+ atomic64_read(&counter->child_total_time_running);
+ if (counter->attr.read_format & PERF_FORMAT_ID)
+ values[n++] = primary_counter_id(counter);
+ mutex_unlock(&counter->child_mutex);
+
+ if (count < n * sizeof(u64))
+ return -EINVAL;
+ count = n * sizeof(u64);
+
+ if (copy_to_user(buf, values, count))
+ return -EFAULT;
+
+ return count;
+}
+
+static ssize_t
+perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+ struct perf_counter *counter = file->private_data;
+
+ return perf_read_hw(counter, buf, count);
+}
+
+static unsigned int perf_poll(struct file *file, poll_table *wait)
+{
+ struct perf_counter *counter = file->private_data;
+ struct perf_mmap_data *data;
+ unsigned int events = POLL_HUP;
+
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (data)
+ events = atomic_xchg(&data->poll, 0);
+ rcu_read_unlock();
+
+ poll_wait(file, &counter->waitq, wait);
+
+ return events;
+}
+
+static void perf_counter_reset(struct perf_counter *counter)
+{
+ (void)perf_counter_read(counter);
+ atomic64_set(&counter->count, 0);
+ perf_counter_update_userpage(counter);
+}
+
+/*
+ * Holding the top-level counter's child_mutex means that any
+ * descendant process that has inherited this counter will block
+ * in sync_child_counter if it goes to exit, thus satisfying the
+ * task existence requirements of perf_counter_enable/disable.
+ */
+static void perf_counter_for_each_child(struct perf_counter *counter,
+ void (*func)(struct perf_counter *))
+{
+ struct perf_counter *child;
+
+ WARN_ON_ONCE(counter->ctx->parent_ctx);
+ mutex_lock(&counter->child_mutex);
+ func(counter);
+ list_for_each_entry(child, &counter->child_list, child_list)
+ func(child);
+ mutex_unlock(&counter->child_mutex);
+}
+
+static void perf_counter_for_each(struct perf_counter *counter,
+ void (*func)(struct perf_counter *))
+{
+ struct perf_counter_context *ctx = counter->ctx;
+ struct perf_counter *sibling;
+
+ WARN_ON_ONCE(ctx->parent_ctx);
+ mutex_lock(&ctx->mutex);
+ counter = counter->group_leader;
+
+ perf_counter_for_each_child(counter, func);
+ func(counter);
+ list_for_each_entry(sibling, &counter->sibling_list, list_entry)
+ perf_counter_for_each_child(counter, func);
+ mutex_unlock(&ctx->mutex);
+}
+
+static int perf_counter_period(struct perf_counter *counter, u64 __user *arg)
+{
+ struct perf_counter_context *ctx = counter->ctx;
+ unsigned long size;
+ int ret = 0;
+ u64 value;
+
+ if (!counter->attr.sample_period)
+ return -EINVAL;
+
+ size = copy_from_user(&value, arg, sizeof(value));
+ if (size != sizeof(value))
+ return -EFAULT;
+
+ if (!value)
+ return -EINVAL;
+
+ spin_lock_irq(&ctx->lock);
+ if (counter->attr.freq) {
+ if (value > sysctl_perf_counter_sample_rate) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ counter->attr.sample_freq = value;
+ } else {
+ counter->attr.sample_period = value;
+ counter->hw.sample_period = value;
+ }
+unlock:
+ spin_unlock_irq(&ctx->lock);
+
+ return ret;
+}
+
+static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct perf_counter *counter = file->private_data;
+ void (*func)(struct perf_counter *);
+ u32 flags = arg;
+
+ switch (cmd) {
+ case PERF_COUNTER_IOC_ENABLE:
+ func = perf_counter_enable;
+ break;
+ case PERF_COUNTER_IOC_DISABLE:
+ func = perf_counter_disable;
+ break;
+ case PERF_COUNTER_IOC_RESET:
+ func = perf_counter_reset;
+ break;
+
+ case PERF_COUNTER_IOC_REFRESH:
+ return perf_counter_refresh(counter, arg);
+
+ case PERF_COUNTER_IOC_PERIOD:
+ return perf_counter_period(counter, (u64 __user *)arg);
+
+ default:
+ return -ENOTTY;
+ }
+
+ if (flags & PERF_IOC_FLAG_GROUP)
+ perf_counter_for_each(counter, func);
+ else
+ perf_counter_for_each_child(counter, func);
+
+ return 0;
+}
+
+int perf_counter_task_enable(void)
+{
+ struct perf_counter *counter;
+
+ mutex_lock(¤t->perf_counter_mutex);
+ list_for_each_entry(counter, ¤t->perf_counter_list, owner_entry)
+ perf_counter_for_each_child(counter, perf_counter_enable);
+ mutex_unlock(¤t->perf_counter_mutex);
+
+ return 0;
+}
+
+int perf_counter_task_disable(void)
+{
+ struct perf_counter *counter;
+
+ mutex_lock(¤t->perf_counter_mutex);
+ list_for_each_entry(counter, ¤t->perf_counter_list, owner_entry)
+ perf_counter_for_each_child(counter, perf_counter_disable);
+ mutex_unlock(¤t->perf_counter_mutex);
+
+ return 0;
+}
+
+static int perf_counter_index(struct perf_counter *counter)
+{
+ if (counter->state != PERF_COUNTER_STATE_ACTIVE)
+ return 0;
+
+ return counter->hw.idx + 1 - PERF_COUNTER_INDEX_OFFSET;
+}
+
+/*
+ * Callers need to ensure there can be no nesting of this function, otherwise
+ * the seqlock logic goes bad. We can not serialize this because the arch
+ * code calls this from NMI context.
+ */
+void perf_counter_update_userpage(struct perf_counter *counter)
+{
+ struct perf_counter_mmap_page *userpg;
+ struct perf_mmap_data *data;
+
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (!data)
+ goto unlock;
+
+ userpg = data->user_page;
+
+ /*
+ * Disable preemption so as to not let the corresponding user-space
+ * spin too long if we get preempted.
+ */
+ preempt_disable();
+ ++userpg->lock;
+ barrier();
+ userpg->index = perf_counter_index(counter);
+ userpg->offset = atomic64_read(&counter->count);
+ if (counter->state == PERF_COUNTER_STATE_ACTIVE)
+ userpg->offset -= atomic64_read(&counter->hw.prev_count);
+
+ userpg->time_enabled = counter->total_time_enabled +
+ atomic64_read(&counter->child_total_time_enabled);
+
+ userpg->time_running = counter->total_time_running +
+ atomic64_read(&counter->child_total_time_running);
+
+ barrier();
+ ++userpg->lock;
+ preempt_enable();
+unlock:
+ rcu_read_unlock();
+}
+
+static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct perf_counter *counter = vma->vm_file->private_data;
+ struct perf_mmap_data *data;
+ int ret = VM_FAULT_SIGBUS;
+
+ if (vmf->flags & FAULT_FLAG_MKWRITE) {
+ if (vmf->pgoff == 0)
+ ret = 0;
+ return ret;
+ }
+
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (!data)
+ goto unlock;
+
+ if (vmf->pgoff == 0) {
+ vmf->page = virt_to_page(data->user_page);
+ } else {
+ int nr = vmf->pgoff - 1;
+
+ if ((unsigned)nr > data->nr_pages)
+ goto unlock;
+
+ if (vmf->flags & FAULT_FLAG_WRITE)
+ goto unlock;
+
+ vmf->page = virt_to_page(data->data_pages[nr]);
+ }
+
+ get_page(vmf->page);
+ vmf->page->mapping = vma->vm_file->f_mapping;
+ vmf->page->index = vmf->pgoff;
+
+ ret = 0;
+unlock:
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static int perf_mmap_data_alloc(struct perf_counter *counter, int nr_pages)
+{
+ struct perf_mmap_data *data;
+ unsigned long size;
+ int i;
+
+ WARN_ON(atomic_read(&counter->mmap_count));
+
+ size = sizeof(struct perf_mmap_data);
+ size += nr_pages * sizeof(void *);
+
+ data = kzalloc(size, GFP_KERNEL);
+ if (!data)
+ goto fail;
+
+ data->user_page = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!data->user_page)
+ goto fail_user_page;
+
+ for (i = 0; i < nr_pages; i++) {
+ data->data_pages[i] = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!data->data_pages[i])
+ goto fail_data_pages;
+ }
+
+ data->nr_pages = nr_pages;
+ atomic_set(&data->lock, -1);
+
+ rcu_assign_pointer(counter->data, data);
+
+ return 0;
+
+fail_data_pages:
+ for (i--; i >= 0; i--)
+ free_page((unsigned long)data->data_pages[i]);
+
+ free_page((unsigned long)data->user_page);
+
+fail_user_page:
+ kfree(data);
+
+fail:
+ return -ENOMEM;
+}
+
+static void perf_mmap_free_page(unsigned long addr)
+{
+ struct page *page = virt_to_page((void *)addr);
+
+ page->mapping = NULL;
+ __free_page(page);
+}
+
+static void __perf_mmap_data_free(struct rcu_head *rcu_head)
+{
+ struct perf_mmap_data *data;
+ int i;
+
+ data = container_of(rcu_head, struct perf_mmap_data, rcu_head);
+
+ perf_mmap_free_page((unsigned long)data->user_page);
+ for (i = 0; i < data->nr_pages; i++)
+ perf_mmap_free_page((unsigned long)data->data_pages[i]);
+
+ kfree(data);
+}
+
+static void perf_mmap_data_free(struct perf_counter *counter)
+{
+ struct perf_mmap_data *data = counter->data;
+
+ WARN_ON(atomic_read(&counter->mmap_count));
+
+ rcu_assign_pointer(counter->data, NULL);
+ call_rcu(&data->rcu_head, __perf_mmap_data_free);
+}
+
+static void perf_mmap_open(struct vm_area_struct *vma)
+{
+ struct perf_counter *counter = vma->vm_file->private_data;
+
+ atomic_inc(&counter->mmap_count);
+}
+
+static void perf_mmap_close(struct vm_area_struct *vma)
+{
+ struct perf_counter *counter = vma->vm_file->private_data;
+
+ WARN_ON_ONCE(counter->ctx->parent_ctx);
+ if (atomic_dec_and_mutex_lock(&counter->mmap_count, &counter->mmap_mutex)) {
+ struct user_struct *user = current_user();
+
+ atomic_long_sub(counter->data->nr_pages + 1, &user->locked_vm);
+ vma->vm_mm->locked_vm -= counter->data->nr_locked;
+ perf_mmap_data_free(counter);
+ mutex_unlock(&counter->mmap_mutex);
+ }
+}
+
+static struct vm_operations_struct perf_mmap_vmops = {
+ .open = perf_mmap_open,
+ .close = perf_mmap_close,
+ .fault = perf_mmap_fault,
+ .page_mkwrite = perf_mmap_fault,
+};
+
+static int perf_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct perf_counter *counter = file->private_data;
+ unsigned long user_locked, user_lock_limit;
+ struct user_struct *user = current_user();
+ unsigned long locked, lock_limit;
+ unsigned long vma_size;
+ unsigned long nr_pages;
+ long user_extra, extra;
+ int ret = 0;
+
+ if (!(vma->vm_flags & VM_SHARED))
+ return -EINVAL;
+
+ vma_size = vma->vm_end - vma->vm_start;
+ nr_pages = (vma_size / PAGE_SIZE) - 1;
+
+ /*
+ * If we have data pages ensure they're a power-of-two number, so we
+ * can do bitmasks instead of modulo.
+ */
+ if (nr_pages != 0 && !is_power_of_2(nr_pages))
+ return -EINVAL;
+
+ if (vma_size != PAGE_SIZE * (1 + nr_pages))
+ return -EINVAL;
+
+ if (vma->vm_pgoff != 0)
+ return -EINVAL;
+
+ WARN_ON_ONCE(counter->ctx->parent_ctx);
+ mutex_lock(&counter->mmap_mutex);
+ if (atomic_inc_not_zero(&counter->mmap_count)) {
+ if (nr_pages != counter->data->nr_pages)
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ user_extra = nr_pages + 1;
+ user_lock_limit = sysctl_perf_counter_mlock >> (PAGE_SHIFT - 10);
+
+ /*
+ * Increase the limit linearly with more CPUs:
+ */
+ user_lock_limit *= num_online_cpus();
+
+ user_locked = atomic_long_read(&user->locked_vm) + user_extra;
+
+ extra = 0;
+ if (user_locked > user_lock_limit)
+ extra = user_locked - user_lock_limit;
+
+ lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
+ lock_limit >>= PAGE_SHIFT;
+ locked = vma->vm_mm->locked_vm + extra;
+
+ if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
+ ret = -EPERM;
+ goto unlock;
+ }
+
+ WARN_ON(counter->data);
+ ret = perf_mmap_data_alloc(counter, nr_pages);
+ if (ret)
+ goto unlock;
+
+ atomic_set(&counter->mmap_count, 1);
+ atomic_long_add(user_extra, &user->locked_vm);
+ vma->vm_mm->locked_vm += extra;
+ counter->data->nr_locked = extra;
+ if (vma->vm_flags & VM_WRITE)
+ counter->data->writable = 1;
+
+unlock:
+ mutex_unlock(&counter->mmap_mutex);
+
+ vma->vm_flags |= VM_RESERVED;
+ vma->vm_ops = &perf_mmap_vmops;
+
+ return ret;
+}
+
+static int perf_fasync(int fd, struct file *filp, int on)
+{
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct perf_counter *counter = filp->private_data;
+ int retval;
+
+ mutex_lock(&inode->i_mutex);
+ retval = fasync_helper(fd, filp, on, &counter->fasync);
+ mutex_unlock(&inode->i_mutex);
+
+ if (retval < 0)
+ return retval;
+
+ return 0;
+}
+
+static const struct file_operations perf_fops = {
+ .release = perf_release,
+ .read = perf_read,
+ .poll = perf_poll,
+ .unlocked_ioctl = perf_ioctl,
+ .compat_ioctl = perf_ioctl,
+ .mmap = perf_mmap,
+ .fasync = perf_fasync,
+};
+
+/*
+ * Perf counter wakeup
+ *
+ * If there's data, ensure we set the poll() state and publish everything
+ * to user-space before waking everybody up.
+ */
+
+void perf_counter_wakeup(struct perf_counter *counter)
+{
+ wake_up_all(&counter->waitq);
+
+ if (counter->pending_kill) {
+ kill_fasync(&counter->fasync, SIGIO, counter->pending_kill);
+ counter->pending_kill = 0;
+ }
+}
+
+/*
+ * Pending wakeups
+ *
+ * Handle the case where we need to wakeup up from NMI (or rq->lock) context.
+ *
+ * The NMI bit means we cannot possibly take locks. Therefore, maintain a
+ * single linked list and use cmpxchg() to add entries lockless.
+ */
+
+static void perf_pending_counter(struct perf_pending_entry *entry)
+{
+ struct perf_counter *counter = container_of(entry,
+ struct perf_counter, pending);
+
+ if (counter->pending_disable) {
+ counter->pending_disable = 0;
+ perf_counter_disable(counter);
+ }
+
+ if (counter->pending_wakeup) {
+ counter->pending_wakeup = 0;
+ perf_counter_wakeup(counter);
+ }
+}
+
+#define PENDING_TAIL ((struct perf_pending_entry *)-1UL)
+
+static DEFINE_PER_CPU(struct perf_pending_entry *, perf_pending_head) = {
+ PENDING_TAIL,
+};
+
+static void perf_pending_queue(struct perf_pending_entry *entry,
+ void (*func)(struct perf_pending_entry *))
+{
+ struct perf_pending_entry **head;
+
+ if (cmpxchg(&entry->next, NULL, PENDING_TAIL) != NULL)
+ return;
+
+ entry->func = func;
+
+ head = &get_cpu_var(perf_pending_head);
+
+ do {
+ entry->next = *head;
+ } while (cmpxchg(head, entry->next, entry) != entry->next);
+
+ set_perf_counter_pending();
+
+ put_cpu_var(perf_pending_head);
+}
+
+static int __perf_pending_run(void)
+{
+ struct perf_pending_entry *list;
+ int nr = 0;
+
+ list = xchg(&__get_cpu_var(perf_pending_head), PENDING_TAIL);
+ while (list != PENDING_TAIL) {
+ void (*func)(struct perf_pending_entry *);
+ struct perf_pending_entry *entry = list;
+
+ list = list->next;
+
+ func = entry->func;
+ entry->next = NULL;
+ /*
+ * Ensure we observe the unqueue before we issue the wakeup,
+ * so that we won't be waiting forever.
+ * -- see perf_not_pending().
+ */
+ smp_wmb();
+
+ func(entry);
+ nr++;
+ }
+
+ return nr;
+}
+
+static inline int perf_not_pending(struct perf_counter *counter)
+{
+ /*
+ * If we flush on whatever cpu we run, there is a chance we don't
+ * need to wait.
+ */
+ get_cpu();
+ __perf_pending_run();
+ put_cpu();
+
+ /*
+ * Ensure we see the proper queue state before going to sleep
+ * so that we do not miss the wakeup. -- see perf_pending_handle()
+ */
+ smp_rmb();
+ return counter->pending.next == NULL;
+}
+
+static void perf_pending_sync(struct perf_counter *counter)
+{
+ wait_event(counter->waitq, perf_not_pending(counter));
+}
+
+void perf_counter_do_pending(void)
+{
+ __perf_pending_run();
+}
+
+/*
+ * Callchain support -- arch specific
+ */
+
+__weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
+{
+ return NULL;
+}
+
+/*
+ * Output
+ */
+
+struct perf_output_handle {
+ struct perf_counter *counter;
+ struct perf_mmap_data *data;
+ unsigned long head;
+ unsigned long offset;
+ int nmi;
+ int sample;
+ int locked;
+ unsigned long flags;
+};
+
+static bool perf_output_space(struct perf_mmap_data *data,
+ unsigned int offset, unsigned int head)
+{
+ unsigned long tail;
+ unsigned long mask;
+
+ if (!data->writable)
+ return true;
+
+ mask = (data->nr_pages << PAGE_SHIFT) - 1;
+ /*
+ * Userspace could choose to issue a mb() before updating the tail
+ * pointer. So that all reads will be completed before the write is
+ * issued.
+ */
+ tail = ACCESS_ONCE(data->user_page->data_tail);
+ smp_rmb();
+
+ offset = (offset - tail) & mask;
+ head = (head - tail) & mask;
+
+ if ((int)(head - offset) < 0)
+ return false;
+
+ return true;
+}
+
+static void perf_output_wakeup(struct perf_output_handle *handle)
+{
+ atomic_set(&handle->data->poll, POLL_IN);
+
+ if (handle->nmi) {
+ handle->counter->pending_wakeup = 1;
+ perf_pending_queue(&handle->counter->pending,
+ perf_pending_counter);
+ } else
+ perf_counter_wakeup(handle->counter);
+}
+
+/*
+ * Curious locking construct.
+ *
+ * We need to ensure a later event doesn't publish a head when a former
+ * event isn't done writing. However since we need to deal with NMIs we
+ * cannot fully serialize things.
+ *
+ * What we do is serialize between CPUs so we only have to deal with NMI
+ * nesting on a single CPU.
+ *
+ * We only publish the head (and generate a wakeup) when the outer-most
+ * event completes.
+ */
+static void perf_output_lock(struct perf_output_handle *handle)
+{
+ struct perf_mmap_data *data = handle->data;
+ int cpu;
+
+ handle->locked = 0;
+
+ local_irq_save(handle->flags);
+ cpu = smp_processor_id();
+
+ if (in_nmi() && atomic_read(&data->lock) == cpu)
+ return;
+
+ while (atomic_cmpxchg(&data->lock, -1, cpu) != -1)
+ cpu_relax();
+
+ handle->locked = 1;
+}
+
+static void perf_output_unlock(struct perf_output_handle *handle)
+{
+ struct perf_mmap_data *data = handle->data;
+ unsigned long head;
+ int cpu;
+
+ data->done_head = data->head;
+
+ if (!handle->locked)
+ goto out;
+
+again:
+ /*
+ * The xchg implies a full barrier that ensures all writes are done
+ * before we publish the new head, matched by a rmb() in userspace when
+ * reading this position.
+ */
+ while ((head = atomic_long_xchg(&data->done_head, 0)))
+ data->user_page->data_head = head;
+
+ /*
+ * NMI can happen here, which means we can miss a done_head update.
+ */
+
+ cpu = atomic_xchg(&data->lock, -1);
+ WARN_ON_ONCE(cpu != smp_processor_id());
+
+ /*
+ * Therefore we have to validate we did not indeed do so.
+ */
+ if (unlikely(atomic_long_read(&data->done_head))) {
+ /*
+ * Since we had it locked, we can lock it again.
+ */
+ while (atomic_cmpxchg(&data->lock, -1, cpu) != -1)
+ cpu_relax();
+
+ goto again;
+ }
+
+ if (atomic_xchg(&data->wakeup, 0))
+ perf_output_wakeup(handle);
+out:
+ local_irq_restore(handle->flags);
+}
+
+static void perf_output_copy(struct perf_output_handle *handle,
+ const void *buf, unsigned int len)
+{
+ unsigned int pages_mask;
+ unsigned int offset;
+ unsigned int size;
+ void **pages;
+
+ offset = handle->offset;
+ pages_mask = handle->data->nr_pages - 1;
+ pages = handle->data->data_pages;
+
+ do {
+ unsigned int page_offset;
+ int nr;
+
+ nr = (offset >> PAGE_SHIFT) & pages_mask;
+ page_offset = offset & (PAGE_SIZE - 1);
+ size = min_t(unsigned int, PAGE_SIZE - page_offset, len);
+
+ memcpy(pages[nr] + page_offset, buf, size);
+
+ len -= size;
+ buf += size;
+ offset += size;
+ } while (len);
+
+ handle->offset = offset;
+
+ /*
+ * Check we didn't copy past our reservation window, taking the
+ * possible unsigned int wrap into account.
+ */
+ WARN_ON_ONCE(((long)(handle->head - handle->offset)) < 0);
+}
+
+#define perf_output_put(handle, x) \
+ perf_output_copy((handle), &(x), sizeof(x))
+
+static int perf_output_begin(struct perf_output_handle *handle,
+ struct perf_counter *counter, unsigned int size,
+ int nmi, int sample)
+{
+ struct perf_mmap_data *data;
+ unsigned int offset, head;
+ int have_lost;
+ struct {
+ struct perf_event_header header;
+ u64 id;
+ u64 lost;
+ } lost_event;
+
+ /*
+ * For inherited counters we send all the output towards the parent.
+ */
+ if (counter->parent)
+ counter = counter->parent;
+
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (!data)
+ goto out;
+
+ handle->data = data;
+ handle->counter = counter;
+ handle->nmi = nmi;
+ handle->sample = sample;
+
+ if (!data->nr_pages)
+ goto fail;
+
+ have_lost = atomic_read(&data->lost);
+ if (have_lost)
+ size += sizeof(lost_event);
+
+ perf_output_lock(handle);
+
+ do {
+ offset = head = atomic_long_read(&data->head);
+ head += size;
+ if (unlikely(!perf_output_space(data, offset, head)))
+ goto fail;
+ } while (atomic_long_cmpxchg(&data->head, offset, head) != offset);
+
+ handle->offset = offset;
+ handle->head = head;
+
+ if ((offset >> PAGE_SHIFT) != (head >> PAGE_SHIFT))
+ atomic_set(&data->wakeup, 1);
+
+ if (have_lost) {
+ lost_event.header.type = PERF_EVENT_LOST;
+ lost_event.header.misc = 0;
+ lost_event.header.size = sizeof(lost_event);
+ lost_event.id = counter->id;
+ lost_event.lost = atomic_xchg(&data->lost, 0);
+
+ perf_output_put(handle, lost_event);
+ }
+
+ return 0;
+
+fail:
+ atomic_inc(&data->lost);
+ perf_output_unlock(handle);
+out:
+ rcu_read_unlock();
+
+ return -ENOSPC;
+}
+
+static void perf_output_end(struct perf_output_handle *handle)
+{
+ struct perf_counter *counter = handle->counter;
+ struct perf_mmap_data *data = handle->data;
+
+ int wakeup_events = counter->attr.wakeup_events;
+
+ if (handle->sample && wakeup_events) {
+ int events = atomic_inc_return(&data->events);
+ if (events >= wakeup_events) {
+ atomic_sub(wakeup_events, &data->events);
+ atomic_set(&data->wakeup, 1);
+ }
+ }
+
+ perf_output_unlock(handle);
+ rcu_read_unlock();
+}
+
+static u32 perf_counter_pid(struct perf_counter *counter, struct task_struct *p)
+{
+ /*
+ * only top level counters have the pid namespace they were created in
+ */
+ if (counter->parent)
+ counter = counter->parent;
+
+ return task_tgid_nr_ns(p, counter->ns);
+}
+
+static u32 perf_counter_tid(struct perf_counter *counter, struct task_struct *p)
+{
+ /*
+ * only top level counters have the pid namespace they were created in
+ */
+ if (counter->parent)
+ counter = counter->parent;
+
+ return task_pid_nr_ns(p, counter->ns);
+}
+
+static void perf_counter_output(struct perf_counter *counter, int nmi,
+ struct perf_sample_data *data)
+{
+ int ret;
+ u64 sample_type = counter->attr.sample_type;
+ struct perf_output_handle handle;
+ struct perf_event_header header;
+ u64 ip;
+ struct {
+ u32 pid, tid;
+ } tid_entry;
+ struct {
+ u64 id;
+ u64 counter;
+ } group_entry;
+ struct perf_callchain_entry *callchain = NULL;
+ int callchain_size = 0;
+ u64 time;
+ struct {
+ u32 cpu, reserved;
+ } cpu_entry;
+
+ header.type = PERF_EVENT_SAMPLE;
+ header.size = sizeof(header);
+
+ header.misc = 0;
+ header.misc |= perf_misc_flags(data->regs);
+
+ if (sample_type & PERF_SAMPLE_IP) {
+ ip = perf_instruction_pointer(data->regs);
+ header.size += sizeof(ip);
+ }
+
+ if (sample_type & PERF_SAMPLE_TID) {
+ /* namespace issues */
+ tid_entry.pid = perf_counter_pid(counter, current);
+ tid_entry.tid = perf_counter_tid(counter, current);
+
+ header.size += sizeof(tid_entry);
+ }
+
+ if (sample_type & PERF_SAMPLE_TIME) {
+ /*
+ * Maybe do better on x86 and provide cpu_clock_nmi()
+ */
+ time = sched_clock();
+
+ header.size += sizeof(u64);
+ }
+
+ if (sample_type & PERF_SAMPLE_ADDR)
+ header.size += sizeof(u64);
+
+ if (sample_type & PERF_SAMPLE_ID)
+ header.size += sizeof(u64);
+
+ if (sample_type & PERF_SAMPLE_STREAM_ID)
+ header.size += sizeof(u64);
+
+ if (sample_type & PERF_SAMPLE_CPU) {
+ header.size += sizeof(cpu_entry);
+
+ cpu_entry.cpu = raw_smp_processor_id();
+ cpu_entry.reserved = 0;
+ }
+
+ if (sample_type & PERF_SAMPLE_PERIOD)
+ header.size += sizeof(u64);
+
+ if (sample_type & PERF_SAMPLE_GROUP) {
+ header.size += sizeof(u64) +
+ counter->nr_siblings * sizeof(group_entry);
+ }
+
+ if (sample_type & PERF_SAMPLE_CALLCHAIN) {
+ callchain = perf_callchain(data->regs);
+
+ if (callchain) {
+ callchain_size = (1 + callchain->nr) * sizeof(u64);
+ header.size += callchain_size;
+ } else
+ header.size += sizeof(u64);
+ }
+
+ ret = perf_output_begin(&handle, counter, header.size, nmi, 1);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, header);
+
+ if (sample_type & PERF_SAMPLE_IP)
+ perf_output_put(&handle, ip);
+
+ if (sample_type & PERF_SAMPLE_TID)
+ perf_output_put(&handle, tid_entry);
+
+ if (sample_type & PERF_SAMPLE_TIME)
+ perf_output_put(&handle, time);
+
+ if (sample_type & PERF_SAMPLE_ADDR)
+ perf_output_put(&handle, data->addr);
+
+ if (sample_type & PERF_SAMPLE_ID) {
+ u64 id = primary_counter_id(counter);
+
+ perf_output_put(&handle, id);
+ }
+
+ if (sample_type & PERF_SAMPLE_STREAM_ID)
+ perf_output_put(&handle, counter->id);
+
+ if (sample_type & PERF_SAMPLE_CPU)
+ perf_output_put(&handle, cpu_entry);
+
+ if (sample_type & PERF_SAMPLE_PERIOD)
+ perf_output_put(&handle, data->period);
+
+ /*
+ * XXX PERF_SAMPLE_GROUP vs inherited counters seems difficult.
+ */
+ if (sample_type & PERF_SAMPLE_GROUP) {
+ struct perf_counter *leader, *sub;
+ u64 nr = counter->nr_siblings;
+
+ perf_output_put(&handle, nr);
+
+ leader = counter->group_leader;
+ list_for_each_entry(sub, &leader->sibling_list, list_entry) {
+ if (sub != counter)
+ sub->pmu->read(sub);
+
+ group_entry.id = primary_counter_id(sub);
+ group_entry.counter = atomic64_read(&sub->count);
+
+ perf_output_put(&handle, group_entry);
+ }
+ }
+
+ if (sample_type & PERF_SAMPLE_CALLCHAIN) {
+ if (callchain)
+ perf_output_copy(&handle, callchain, callchain_size);
+ else {
+ u64 nr = 0;
+ perf_output_put(&handle, nr);
+ }
+ }
+
+ perf_output_end(&handle);
+}
+
+/*
+ * read event
+ */
+
+struct perf_read_event {
+ struct perf_event_header header;
+
+ u32 pid;
+ u32 tid;
+ u64 value;
+ u64 format[3];
+};
+
+static void
+perf_counter_read_event(struct perf_counter *counter,
+ struct task_struct *task)
+{
+ struct perf_output_handle handle;
+ struct perf_read_event event = {
+ .header = {
+ .type = PERF_EVENT_READ,
+ .misc = 0,
+ .size = sizeof(event) - sizeof(event.format),
+ },
+ .pid = perf_counter_pid(counter, task),
+ .tid = perf_counter_tid(counter, task),
+ .value = atomic64_read(&counter->count),
+ };
+ int ret, i = 0;
+
+ if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+ event.header.size += sizeof(u64);
+ event.format[i++] = counter->total_time_enabled;
+ }
+
+ if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+ event.header.size += sizeof(u64);
+ event.format[i++] = counter->total_time_running;
+ }
+
+ if (counter->attr.read_format & PERF_FORMAT_ID) {
+ event.header.size += sizeof(u64);
+ event.format[i++] = primary_counter_id(counter);
+ }
+
+ ret = perf_output_begin(&handle, counter, event.header.size, 0, 0);
+ if (ret)
+ return;
+
+ perf_output_copy(&handle, &event, event.header.size);
+ perf_output_end(&handle);
+}
+
+/*
+ * fork tracking
+ */
+
+struct perf_fork_event {
+ struct task_struct *task;
+
+ struct {
+ struct perf_event_header header;
+
+ u32 pid;
+ u32 ppid;
+ } event;
+};
+
+static void perf_counter_fork_output(struct perf_counter *counter,
+ struct perf_fork_event *fork_event)
+{
+ struct perf_output_handle handle;
+ int size = fork_event->event.header.size;
+ struct task_struct *task = fork_event->task;
+ int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+ if (ret)
+ return;
+
+ fork_event->event.pid = perf_counter_pid(counter, task);
+ fork_event->event.ppid = perf_counter_pid(counter, task->real_parent);
+
+ perf_output_put(&handle, fork_event->event);
+ perf_output_end(&handle);
+}
+
+static int perf_counter_fork_match(struct perf_counter *counter)
+{
+ if (counter->attr.comm || counter->attr.mmap)
+ return 1;
+
+ return 0;
+}
+
+static void perf_counter_fork_ctx(struct perf_counter_context *ctx,
+ struct perf_fork_event *fork_event)
+{
+ struct perf_counter *counter;
+
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+ return;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+ if (perf_counter_fork_match(counter))
+ perf_counter_fork_output(counter, fork_event);
+ }
+ rcu_read_unlock();
+}
+
+static void perf_counter_fork_event(struct perf_fork_event *fork_event)
+{
+ struct perf_cpu_context *cpuctx;
+ struct perf_counter_context *ctx;
+
+ cpuctx = &get_cpu_var(perf_cpu_context);
+ perf_counter_fork_ctx(&cpuctx->ctx, fork_event);
+ put_cpu_var(perf_cpu_context);
+
+ rcu_read_lock();
+ /*
+ * doesn't really matter which of the child contexts the
+ * events ends up in.
+ */
+ ctx = rcu_dereference(current->perf_counter_ctxp);
+ if (ctx)
+ perf_counter_fork_ctx(ctx, fork_event);
+ rcu_read_unlock();
+}
+
+void perf_counter_fork(struct task_struct *task)
+{
+ struct perf_fork_event fork_event;
+
+ if (!atomic_read(&nr_comm_counters) &&
+ !atomic_read(&nr_mmap_counters))
+ return;
+
+ fork_event = (struct perf_fork_event){
+ .task = task,
+ .event = {
+ .header = {
+ .type = PERF_EVENT_FORK,
+ .misc = 0,
+ .size = sizeof(fork_event.event),
+ },
+ /* .pid */
+ /* .ppid */
+ },
+ };
+
+ perf_counter_fork_event(&fork_event);
+}
+
+/*
+ * comm tracking
+ */
+
+struct perf_comm_event {
+ struct task_struct *task;
+ char *comm;
+ int comm_size;
+
+ struct {
+ struct perf_event_header header;
+
+ u32 pid;
+ u32 tid;
+ } event;
+};
+
+static void perf_counter_comm_output(struct perf_counter *counter,
+ struct perf_comm_event *comm_event)
+{
+ struct perf_output_handle handle;
+ int size = comm_event->event.header.size;
+ int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+ if (ret)
+ return;
+
+ comm_event->event.pid = perf_counter_pid(counter, comm_event->task);
+ comm_event->event.tid = perf_counter_tid(counter, comm_event->task);
+
+ perf_output_put(&handle, comm_event->event);
+ perf_output_copy(&handle, comm_event->comm,
+ comm_event->comm_size);
+ perf_output_end(&handle);
+}
+
+static int perf_counter_comm_match(struct perf_counter *counter)
+{
+ if (counter->attr.comm)
+ return 1;
+
+ return 0;
+}
+
+static void perf_counter_comm_ctx(struct perf_counter_context *ctx,
+ struct perf_comm_event *comm_event)
+{
+ struct perf_counter *counter;
+
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+ return;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+ if (perf_counter_comm_match(counter))
+ perf_counter_comm_output(counter, comm_event);
+ }
+ rcu_read_unlock();
+}
+
+static void perf_counter_comm_event(struct perf_comm_event *comm_event)
+{
+ struct perf_cpu_context *cpuctx;
+ struct perf_counter_context *ctx;
+ unsigned int size;
+ char comm[TASK_COMM_LEN];
+
+ memset(comm, 0, sizeof(comm));
+ strncpy(comm, comm_event->task->comm, sizeof(comm));
+ size = ALIGN(strlen(comm)+1, sizeof(u64));
+
+ comm_event->comm = comm;
+ comm_event->comm_size = size;
+
+ comm_event->event.header.size = sizeof(comm_event->event) + size;
+
+ cpuctx = &get_cpu_var(perf_cpu_context);
+ perf_counter_comm_ctx(&cpuctx->ctx, comm_event);
+ put_cpu_var(perf_cpu_context);
+
+ rcu_read_lock();
+ /*
+ * doesn't really matter which of the child contexts the
+ * events ends up in.
+ */
+ ctx = rcu_dereference(current->perf_counter_ctxp);
+ if (ctx)
+ perf_counter_comm_ctx(ctx, comm_event);
+ rcu_read_unlock();
+}
+
+void perf_counter_comm(struct task_struct *task)
+{
+ struct perf_comm_event comm_event;
+
+ if (task->perf_counter_ctxp)
+ perf_counter_enable_on_exec(task);
+
+ if (!atomic_read(&nr_comm_counters))
+ return;
+
+ comm_event = (struct perf_comm_event){
+ .task = task,
+ /* .comm */
+ /* .comm_size */
+ .event = {
+ .header = {
+ .type = PERF_EVENT_COMM,
+ .misc = 0,
+ /* .size */
+ },
+ /* .pid */
+ /* .tid */
+ },
+ };
+
+ perf_counter_comm_event(&comm_event);
+}
+
+/*
+ * mmap tracking
+ */
+
+struct perf_mmap_event {
+ struct vm_area_struct *vma;
+
+ const char *file_name;
+ int file_size;
+
+ struct {
+ struct perf_event_header header;
+
+ u32 pid;
+ u32 tid;
+ u64 start;
+ u64 len;
+ u64 pgoff;
+ } event;
+};
+
+static void perf_counter_mmap_output(struct perf_counter *counter,
+ struct perf_mmap_event *mmap_event)
+{
+ struct perf_output_handle handle;
+ int size = mmap_event->event.header.size;
+ int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+ if (ret)
+ return;
+
+ mmap_event->event.pid = perf_counter_pid(counter, current);
+ mmap_event->event.tid = perf_counter_tid(counter, current);
+
+ perf_output_put(&handle, mmap_event->event);
+ perf_output_copy(&handle, mmap_event->file_name,
+ mmap_event->file_size);
+ perf_output_end(&handle);
+}
+
+static int perf_counter_mmap_match(struct perf_counter *counter,
+ struct perf_mmap_event *mmap_event)
+{
+ if (counter->attr.mmap)
+ return 1;
+
+ return 0;
+}
+
+static void perf_counter_mmap_ctx(struct perf_counter_context *ctx,
+ struct perf_mmap_event *mmap_event)
+{
+ struct perf_counter *counter;
+
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+ return;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+ if (perf_counter_mmap_match(counter, mmap_event))
+ perf_counter_mmap_output(counter, mmap_event);
+ }
+ rcu_read_unlock();
+}
+
+static void perf_counter_mmap_event(struct perf_mmap_event *mmap_event)
+{
+ struct perf_cpu_context *cpuctx;
+ struct perf_counter_context *ctx;
+ struct vm_area_struct *vma = mmap_event->vma;
+ struct file *file = vma->vm_file;
+ unsigned int size;
+ char tmp[16];
+ char *buf = NULL;
+ const char *name;
+
+ memset(tmp, 0, sizeof(tmp));
+
+ if (file) {
+ /*
+ * d_path works from the end of the buffer backwards, so we
+ * need to add enough zero bytes after the string to handle
+ * the 64bit alignment we do later.
+ */
+ buf = kzalloc(PATH_MAX + sizeof(u64), GFP_KERNEL);
+ if (!buf) {
+ name = strncpy(tmp, "//enomem", sizeof(tmp));
+ goto got_name;
+ }
+ name = d_path(&file->f_path, buf, PATH_MAX);
+ if (IS_ERR(name)) {
+ name = strncpy(tmp, "//toolong", sizeof(tmp));
+ goto got_name;
+ }
+ } else {
+ if (arch_vma_name(mmap_event->vma)) {
+ name = strncpy(tmp, arch_vma_name(mmap_event->vma),
+ sizeof(tmp));
+ goto got_name;
+ }
+
+ if (!vma->vm_mm) {
+ name = strncpy(tmp, "[vdso]", sizeof(tmp));
+ goto got_name;
+ }
+
+ name = strncpy(tmp, "//anon", sizeof(tmp));
+ goto got_name;
+ }
+
+got_name:
+ size = ALIGN(strlen(name)+1, sizeof(u64));
+
+ mmap_event->file_name = name;
+ mmap_event->file_size = size;
+
+ mmap_event->event.header.size = sizeof(mmap_event->event) + size;
+
+ cpuctx = &get_cpu_var(perf_cpu_context);
+ perf_counter_mmap_ctx(&cpuctx->ctx, mmap_event);
+ put_cpu_var(perf_cpu_context);
+
+ rcu_read_lock();
+ /*
+ * doesn't really matter which of the child contexts the
+ * events ends up in.
+ */
+ ctx = rcu_dereference(current->perf_counter_ctxp);
+ if (ctx)
+ perf_counter_mmap_ctx(ctx, mmap_event);
+ rcu_read_unlock();
+
+ kfree(buf);
+}
+
+void __perf_counter_mmap(struct vm_area_struct *vma)
+{
+ struct perf_mmap_event mmap_event;
+
+ if (!atomic_read(&nr_mmap_counters))
+ return;
+
+ mmap_event = (struct perf_mmap_event){
+ .vma = vma,
+ /* .file_name */
+ /* .file_size */
+ .event = {
+ .header = {
+ .type = PERF_EVENT_MMAP,
+ .misc = 0,
+ /* .size */
+ },
+ /* .pid */
+ /* .tid */
+ .start = vma->vm_start,
+ .len = vma->vm_end - vma->vm_start,
+ .pgoff = vma->vm_pgoff,
+ },
+ };
+
+ perf_counter_mmap_event(&mmap_event);
+}
+
+/*
+ * IRQ throttle logging
+ */
+
+static void perf_log_throttle(struct perf_counter *counter, int enable)
+{
+ struct perf_output_handle handle;
+ int ret;
+
+ struct {
+ struct perf_event_header header;
+ u64 time;
+ u64 id;
+ u64 stream_id;
+ } throttle_event = {
+ .header = {
+ .type = PERF_EVENT_THROTTLE,
+ .misc = 0,
+ .size = sizeof(throttle_event),
+ },
+ .time = sched_clock(),
+ .id = primary_counter_id(counter),
+ .stream_id = counter->id,
+ };
+
+ if (enable)
+ throttle_event.header.type = PERF_EVENT_UNTHROTTLE;
+
+ ret = perf_output_begin(&handle, counter, sizeof(throttle_event), 1, 0);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, throttle_event);
+ perf_output_end(&handle);
+}
+
+/*
+ * Generic counter overflow handling, sampling.
+ */
+
+int perf_counter_overflow(struct perf_counter *counter, int nmi,
+ struct perf_sample_data *data)
+{
+ int events = atomic_read(&counter->event_limit);
+ int throttle = counter->pmu->unthrottle != NULL;
+ struct hw_perf_counter *hwc = &counter->hw;
+ int ret = 0;
+
+ if (!throttle) {
+ hwc->interrupts++;
+ } else {
+ if (hwc->interrupts != MAX_INTERRUPTS) {
+ hwc->interrupts++;
+ if (HZ * hwc->interrupts >
+ (u64)sysctl_perf_counter_sample_rate) {
+ hwc->interrupts = MAX_INTERRUPTS;
+ perf_log_throttle(counter, 0);
+ ret = 1;
+ }
+ } else {
+ /*
+ * Keep re-disabling counters even though on the previous
+ * pass we disabled it - just in case we raced with a
+ * sched-in and the counter got enabled again:
+ */
+ ret = 1;
+ }
+ }
- curr_rq_lock_irq_save(&flags);
- counter->hw_ops->read(counter);
- curr_rq_unlock_irq_restore(&flags);
-}
+ if (counter->attr.freq) {
+ u64 now = sched_clock();
+ s64 delta = now - hwc->freq_stamp;
+
+ hwc->freq_stamp = now;
+
+ if (delta > 0 && delta < TICK_NSEC)
+ perf_adjust_period(counter, NSEC_PER_SEC / (int)delta);
+ }
-static u64 perf_counter_read(struct perf_counter *counter)
-{
/*
- * If counter is enabled and currently active on a CPU, update the
- * value in the counter structure:
+ * XXX event_limit might not quite work as expected on inherited
+ * counters
*/
- if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
- smp_call_function_single(counter->oncpu,
- __read, counter, 1);
+
+ counter->pending_kill = POLL_IN;
+ if (events && atomic_dec_and_test(&counter->event_limit)) {
+ ret = 1;
+ counter->pending_kill = POLL_HUP;
+ if (nmi) {
+ counter->pending_disable = 1;
+ perf_pending_queue(&counter->pending,
+ perf_pending_counter);
+ } else
+ perf_counter_disable(counter);
}
- return atomic64_read(&counter->count);
+ perf_counter_output(counter, nmi, data);
+ return ret;
}
/*
- * Cross CPU call to switch performance data pointers
+ * Generic software counter infrastructure
*/
-static void __perf_switch_irq_data(void *info)
+
+static void perf_swcounter_update(struct perf_counter *counter)
{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- struct perf_counter *counter = info;
- struct perf_counter_context *ctx = counter->ctx;
- struct perf_data *oldirqdata = counter->irqdata;
+ struct hw_perf_counter *hwc = &counter->hw;
+ u64 prev, now;
+ s64 delta;
- /*
- * If this is a task context, we need to check whether it is
- * the current task context of this cpu. If not it has been
- * scheduled out before the smp call arrived.
- */
- if (ctx->task) {
- if (cpuctx->task_ctx != ctx)
- return;
- spin_lock(&ctx->lock);
- }
+again:
+ prev = atomic64_read(&hwc->prev_count);
+ now = atomic64_read(&hwc->count);
+ if (atomic64_cmpxchg(&hwc->prev_count, prev, now) != prev)
+ goto again;
- /* Change the pointer NMI safe */
- atomic_long_set((atomic_long_t *)&counter->irqdata,
- (unsigned long) counter->usrdata);
- counter->usrdata = oldirqdata;
+ delta = now - prev;
- if (ctx->task)
- spin_unlock(&ctx->lock);
+ atomic64_add(delta, &counter->count);
+ atomic64_sub(delta, &hwc->period_left);
}
-static struct perf_data *perf_switch_irq_data(struct perf_counter *counter)
+static void perf_swcounter_set_period(struct perf_counter *counter)
{
- struct perf_counter_context *ctx = counter->ctx;
- struct perf_data *oldirqdata = counter->irqdata;
- struct task_struct *task = ctx->task;
-
- if (!task) {
- smp_call_function_single(counter->cpu,
- __perf_switch_irq_data,
- counter, 1);
- return counter->usrdata;
+ struct hw_perf_counter *hwc = &counter->hw;
+ s64 left = atomic64_read(&hwc->period_left);
+ s64 period = hwc->sample_period;
+
+ if (unlikely(left <= -period)) {
+ left = period;
+ atomic64_set(&hwc->period_left, left);
+ hwc->last_period = period;
}
-retry:
- spin_lock_irq(&ctx->lock);
- if (counter->state != PERF_COUNTER_STATE_ACTIVE) {
- counter->irqdata = counter->usrdata;
- counter->usrdata = oldirqdata;
- spin_unlock_irq(&ctx->lock);
- return oldirqdata;
+ if (unlikely(left <= 0)) {
+ left += period;
+ atomic64_add(period, &hwc->period_left);
+ hwc->last_period = period;
}
- spin_unlock_irq(&ctx->lock);
- task_oncpu_function_call(task, __perf_switch_irq_data, counter);
- /* Might have failed, because task was scheduled out */
- if (counter->irqdata == oldirqdata)
- goto retry;
- return counter->usrdata;
+ atomic64_set(&hwc->prev_count, -left);
+ atomic64_set(&hwc->count, -left);
}
-static void put_context(struct perf_counter_context *ctx)
+static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
{
- if (ctx->task)
- put_task_struct(ctx->task);
-}
+ enum hrtimer_restart ret = HRTIMER_RESTART;
+ struct perf_sample_data data;
+ struct perf_counter *counter;
+ u64 period;
-static struct perf_counter_context *find_get_context(pid_t pid, int cpu)
-{
- struct perf_cpu_context *cpuctx;
- struct perf_counter_context *ctx;
- struct task_struct *task;
+ counter = container_of(hrtimer, struct perf_counter, hw.hrtimer);
+ counter->pmu->read(counter);
+ data.addr = 0;
+ data.regs = get_irq_regs();
/*
- * If cpu is not a wildcard then this is a percpu counter:
+ * In case we exclude kernel IPs or are somehow not in interrupt
+ * context, provide the next best thing, the user IP.
*/
- if (cpu != -1) {
- /* Must be root to operate on a CPU counter: */
- if (!capable(CAP_SYS_ADMIN))
- return ERR_PTR(-EACCES);
+ if ((counter->attr.exclude_kernel || !data.regs) &&
+ !counter->attr.exclude_user)
+ data.regs = task_pt_regs(current);
- if (cpu < 0 || cpu > num_possible_cpus())
- return ERR_PTR(-EINVAL);
+ if (data.regs) {
+ if (perf_counter_overflow(counter, 0, &data))
+ ret = HRTIMER_NORESTART;
+ }
- /*
- * We could be clever and allow to attach a counter to an
- * offline CPU and activate it when the CPU comes up, but
- * that's for later.
- */
- if (!cpu_isset(cpu, cpu_online_map))
- return ERR_PTR(-ENODEV);
+ period = max_t(u64, 10000, counter->hw.sample_period);
+ hrtimer_forward_now(hrtimer, ns_to_ktime(period));
- cpuctx = &per_cpu(perf_cpu_context, cpu);
- ctx = &cpuctx->ctx;
+ return ret;
+}
- return ctx;
- }
+static void perf_swcounter_overflow(struct perf_counter *counter,
+ int nmi, struct perf_sample_data *data)
+{
+ data->period = counter->hw.last_period;
- rcu_read_lock();
- if (!pid)
- task = current;
- else
- task = find_task_by_vpid(pid);
- if (task)
- get_task_struct(task);
- rcu_read_unlock();
+ perf_swcounter_update(counter);
+ perf_swcounter_set_period(counter);
+ if (perf_counter_overflow(counter, nmi, data))
+ /* soft-disable the counter */
+ ;
+}
- if (!task)
- return ERR_PTR(-ESRCH);
+static int perf_swcounter_is_counting(struct perf_counter *counter)
+{
+ struct perf_counter_context *ctx;
+ unsigned long flags;
+ int count;
- ctx = &task->perf_counter_ctx;
- ctx->task = task;
+ if (counter->state == PERF_COUNTER_STATE_ACTIVE)
+ return 1;
- /* Reuse ptrace permission checks for now. */
- if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
- put_context(ctx);
- return ERR_PTR(-EACCES);
- }
+ if (counter->state != PERF_COUNTER_STATE_INACTIVE)
+ return 0;
- return ctx;
+ /*
+ * If the counter is inactive, it could be just because
+ * its task is scheduled out, or because it's in a group
+ * which could not go on the PMU. We want to count in
+ * the first case but not the second. If the context is
+ * currently active then an inactive software counter must
+ * be the second case. If it's not currently active then
+ * we need to know whether the counter was active when the
+ * context was last active, which we can determine by
+ * comparing counter->tstamp_stopped with ctx->time.
+ *
+ * We are within an RCU read-side critical section,
+ * which protects the existence of *ctx.
+ */
+ ctx = counter->ctx;
+ spin_lock_irqsave(&ctx->lock, flags);
+ count = 1;
+ /* Re-check state now we have the lock */
+ if (counter->state < PERF_COUNTER_STATE_INACTIVE ||
+ counter->ctx->is_active ||
+ counter->tstamp_stopped < ctx->time)
+ count = 0;
+ spin_unlock_irqrestore(&ctx->lock, flags);
+ return count;
}
-/*
- * Called when the last reference to the file is gone.
- */
-static int perf_release(struct inode *inode, struct file *file)
+static int perf_swcounter_match(struct perf_counter *counter,
+ enum perf_type_id type,
+ u32 event, struct pt_regs *regs)
{
- struct perf_counter *counter = file->private_data;
- struct perf_counter_context *ctx = counter->ctx;
-
- file->private_data = NULL;
-
- mutex_lock(&counter->mutex);
+ if (!perf_swcounter_is_counting(counter))
+ return 0;
- perf_counter_remove_from_context(counter);
- put_context(ctx);
+ if (counter->attr.type != type)
+ return 0;
+ if (counter->attr.config != event)
+ return 0;
- mutex_unlock(&counter->mutex);
+ if (regs) {
+ if (counter->attr.exclude_user && user_mode(regs))
+ return 0;
- kfree(counter);
+ if (counter->attr.exclude_kernel && !user_mode(regs))
+ return 0;
+ }
- return 0;
+ return 1;
}
-/*
- * Read the performance counter - simple non blocking version for now
- */
-static ssize_t
-perf_read_hw(struct perf_counter *counter, char __user *buf, size_t count)
+static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
+ int nmi, struct perf_sample_data *data)
{
- u64 cntval;
-
- if (count != sizeof(cntval))
- return -EINVAL;
-
- mutex_lock(&counter->mutex);
- cntval = perf_counter_read(counter);
- mutex_unlock(&counter->mutex);
+ int neg = atomic64_add_negative(nr, &counter->hw.count);
- return put_user(cntval, (u64 __user *) buf) ? -EFAULT : sizeof(cntval);
+ if (counter->hw.sample_period && !neg && data->regs)
+ perf_swcounter_overflow(counter, nmi, data);
}
-static ssize_t
-perf_copy_usrdata(struct perf_data *usrdata, char __user *buf, size_t count)
+static void perf_swcounter_ctx_event(struct perf_counter_context *ctx,
+ enum perf_type_id type,
+ u32 event, u64 nr, int nmi,
+ struct perf_sample_data *data)
{
- if (!usrdata->len)
- return 0;
-
- count = min(count, (size_t)usrdata->len);
- if (copy_to_user(buf, usrdata->data + usrdata->rd_idx, count))
- return -EFAULT;
+ struct perf_counter *counter;
- /* Adjust the counters */
- usrdata->len -= count;
- if (!usrdata->len)
- usrdata->rd_idx = 0;
- else
- usrdata->rd_idx += count;
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+ return;
- return count;
+ rcu_read_lock();
+ list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+ if (perf_swcounter_match(counter, type, event, data->regs))
+ perf_swcounter_add(counter, nr, nmi, data);
+ }
+ rcu_read_unlock();
}
-static ssize_t
-perf_read_irq_data(struct perf_counter *counter,
- char __user *buf,
- size_t count,
- int nonblocking)
+static int *perf_swcounter_recursion_context(struct perf_cpu_context *cpuctx)
{
- struct perf_data *irqdata, *usrdata;
- DECLARE_WAITQUEUE(wait, current);
- ssize_t res;
+ if (in_nmi())
+ return &cpuctx->recursion[3];
- irqdata = counter->irqdata;
- usrdata = counter->usrdata;
+ if (in_irq())
+ return &cpuctx->recursion[2];
- if (usrdata->len + irqdata->len >= count)
- goto read_pending;
+ if (in_softirq())
+ return &cpuctx->recursion[1];
- if (nonblocking)
- return -EAGAIN;
+ return &cpuctx->recursion[0];
+}
- spin_lock_irq(&counter->waitq.lock);
- __add_wait_queue(&counter->waitq, &wait);
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (usrdata->len + irqdata->len >= count)
- break;
+static void do_perf_swcounter_event(enum perf_type_id type, u32 event,
+ u64 nr, int nmi,
+ struct perf_sample_data *data)
+{
+ struct perf_cpu_context *cpuctx = &get_cpu_var(perf_cpu_context);
+ int *recursion = perf_swcounter_recursion_context(cpuctx);
+ struct perf_counter_context *ctx;
- if (signal_pending(current))
- break;
+ if (*recursion)
+ goto out;
- spin_unlock_irq(&counter->waitq.lock);
- schedule();
- spin_lock_irq(&counter->waitq.lock);
- }
- __remove_wait_queue(&counter->waitq, &wait);
- __set_current_state(TASK_RUNNING);
- spin_unlock_irq(&counter->waitq.lock);
+ (*recursion)++;
+ barrier();
- if (usrdata->len + irqdata->len < count)
- return -ERESTARTSYS;
-read_pending:
- mutex_lock(&counter->mutex);
+ perf_swcounter_ctx_event(&cpuctx->ctx, type, event,
+ nr, nmi, data);
+ rcu_read_lock();
+ /*
+ * doesn't really matter which of the child contexts the
+ * events ends up in.
+ */
+ ctx = rcu_dereference(current->perf_counter_ctxp);
+ if (ctx)
+ perf_swcounter_ctx_event(ctx, type, event, nr, nmi, data);
+ rcu_read_unlock();
- /* Drain pending data first: */
- res = perf_copy_usrdata(usrdata, buf, count);
- if (res < 0 || res == count)
- goto out;
+ barrier();
+ (*recursion)--;
- /* Switch irq buffer: */
- usrdata = perf_switch_irq_data(counter);
- if (perf_copy_usrdata(usrdata, buf + res, count - res) < 0) {
- if (!res)
- res = -EFAULT;
- } else {
- res = count;
- }
out:
- mutex_unlock(&counter->mutex);
-
- return res;
+ put_cpu_var(perf_cpu_context);
}
-static ssize_t
-perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+void __perf_swcounter_event(u32 event, u64 nr, int nmi,
+ struct pt_regs *regs, u64 addr)
{
- struct perf_counter *counter = file->private_data;
-
- switch (counter->hw_event.record_type) {
- case PERF_RECORD_SIMPLE:
- return perf_read_hw(counter, buf, count);
+ struct perf_sample_data data = {
+ .regs = regs,
+ .addr = addr,
+ };
- case PERF_RECORD_IRQ:
- case PERF_RECORD_GROUP:
- return perf_read_irq_data(counter, buf, count,
- file->f_flags & O_NONBLOCK);
- }
- return -EINVAL;
+ do_perf_swcounter_event(PERF_TYPE_SOFTWARE, event, nr, nmi, &data);
}
-static unsigned int perf_poll(struct file *file, poll_table *wait)
+static void perf_swcounter_read(struct perf_counter *counter)
{
- struct perf_counter *counter = file->private_data;
- unsigned int events = 0;
- unsigned long flags;
-
- poll_wait(file, &counter->waitq, wait);
+ perf_swcounter_update(counter);
+}
- spin_lock_irqsave(&counter->waitq.lock, flags);
- if (counter->usrdata->len || counter->irqdata->len)
- events |= POLLIN;
- spin_unlock_irqrestore(&counter->waitq.lock, flags);
+static int perf_swcounter_enable(struct perf_counter *counter)
+{
+ perf_swcounter_set_period(counter);
+ return 0;
+}
- return events;
+static void perf_swcounter_disable(struct perf_counter *counter)
+{
+ perf_swcounter_update(counter);
}
-static const struct file_operations perf_fops = {
- .release = perf_release,
- .read = perf_read,
- .poll = perf_poll,
+static const struct pmu perf_ops_generic = {
+ .enable = perf_swcounter_enable,
+ .disable = perf_swcounter_disable,
+ .read = perf_swcounter_read,
};
-static int cpu_clock_perf_counter_enable(struct perf_counter *counter)
-{
- int cpu = raw_smp_processor_id();
-
- atomic64_set(&counter->hw.prev_count, cpu_clock(cpu));
- return 0;
-}
+/*
+ * Software counter: cpu wall time clock
+ */
static void cpu_clock_perf_counter_update(struct perf_counter *counter)
{
atomic64_add(now - prev, &counter->count);
}
+static int cpu_clock_perf_counter_enable(struct perf_counter *counter)
+{
+ struct hw_perf_counter *hwc = &counter->hw;
+ int cpu = raw_smp_processor_id();
+
+ atomic64_set(&hwc->prev_count, cpu_clock(cpu));
+ hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ hwc->hrtimer.function = perf_swcounter_hrtimer;
+ if (hwc->sample_period) {
+ u64 period = max_t(u64, 10000, hwc->sample_period);
+ __hrtimer_start_range_ns(&hwc->hrtimer,
+ ns_to_ktime(period), 0,
+ HRTIMER_MODE_REL, 0);
+ }
+
+ return 0;
+}
+
static void cpu_clock_perf_counter_disable(struct perf_counter *counter)
{
+ if (counter->hw.sample_period)
+ hrtimer_cancel(&counter->hw.hrtimer);
cpu_clock_perf_counter_update(counter);
}
cpu_clock_perf_counter_update(counter);
}
-static const struct hw_perf_counter_ops perf_ops_cpu_clock = {
+static const struct pmu perf_ops_cpu_clock = {
.enable = cpu_clock_perf_counter_enable,
.disable = cpu_clock_perf_counter_disable,
.read = cpu_clock_perf_counter_read,
};
/*
- * Called from within the scheduler:
+ * Software counter: task time clock
*/
-static u64 task_clock_perf_counter_val(struct perf_counter *counter, int update)
-{
- struct task_struct *curr = counter->task;
- u64 delta;
-
- delta = __task_delta_exec(curr, update);
-
- return curr->se.sum_exec_runtime + delta;
-}
static void task_clock_perf_counter_update(struct perf_counter *counter, u64 now)
{
u64 prev;
s64 delta;
- prev = atomic64_read(&counter->hw.prev_count);
-
- atomic64_set(&counter->hw.prev_count, now);
-
+ prev = atomic64_xchg(&counter->hw.prev_count, now);
delta = now - prev;
-
atomic64_add(delta, &counter->count);
}
-static void task_clock_perf_counter_read(struct perf_counter *counter)
-{
- u64 now = task_clock_perf_counter_val(counter, 1);
-
- task_clock_perf_counter_update(counter, now);
-}
-
static int task_clock_perf_counter_enable(struct perf_counter *counter)
{
- u64 now = task_clock_perf_counter_val(counter, 0);
-
- atomic64_set(&counter->hw.prev_count, now);
-
- return 0;
-}
-
-static void task_clock_perf_counter_disable(struct perf_counter *counter)
-{
- u64 now = task_clock_perf_counter_val(counter, 0);
-
- task_clock_perf_counter_update(counter, now);
-}
-
-static const struct hw_perf_counter_ops perf_ops_task_clock = {
- .enable = task_clock_perf_counter_enable,
- .disable = task_clock_perf_counter_disable,
- .read = task_clock_perf_counter_read,
-};
-
-static u64 get_page_faults(void)
-{
- struct task_struct *curr = current;
-
- return curr->maj_flt + curr->min_flt;
-}
-
-static void page_faults_perf_counter_update(struct perf_counter *counter)
-{
- u64 prev, now;
- s64 delta;
-
- prev = atomic64_read(&counter->hw.prev_count);
- now = get_page_faults();
-
- atomic64_set(&counter->hw.prev_count, now);
-
- delta = now - prev;
-
- atomic64_add(delta, &counter->count);
-}
+ struct hw_perf_counter *hwc = &counter->hw;
+ u64 now;
-static void page_faults_perf_counter_read(struct perf_counter *counter)
-{
- page_faults_perf_counter_update(counter);
-}
+ now = counter->ctx->time;
-static int page_faults_perf_counter_enable(struct perf_counter *counter)
-{
- /*
- * page-faults is a per-task value already,
- * so we dont have to clear it on switch-in.
- */
+ atomic64_set(&hwc->prev_count, now);
+ hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ hwc->hrtimer.function = perf_swcounter_hrtimer;
+ if (hwc->sample_period) {
+ u64 period = max_t(u64, 10000, hwc->sample_period);
+ __hrtimer_start_range_ns(&hwc->hrtimer,
+ ns_to_ktime(period), 0,
+ HRTIMER_MODE_REL, 0);
+ }
return 0;
}
-static void page_faults_perf_counter_disable(struct perf_counter *counter)
-{
- page_faults_perf_counter_update(counter);
-}
-
-static const struct hw_perf_counter_ops perf_ops_page_faults = {
- .enable = page_faults_perf_counter_enable,
- .disable = page_faults_perf_counter_disable,
- .read = page_faults_perf_counter_read,
-};
-
-static u64 get_context_switches(void)
+static void task_clock_perf_counter_disable(struct perf_counter *counter)
{
- struct task_struct *curr = current;
+ if (counter->hw.sample_period)
+ hrtimer_cancel(&counter->hw.hrtimer);
+ task_clock_perf_counter_update(counter, counter->ctx->time);
- return curr->nvcsw + curr->nivcsw;
}
-static void context_switches_perf_counter_update(struct perf_counter *counter)
+static void task_clock_perf_counter_read(struct perf_counter *counter)
{
- u64 prev, now;
- s64 delta;
-
- prev = atomic64_read(&counter->hw.prev_count);
- now = get_context_switches();
-
- atomic64_set(&counter->hw.prev_count, now);
-
- delta = now - prev;
+ u64 time;
- atomic64_add(delta, &counter->count);
-}
+ if (!in_nmi()) {
+ update_context_time(counter->ctx);
+ time = counter->ctx->time;
+ } else {
+ u64 now = perf_clock();
+ u64 delta = now - counter->ctx->timestamp;
+ time = counter->ctx->time + delta;
+ }
-static void context_switches_perf_counter_read(struct perf_counter *counter)
-{
- context_switches_perf_counter_update(counter);
+ task_clock_perf_counter_update(counter, time);
}
-static int context_switches_perf_counter_enable(struct perf_counter *counter)
+static const struct pmu perf_ops_task_clock = {
+ .enable = task_clock_perf_counter_enable,
+ .disable = task_clock_perf_counter_disable,
+ .read = task_clock_perf_counter_read,
+};
+
+#ifdef CONFIG_EVENT_PROFILE
+void perf_tpcounter_event(int event_id)
{
- /*
- * ->nvcsw + curr->nivcsw is a per-task value already,
- * so we dont have to clear it on switch-in.
- */
+ struct perf_sample_data data = {
+ .regs = get_irq_regs(),
+ .addr = 0,
+ };
- return 0;
-}
+ if (!data.regs)
+ data.regs = task_pt_regs(current);
-static void context_switches_perf_counter_disable(struct perf_counter *counter)
-{
- context_switches_perf_counter_update(counter);
+ do_perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, 1, 1, &data);
}
+EXPORT_SYMBOL_GPL(perf_tpcounter_event);
-static const struct hw_perf_counter_ops perf_ops_context_switches = {
- .enable = context_switches_perf_counter_enable,
- .disable = context_switches_perf_counter_disable,
- .read = context_switches_perf_counter_read,
-};
+extern int ftrace_profile_enable(int);
+extern void ftrace_profile_disable(int);
-static inline u64 get_cpu_migrations(void)
+static void tp_perf_counter_destroy(struct perf_counter *counter)
{
- return current->se.nr_migrations;
+ ftrace_profile_disable(counter->attr.config);
}
-static void cpu_migrations_perf_counter_update(struct perf_counter *counter)
+static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
{
- u64 prev, now;
- s64 delta;
-
- prev = atomic64_read(&counter->hw.prev_count);
- now = get_cpu_migrations();
-
- atomic64_set(&counter->hw.prev_count, now);
+ if (ftrace_profile_enable(counter->attr.config))
+ return NULL;
- delta = now - prev;
+ counter->destroy = tp_perf_counter_destroy;
- atomic64_add(delta, &counter->count);
+ return &perf_ops_generic;
}
-
-static void cpu_migrations_perf_counter_read(struct perf_counter *counter)
+#else
+static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
{
- cpu_migrations_perf_counter_update(counter);
+ return NULL;
}
+#endif
-static int cpu_migrations_perf_counter_enable(struct perf_counter *counter)
+atomic_t perf_swcounter_enabled[PERF_COUNT_SW_MAX];
+
+static void sw_perf_counter_destroy(struct perf_counter *counter)
{
- /*
- * se.nr_migrations is a per-task value already,
- * so we dont have to clear it on switch-in.
- */
+ u64 event = counter->attr.config;
- return 0;
-}
+ WARN_ON(counter->parent);
-static void cpu_migrations_perf_counter_disable(struct perf_counter *counter)
-{
- cpu_migrations_perf_counter_update(counter);
+ atomic_dec(&perf_swcounter_enabled[event]);
}
-static const struct hw_perf_counter_ops perf_ops_cpu_migrations = {
- .enable = cpu_migrations_perf_counter_enable,
- .disable = cpu_migrations_perf_counter_disable,
- .read = cpu_migrations_perf_counter_read,
-};
-
-static const struct hw_perf_counter_ops *
-sw_perf_counter_init(struct perf_counter *counter)
+static const struct pmu *sw_perf_counter_init(struct perf_counter *counter)
{
- const struct hw_perf_counter_ops *hw_ops = NULL;
+ const struct pmu *pmu = NULL;
+ u64 event = counter->attr.config;
+
+ /*
+ * Software counters (currently) can't in general distinguish
+ * between user, kernel and hypervisor events.
+ * However, context switches and cpu migrations are considered
+ * to be kernel events, and page faults are never hypervisor
+ * events.
+ */
+ switch (event) {
+ case PERF_COUNT_SW_CPU_CLOCK:
+ pmu = &perf_ops_cpu_clock;
- switch (counter->hw_event.type) {
- case PERF_COUNT_CPU_CLOCK:
- hw_ops = &perf_ops_cpu_clock;
- break;
- case PERF_COUNT_TASK_CLOCK:
- hw_ops = &perf_ops_task_clock;
- break;
- case PERF_COUNT_PAGE_FAULTS:
- hw_ops = &perf_ops_page_faults;
- break;
- case PERF_COUNT_CONTEXT_SWITCHES:
- hw_ops = &perf_ops_context_switches;
break;
- case PERF_COUNT_CPU_MIGRATIONS:
- hw_ops = &perf_ops_cpu_migrations;
+ case PERF_COUNT_SW_TASK_CLOCK:
+ /*
+ * If the user instantiates this as a per-cpu counter,
+ * use the cpu_clock counter instead.
+ */
+ if (counter->ctx->task)
+ pmu = &perf_ops_task_clock;
+ else
+ pmu = &perf_ops_cpu_clock;
+
break;
- default:
+ case PERF_COUNT_SW_PAGE_FAULTS:
+ case PERF_COUNT_SW_PAGE_FAULTS_MIN:
+ case PERF_COUNT_SW_PAGE_FAULTS_MAJ:
+ case PERF_COUNT_SW_CONTEXT_SWITCHES:
+ case PERF_COUNT_SW_CPU_MIGRATIONS:
+ if (!counter->parent) {
+ atomic_inc(&perf_swcounter_enabled[event]);
+ counter->destroy = sw_perf_counter_destroy;
+ }
+ pmu = &perf_ops_generic;
break;
}
- return hw_ops;
+
+ return pmu;
}
/*
* Allocate and initialize a counter structure
*/
static struct perf_counter *
-perf_counter_alloc(struct perf_counter_hw_event *hw_event,
+perf_counter_alloc(struct perf_counter_attr *attr,
int cpu,
+ struct perf_counter_context *ctx,
struct perf_counter *group_leader,
+ struct perf_counter *parent_counter,
gfp_t gfpflags)
{
- const struct hw_perf_counter_ops *hw_ops;
+ const struct pmu *pmu;
struct perf_counter *counter;
+ struct hw_perf_counter *hwc;
+ long err;
counter = kzalloc(sizeof(*counter), gfpflags);
if (!counter)
- return NULL;
+ return ERR_PTR(-ENOMEM);
/*
* Single counters are their own group leaders, with an
if (!group_leader)
group_leader = counter;
- mutex_init(&counter->mutex);
+ mutex_init(&counter->child_mutex);
+ INIT_LIST_HEAD(&counter->child_list);
+
INIT_LIST_HEAD(&counter->list_entry);
+ INIT_LIST_HEAD(&counter->event_entry);
INIT_LIST_HEAD(&counter->sibling_list);
init_waitqueue_head(&counter->waitq);
- counter->irqdata = &counter->data[0];
- counter->usrdata = &counter->data[1];
- counter->cpu = cpu;
- counter->hw_event = *hw_event;
- counter->wakeup_pending = 0;
- counter->group_leader = group_leader;
- counter->hw_ops = NULL;
+ mutex_init(&counter->mmap_mutex);
- counter->state = PERF_COUNTER_STATE_INACTIVE;
- if (hw_event->disabled)
+ counter->cpu = cpu;
+ counter->attr = *attr;
+ counter->group_leader = group_leader;
+ counter->pmu = NULL;
+ counter->ctx = ctx;
+ counter->oncpu = -1;
+
+ counter->parent = parent_counter;
+
+ counter->ns = get_pid_ns(current->nsproxy->pid_ns);
+ counter->id = atomic64_inc_return(&perf_counter_id);
+
+ counter->state = PERF_COUNTER_STATE_INACTIVE;
+
+ if (attr->disabled)
counter->state = PERF_COUNTER_STATE_OFF;
- hw_ops = NULL;
- if (!hw_event->raw && hw_event->type < 0)
- hw_ops = sw_perf_counter_init(counter);
- if (!hw_ops)
- hw_ops = hw_perf_counter_init(counter);
+ pmu = NULL;
+
+ hwc = &counter->hw;
+ hwc->sample_period = attr->sample_period;
+ if (attr->freq && attr->sample_freq)
+ hwc->sample_period = 1;
+
+ atomic64_set(&hwc->period_left, hwc->sample_period);
+
+ /*
+ * we currently do not support PERF_SAMPLE_GROUP on inherited counters
+ */
+ if (attr->inherit && (attr->sample_type & PERF_SAMPLE_GROUP))
+ goto done;
+
+ switch (attr->type) {
+ case PERF_TYPE_RAW:
+ case PERF_TYPE_HARDWARE:
+ case PERF_TYPE_HW_CACHE:
+ pmu = hw_perf_counter_init(counter);
+ break;
+
+ case PERF_TYPE_SOFTWARE:
+ pmu = sw_perf_counter_init(counter);
+ break;
+
+ case PERF_TYPE_TRACEPOINT:
+ pmu = tp_perf_counter_init(counter);
+ break;
- if (!hw_ops) {
+ default:
+ break;
+ }
+done:
+ err = 0;
+ if (!pmu)
+ err = -EINVAL;
+ else if (IS_ERR(pmu))
+ err = PTR_ERR(pmu);
+
+ if (err) {
+ if (counter->ns)
+ put_pid_ns(counter->ns);
kfree(counter);
- return NULL;
+ return ERR_PTR(err);
+ }
+
+ counter->pmu = pmu;
+
+ if (!counter->parent) {
+ atomic_inc(&nr_counters);
+ if (counter->attr.mmap)
+ atomic_inc(&nr_mmap_counters);
+ if (counter->attr.comm)
+ atomic_inc(&nr_comm_counters);
}
- counter->hw_ops = hw_ops;
return counter;
}
+static int perf_copy_attr(struct perf_counter_attr __user *uattr,
+ struct perf_counter_attr *attr)
+{
+ int ret;
+ u32 size;
+
+ if (!access_ok(VERIFY_WRITE, uattr, PERF_ATTR_SIZE_VER0))
+ return -EFAULT;
+
+ /*
+ * zero the full structure, so that a short copy will be nice.
+ */
+ memset(attr, 0, sizeof(*attr));
+
+ ret = get_user(size, &uattr->size);
+ if (ret)
+ return ret;
+
+ if (size > PAGE_SIZE) /* silly large */
+ goto err_size;
+
+ if (!size) /* abi compat */
+ size = PERF_ATTR_SIZE_VER0;
+
+ if (size < PERF_ATTR_SIZE_VER0)
+ goto err_size;
+
+ /*
+ * If we're handed a bigger struct than we know of,
+ * ensure all the unknown bits are 0.
+ */
+ if (size > sizeof(*attr)) {
+ unsigned long val;
+ unsigned long __user *addr;
+ unsigned long __user *end;
+
+ addr = PTR_ALIGN((void __user *)uattr + sizeof(*attr),
+ sizeof(unsigned long));
+ end = PTR_ALIGN((void __user *)uattr + size,
+ sizeof(unsigned long));
+
+ for (; addr < end; addr += sizeof(unsigned long)) {
+ ret = get_user(val, addr);
+ if (ret)
+ return ret;
+ if (val)
+ goto err_size;
+ }
+ }
+
+ ret = copy_from_user(attr, uattr, size);
+ if (ret)
+ return -EFAULT;
+
+ /*
+ * If the type exists, the corresponding creation will verify
+ * the attr->config.
+ */
+ if (attr->type >= PERF_TYPE_MAX)
+ return -EINVAL;
+
+ if (attr->__reserved_1 || attr->__reserved_2 || attr->__reserved_3)
+ return -EINVAL;
+
+ if (attr->sample_type & ~(PERF_SAMPLE_MAX-1))
+ return -EINVAL;
+
+ if (attr->read_format & ~(PERF_FORMAT_MAX-1))
+ return -EINVAL;
+
+out:
+ return ret;
+
+err_size:
+ put_user(sizeof(*attr), &uattr->size);
+ ret = -E2BIG;
+ goto out;
+}
+
/**
- * sys_perf_task_open - open a performance counter, associate it to a task/cpu
+ * sys_perf_counter_open - open a performance counter, associate it to a task/cpu
*
- * @hw_event_uptr: event type attributes for monitoring/sampling
+ * @attr_uptr: event type attributes for monitoring/sampling
* @pid: target pid
* @cpu: target cpu
* @group_fd: group leader counter fd
*/
-asmlinkage int
-sys_perf_counter_open(struct perf_counter_hw_event *hw_event_uptr __user,
- pid_t pid, int cpu, int group_fd)
+SYSCALL_DEFINE5(perf_counter_open,
+ struct perf_counter_attr __user *, attr_uptr,
+ pid_t, pid, int, cpu, int, group_fd, unsigned long, flags)
{
struct perf_counter *counter, *group_leader;
- struct perf_counter_hw_event hw_event;
+ struct perf_counter_attr attr;
struct perf_counter_context *ctx;
struct file *counter_file = NULL;
struct file *group_file = NULL;
int fput_needed2 = 0;
int ret;
- if (copy_from_user(&hw_event, hw_event_uptr, sizeof(hw_event)) != 0)
- return -EFAULT;
+ /* for future expandability... */
+ if (flags)
+ return -EINVAL;
+
+ ret = perf_copy_attr(attr_uptr, &attr);
+ if (ret)
+ return ret;
+
+ if (!attr.exclude_kernel) {
+ if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ }
+
+ if (attr.freq) {
+ if (attr.sample_freq > sysctl_perf_counter_sample_rate)
+ return -EINVAL;
+ }
/*
* Get the target context (task or percpu):
*/
if (group_leader->ctx != ctx)
goto err_put_context;
+ /*
+ * Only a group leader can be exclusive or pinned
+ */
+ if (attr.exclusive || attr.pinned)
+ goto err_put_context;
}
- ret = -EINVAL;
- counter = perf_counter_alloc(&hw_event, cpu, group_leader, GFP_KERNEL);
- if (!counter)
+ counter = perf_counter_alloc(&attr, cpu, ctx, group_leader,
+ NULL, GFP_KERNEL);
+ ret = PTR_ERR(counter);
+ if (IS_ERR(counter))
goto err_put_context;
ret = anon_inode_getfd("[perf_counter]", &perf_fops, counter, 0);
goto err_free_put_context;
counter->filp = counter_file;
+ WARN_ON_ONCE(ctx->parent_ctx);
+ mutex_lock(&ctx->mutex);
perf_install_in_context(ctx, counter, cpu);
+ ++ctx->generation;
+ mutex_unlock(&ctx->mutex);
+
+ counter->owner = current;
+ get_task_struct(current);
+ mutex_lock(¤t->perf_counter_mutex);
+ list_add_tail(&counter->owner_entry, ¤t->perf_counter_list);
+ mutex_unlock(¤t->perf_counter_mutex);
fput_light(counter_file, fput_needed2);
kfree(counter);
err_put_context:
- put_context(ctx);
+ put_ctx(ctx);
goto out_fput;
}
/*
- * Initialize the perf_counter context in a task_struct:
- */
-static void
-__perf_counter_init_context(struct perf_counter_context *ctx,
- struct task_struct *task)
-{
- memset(ctx, 0, sizeof(*ctx));
- spin_lock_init(&ctx->lock);
- INIT_LIST_HEAD(&ctx->counter_list);
- ctx->task = task;
-}
-
-/*
* inherit a counter from parent task to child task:
*/
-static int
+static struct perf_counter *
inherit_counter(struct perf_counter *parent_counter,
struct task_struct *parent,
struct perf_counter_context *parent_ctx,
struct task_struct *child,
+ struct perf_counter *group_leader,
struct perf_counter_context *child_ctx)
{
struct perf_counter *child_counter;
- child_counter = perf_counter_alloc(&parent_counter->hw_event,
- parent_counter->cpu, NULL,
- GFP_ATOMIC);
- if (!child_counter)
- return -ENOMEM;
+ /*
+ * Instead of creating recursive hierarchies of counters,
+ * we link inherited counters back to the original parent,
+ * which has a filp for sure, which we use as the reference
+ * count:
+ */
+ if (parent_counter->parent)
+ parent_counter = parent_counter->parent;
+
+ child_counter = perf_counter_alloc(&parent_counter->attr,
+ parent_counter->cpu, child_ctx,
+ group_leader, parent_counter,
+ GFP_KERNEL);
+ if (IS_ERR(child_counter))
+ return child_counter;
+ get_ctx(child_ctx);
/*
- * Link it up in the child's context:
+ * Make the child state follow the state of the parent counter,
+ * not its attr.disabled bit. We hold the parent's mutex,
+ * so we won't race with perf_counter_{en, dis}able_family.
*/
- child_counter->ctx = child_ctx;
- child_counter->task = child;
- list_add_counter(child_counter, child_ctx);
- child_ctx->nr_counters++;
+ if (parent_counter->state >= PERF_COUNTER_STATE_INACTIVE)
+ child_counter->state = PERF_COUNTER_STATE_INACTIVE;
+ else
+ child_counter->state = PERF_COUNTER_STATE_OFF;
+
+ if (parent_counter->attr.freq)
+ child_counter->hw.sample_period = parent_counter->hw.sample_period;
- child_counter->parent = parent_counter;
/*
- * inherit into child's child as well:
+ * Link it up in the child's context:
*/
- child_counter->hw_event.inherit = 1;
+ add_counter_to_ctx(child_counter, child_ctx);
/*
* Get a reference to the parent filp - we will fput it
*/
atomic_long_inc(&parent_counter->filp->f_count);
+ /*
+ * Link this into the parent counter's child list
+ */
+ WARN_ON_ONCE(parent_counter->ctx->parent_ctx);
+ mutex_lock(&parent_counter->child_mutex);
+ list_add_tail(&child_counter->child_list, &parent_counter->child_list);
+ mutex_unlock(&parent_counter->child_mutex);
+
+ return child_counter;
+}
+
+static int inherit_group(struct perf_counter *parent_counter,
+ struct task_struct *parent,
+ struct perf_counter_context *parent_ctx,
+ struct task_struct *child,
+ struct perf_counter_context *child_ctx)
+{
+ struct perf_counter *leader;
+ struct perf_counter *sub;
+ struct perf_counter *child_ctr;
+
+ leader = inherit_counter(parent_counter, parent, parent_ctx,
+ child, NULL, child_ctx);
+ if (IS_ERR(leader))
+ return PTR_ERR(leader);
+ list_for_each_entry(sub, &parent_counter->sibling_list, list_entry) {
+ child_ctr = inherit_counter(sub, parent, parent_ctx,
+ child, leader, child_ctx);
+ if (IS_ERR(child_ctr))
+ return PTR_ERR(child_ctr);
+ }
return 0;
}
-static void
-__perf_counter_exit_task(struct task_struct *child,
- struct perf_counter *child_counter,
- struct perf_counter_context *child_ctx)
+static void sync_child_counter(struct perf_counter *child_counter,
+ struct task_struct *child)
{
- struct perf_counter *parent_counter;
- u64 parent_val, child_val;
+ struct perf_counter *parent_counter = child_counter->parent;
+ u64 child_val;
- /*
- * If we do not self-reap then we have to wait for the
- * child task to unschedule (it will happen for sure),
- * so that its counter is at its final count. (This
- * condition triggers rarely - child tasks usually get
- * off their CPU before the parent has a chance to
- * get this far into the reaping action)
- */
- if (child != current) {
- wait_task_inactive(child, 0);
- list_del_init(&child_counter->list_entry);
- } else {
- struct perf_cpu_context *cpuctx;
- unsigned long flags;
- u64 perf_flags;
+ if (child_counter->attr.inherit_stat)
+ perf_counter_read_event(child_counter, child);
- /*
- * Disable and unlink this counter.
- *
- * Be careful about zapping the list - IRQ/NMI context
- * could still be processing it:
- */
- curr_rq_lock_irq_save(&flags);
- perf_flags = hw_perf_save_disable();
+ child_val = atomic64_read(&child_counter->count);
- cpuctx = &__get_cpu_var(perf_cpu_context);
+ /*
+ * Add back the child's count to the parent's count:
+ */
+ atomic64_add(child_val, &parent_counter->count);
+ atomic64_add(child_counter->total_time_enabled,
+ &parent_counter->child_total_time_enabled);
+ atomic64_add(child_counter->total_time_running,
+ &parent_counter->child_total_time_running);
- if (child_counter->state == PERF_COUNTER_STATE_ACTIVE) {
- child_counter->state = PERF_COUNTER_STATE_INACTIVE;
- child_counter->hw_ops->disable(child_counter);
- cpuctx->active_oncpu--;
- child_ctx->nr_active--;
- child_counter->oncpu = -1;
- }
+ /*
+ * Remove this counter from the parent's list
+ */
+ WARN_ON_ONCE(parent_counter->ctx->parent_ctx);
+ mutex_lock(&parent_counter->child_mutex);
+ list_del_init(&child_counter->child_list);
+ mutex_unlock(&parent_counter->child_mutex);
- list_del_init(&child_counter->list_entry);
+ /*
+ * Release the parent counter, if this was the last
+ * reference to it.
+ */
+ fput(parent_counter->filp);
+}
- child_ctx->nr_counters--;
+static void
+__perf_counter_exit_task(struct perf_counter *child_counter,
+ struct perf_counter_context *child_ctx,
+ struct task_struct *child)
+{
+ struct perf_counter *parent_counter;
- hw_perf_restore(perf_flags);
- curr_rq_unlock_irq_restore(&flags);
- }
+ update_counter_times(child_counter);
+ perf_counter_remove_from_context(child_counter);
parent_counter = child_counter->parent;
/*
* that are still around due to the child reference. These
* counters need to be zapped - but otherwise linger.
*/
- if (!parent_counter)
+ if (parent_counter) {
+ sync_child_counter(child_counter, child);
+ free_counter(child_counter);
+ }
+}
+
+/*
+ * When a child task exits, feed back counter values to parent counters.
+ */
+void perf_counter_exit_task(struct task_struct *child)
+{
+ struct perf_counter *child_counter, *tmp;
+ struct perf_counter_context *child_ctx;
+ unsigned long flags;
+
+ if (likely(!child->perf_counter_ctxp))
return;
- parent_val = atomic64_read(&parent_counter->count);
- child_val = atomic64_read(&child_counter->count);
+ local_irq_save(flags);
+ /*
+ * We can't reschedule here because interrupts are disabled,
+ * and either child is current or it is a task that can't be
+ * scheduled, so we are now safe from rescheduling changing
+ * our context.
+ */
+ child_ctx = child->perf_counter_ctxp;
+ __perf_counter_task_sched_out(child_ctx);
/*
- * Add back the child's count to the parent's count:
+ * Take the context lock here so that if find_get_context is
+ * reading child->perf_counter_ctxp, we wait until it has
+ * incremented the context's refcount before we do put_ctx below.
*/
- atomic64_add(child_val, &parent_counter->count);
+ spin_lock(&child_ctx->lock);
+ child->perf_counter_ctxp = NULL;
+ /*
+ * If this context is a clone; unclone it so it can't get
+ * swapped to another process while we're removing all
+ * the counters from it.
+ */
+ unclone_ctx(child_ctx);
+ spin_unlock(&child_ctx->lock);
+ local_irq_restore(flags);
- fput(parent_counter->filp);
+ /*
+ * We can recurse on the same lock type through:
+ *
+ * __perf_counter_exit_task()
+ * sync_child_counter()
+ * fput(parent_counter->filp)
+ * perf_release()
+ * mutex_lock(&ctx->mutex)
+ *
+ * But since its the parent context it won't be the same instance.
+ */
+ mutex_lock_nested(&child_ctx->mutex, SINGLE_DEPTH_NESTING);
+
+again:
+ list_for_each_entry_safe(child_counter, tmp, &child_ctx->counter_list,
+ list_entry)
+ __perf_counter_exit_task(child_counter, child_ctx, child);
+
+ /*
+ * If the last counter was a group counter, it will have appended all
+ * its siblings to the list, but we obtained 'tmp' before that which
+ * will still point to the list head terminating the iteration.
+ */
+ if (!list_empty(&child_ctx->counter_list))
+ goto again;
+
+ mutex_unlock(&child_ctx->mutex);
- kfree(child_counter);
+ put_ctx(child_ctx);
}
/*
- * When a child task exist, feed back counter values to parent counters.
- *
- * Note: we are running in child context, but the PID is not hashed
- * anymore so new counters will not be added.
+ * free an unexposed, unused context as created by inheritance by
+ * init_task below, used by fork() in case of fail.
*/
-void perf_counter_exit_task(struct task_struct *child)
+void perf_counter_free_task(struct task_struct *task)
{
- struct perf_counter *child_counter, *tmp;
- struct perf_counter_context *child_ctx;
-
- child_ctx = &child->perf_counter_ctx;
+ struct perf_counter_context *ctx = task->perf_counter_ctxp;
+ struct perf_counter *counter, *tmp;
- if (likely(!child_ctx->nr_counters))
+ if (!ctx)
return;
- list_for_each_entry_safe(child_counter, tmp, &child_ctx->counter_list,
- list_entry)
- __perf_counter_exit_task(child, child_counter, child_ctx);
+ mutex_lock(&ctx->mutex);
+again:
+ list_for_each_entry_safe(counter, tmp, &ctx->counter_list, list_entry) {
+ struct perf_counter *parent = counter->parent;
+
+ if (WARN_ON_ONCE(!parent))
+ continue;
+
+ mutex_lock(&parent->child_mutex);
+ list_del_init(&counter->child_list);
+ mutex_unlock(&parent->child_mutex);
+
+ fput(parent->filp);
+
+ list_del_counter(counter, ctx);
+ free_counter(counter);
+ }
+
+ if (!list_empty(&ctx->counter_list))
+ goto again;
+
+ mutex_unlock(&ctx->mutex);
+
+ put_ctx(ctx);
}
/*
* Initialize the perf_counter context in task_struct
*/
-void perf_counter_init_task(struct task_struct *child)
+int perf_counter_init_task(struct task_struct *child)
{
struct perf_counter_context *child_ctx, *parent_ctx;
- struct perf_counter *counter, *parent_counter;
+ struct perf_counter_context *cloned_ctx;
+ struct perf_counter *counter;
struct task_struct *parent = current;
- unsigned long flags;
+ int inherited_all = 1;
+ int ret = 0;
- child_ctx = &child->perf_counter_ctx;
- parent_ctx = &parent->perf_counter_ctx;
+ child->perf_counter_ctxp = NULL;
- __perf_counter_init_context(child_ctx, child);
+ mutex_init(&child->perf_counter_mutex);
+ INIT_LIST_HEAD(&child->perf_counter_list);
+
+ if (likely(!parent->perf_counter_ctxp))
+ return 0;
/*
* This is executed from the parent task context, so inherit
- * counters that have been marked for cloning:
+ * counters that have been marked for cloning.
+ * First allocate and initialize a context for the child.
*/
- if (likely(!parent_ctx->nr_counters))
- return;
+ child_ctx = kmalloc(sizeof(struct perf_counter_context), GFP_KERNEL);
+ if (!child_ctx)
+ return -ENOMEM;
+
+ __perf_counter_init_context(child_ctx, child);
+ child->perf_counter_ctxp = child_ctx;
+ get_task_struct(child);
+
+ /*
+ * If the parent's context is a clone, pin it so it won't get
+ * swapped under us.
+ */
+ parent_ctx = perf_pin_task_context(parent);
+
+ /*
+ * No need to check if parent_ctx != NULL here; since we saw
+ * it non-NULL earlier, the only reason for it to become NULL
+ * is if we exit, and since we're currently in the middle of
+ * a fork we can't be exiting at the same time.
+ */
/*
* Lock the parent list. No need to lock the child - not PID
* hashed yet and not running, so nobody can access it.
*/
- spin_lock_irqsave(&parent_ctx->lock, flags);
+ mutex_lock(&parent_ctx->mutex);
/*
* We dont have to disable NMIs - we are only looking at
* the list, not manipulating it:
*/
- list_for_each_entry(counter, &parent_ctx->counter_list, list_entry) {
- if (!counter->hw_event.inherit || counter->group_leader != counter)
+ list_for_each_entry_rcu(counter, &parent_ctx->event_list, event_entry) {
+ if (counter != counter->group_leader)
continue;
- /*
- * Instead of creating recursive hierarchies of counters,
- * we link inheritd counters back to the original parent,
- * which has a filp for sure, which we use as the reference
- * count:
- */
- parent_counter = counter;
- if (counter->parent)
- parent_counter = counter->parent;
+ if (!counter->attr.inherit) {
+ inherited_all = 0;
+ continue;
+ }
- if (inherit_counter(parent_counter, parent,
- parent_ctx, child, child_ctx))
+ ret = inherit_group(counter, parent, parent_ctx,
+ child, child_ctx);
+ if (ret) {
+ inherited_all = 0;
break;
+ }
}
- spin_unlock_irqrestore(&parent_ctx->lock, flags);
+ if (inherited_all) {
+ /*
+ * Mark the child context as a clone of the parent
+ * context, or of whatever the parent is a clone of.
+ * Note that if the parent is a clone, it could get
+ * uncloned at any point, but that doesn't matter
+ * because the list of counters and the generation
+ * count can't have changed since we took the mutex.
+ */
+ cloned_ctx = rcu_dereference(parent_ctx->parent_ctx);
+ if (cloned_ctx) {
+ child_ctx->parent_ctx = cloned_ctx;
+ child_ctx->parent_gen = parent_ctx->parent_gen;
+ } else {
+ child_ctx->parent_ctx = parent_ctx;
+ child_ctx->parent_gen = parent_ctx->generation;
+ }
+ get_ctx(child_ctx->parent_ctx);
+ }
+
+ mutex_unlock(&parent_ctx->mutex);
+
+ perf_unpin_context(parent_ctx);
+
+ return ret;
}
static void __cpuinit perf_counter_init_cpu(int cpu)
cpuctx = &per_cpu(perf_cpu_context, cpu);
__perf_counter_init_context(&cpuctx->ctx, NULL);
- mutex_lock(&perf_resource_mutex);
+ spin_lock(&perf_resource_lock);
cpuctx->max_pertask = perf_max_counters - perf_reserved_percpu;
- mutex_unlock(&perf_resource_mutex);
+ spin_unlock(&perf_resource_lock);
- hw_perf_counter_setup();
+ hw_perf_counter_setup(cpu);
}
#ifdef CONFIG_HOTPLUG_CPU
list_for_each_entry_safe(counter, tmp, &ctx->counter_list, list_entry)
__perf_counter_remove_from_context(counter);
-
}
static void perf_counter_exit_cpu(int cpu)
{
+ struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+ struct perf_counter_context *ctx = &cpuctx->ctx;
+
+ mutex_lock(&ctx->mutex);
smp_call_function_single(cpu, __perf_counter_exit_cpu, NULL, 1);
+ mutex_unlock(&ctx->mutex);
}
#else
static inline void perf_counter_exit_cpu(int cpu) { }
return NOTIFY_OK;
}
+/*
+ * This has to have a higher priority than migration_notifier in sched.c.
+ */
static struct notifier_block __cpuinitdata perf_cpu_nb = {
.notifier_call = perf_cpu_notify,
+ .priority = 20,
};
-static int __init perf_counter_init(void)
+void __init perf_counter_init(void)
{
perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_UP_PREPARE,
(void *)(long)smp_processor_id());
register_cpu_notifier(&perf_cpu_nb);
-
- return 0;
}
-early_initcall(perf_counter_init);
static ssize_t perf_show_reserve_percpu(struct sysdev_class *class, char *buf)
{
if (val > perf_max_counters)
return -EINVAL;
- mutex_lock(&perf_resource_mutex);
+ spin_lock(&perf_resource_lock);
perf_reserved_percpu = val;
for_each_online_cpu(cpu) {
cpuctx = &per_cpu(perf_cpu_context, cpu);
cpuctx->max_pertask = mpt;
spin_unlock_irq(&cpuctx->ctx.lock);
}
- mutex_unlock(&perf_resource_mutex);
+ spin_unlock(&perf_resource_lock);
return count;
}
if (val > 1)
return -EINVAL;
- mutex_lock(&perf_resource_mutex);
+ spin_lock(&perf_resource_lock);
perf_overcommit = val;
- mutex_unlock(&perf_resource_mutex);
+ spin_unlock(&perf_resource_lock);
return count;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff