* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
+ * @author Barry Kasindorf <barry.kasindorf@amd.com>
*
* Each CPU has a local buffer that stores PC value/event
* pairs. We also log context switches when we notice them.
#include <linux/oprofile.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
-
+
#include "event_buffer.h"
#include "cpu_buffer.h"
#include "buffer_sync.h"
#include "oprof.h"
-struct oprofile_cpu_buffer cpu_buffer[NR_CPUS] __cacheline_aligned;
+DEFINE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
-static void wq_sync_buffer(void *);
+static void wq_sync_buffer(struct work_struct *work);
#define DEFAULT_TIMER_EXPIRE (HZ / 10)
static int work_enabled;
void free_cpu_buffers(void)
{
int i;
-
- for_each_online_cpu(i) {
- vfree(cpu_buffer[i].buffer);
+
+ for_each_possible_cpu(i) {
+ vfree(per_cpu(cpu_buffer, i).buffer);
+ per_cpu(cpu_buffer, i).buffer = NULL;
}
}
+unsigned long oprofile_get_cpu_buffer_size(void)
+{
+ return fs_cpu_buffer_size;
+}
+
+void oprofile_cpu_buffer_inc_smpl_lost(void)
+{
+ struct oprofile_cpu_buffer *cpu_buf
+ = &__get_cpu_var(cpu_buffer);
+
+ cpu_buf->sample_lost_overflow++;
+}
+
int alloc_cpu_buffers(void)
{
int i;
-
+
unsigned long buffer_size = fs_cpu_buffer_size;
-
- for_each_online_cpu(i) {
- struct oprofile_cpu_buffer * b = &cpu_buffer[i];
-
- b->buffer = vmalloc(sizeof(struct op_sample) * buffer_size);
+
+ for_each_possible_cpu(i) {
+ struct oprofile_cpu_buffer *b = &per_cpu(cpu_buffer, i);
+
+ b->buffer = vmalloc_node(sizeof(struct op_sample) * buffer_size,
+ cpu_to_node(i));
if (!b->buffer)
goto fail;
-
+
b->last_task = NULL;
b->last_is_kernel = -1;
b->tracing = 0;
b->head_pos = 0;
b->sample_received = 0;
b->sample_lost_overflow = 0;
+ b->backtrace_aborted = 0;
+ b->sample_invalid_eip = 0;
b->cpu = i;
- INIT_WORK(&b->work, wq_sync_buffer, b);
+ INIT_DELAYED_WORK(&b->work, wq_sync_buffer);
}
return 0;
work_enabled = 1;
for_each_online_cpu(i) {
- struct oprofile_cpu_buffer * b = &cpu_buffer[i];
+ struct oprofile_cpu_buffer *b = &per_cpu(cpu_buffer, i);
/*
* Spread the work by 1 jiffy per cpu so they dont all
work_enabled = 0;
for_each_online_cpu(i) {
- struct oprofile_cpu_buffer * b = &cpu_buffer[i];
+ struct oprofile_cpu_buffer *b = &per_cpu(cpu_buffer, i);
cancel_delayed_work(&b->work);
}
flush_scheduled_work();
}
-/* Resets the cpu buffer to a sane state. */
-void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf)
-{
- /* reset these to invalid values; the next sample
- * collected will populate the buffer with proper
- * values to initialize the buffer
- */
- cpu_buf->last_is_kernel = -1;
- cpu_buf->last_task = NULL;
-}
-
/* compute number of available slots in cpu_buffer queue */
-static unsigned long nr_available_slots(struct oprofile_cpu_buffer const * b)
+static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
{
unsigned long head = b->head_pos;
unsigned long tail = b->tail_pos;
return tail + (b->buffer_size - head) - 1;
}
-static void increment_head(struct oprofile_cpu_buffer * b)
-{
- unsigned long new_head = b->head_pos + 1;
-
- /* Ensure anything written to the slot before we
- * increment is visible */
- wmb();
-
- if (new_head < b->buffer_size)
- b->head_pos = new_head;
- else
- b->head_pos = 0;
-}
-
static inline void
-add_sample(struct oprofile_cpu_buffer * cpu_buf,
- unsigned long pc, unsigned long event)
+add_sample(struct oprofile_cpu_buffer *cpu_buf,
+ unsigned long pc, unsigned long event)
{
- struct op_sample * entry = &cpu_buf->buffer[cpu_buf->head_pos];
+ struct op_sample *entry = cpu_buffer_write_entry(cpu_buf);
entry->eip = pc;
entry->event = event;
- increment_head(cpu_buf);
+ cpu_buffer_write_commit(cpu_buf);
}
static inline void
-add_code(struct oprofile_cpu_buffer * buffer, unsigned long value)
+add_code(struct oprofile_cpu_buffer *buffer, unsigned long value)
{
add_sample(buffer, ESCAPE_CODE, value);
}
* pc. We tag this in the buffer by generating kernel enter/exit
* events whenever is_kernel changes
*/
-static int log_sample(struct oprofile_cpu_buffer * cpu_buf, unsigned long pc,
+static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
int is_kernel, unsigned long event)
{
- struct task_struct * task;
+ struct task_struct *task;
cpu_buf->sample_received++;
+ if (pc == ESCAPE_CODE) {
+ cpu_buf->sample_invalid_eip++;
+ return 0;
+ }
+
if (nr_available_slots(cpu_buf) < 3) {
cpu_buf->sample_lost_overflow++;
return 0;
cpu_buf->last_task = task;
add_code(cpu_buf, (unsigned long)task);
}
-
+
add_sample(cpu_buf, pc, event);
return 1;
}
-static int oprofile_begin_trace(struct oprofile_cpu_buffer * cpu_buf)
+static int oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
{
if (nr_available_slots(cpu_buf) < 4) {
cpu_buf->sample_lost_overflow++;
return 1;
}
-static void oprofile_end_trace(struct oprofile_cpu_buffer * cpu_buf)
+static void oprofile_end_trace(struct oprofile_cpu_buffer *cpu_buf)
{
cpu_buf->tracing = 0;
}
-void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
+void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
+ unsigned long event, int is_kernel)
{
- struct oprofile_cpu_buffer * cpu_buf = &cpu_buffer[smp_processor_id()];
- unsigned long pc = profile_pc(regs);
- int is_kernel = !user_mode(regs);
+ struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
if (!backtrace_depth) {
log_sample(cpu_buf, pc, is_kernel, event);
if (!oprofile_begin_trace(cpu_buf))
return;
- /* if log_sample() fail we can't backtrace since we lost the source
- * of this event */
+ /*
+ * if log_sample() fail we can't backtrace since we lost the
+ * source of this event
+ */
if (log_sample(cpu_buf, pc, is_kernel, event))
oprofile_ops.backtrace(regs, backtrace_depth);
oprofile_end_trace(cpu_buf);
}
+void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
+{
+ int is_kernel = !user_mode(regs);
+ unsigned long pc = profile_pc(regs);
+
+ oprofile_add_ext_sample(pc, regs, event, is_kernel);
+}
+
+#ifdef CONFIG_OPROFILE_IBS
+
+#define MAX_IBS_SAMPLE_SIZE 14
+
+void oprofile_add_ibs_sample(struct pt_regs * const regs,
+ unsigned int * const ibs_sample, int ibs_code)
+{
+ int is_kernel = !user_mode(regs);
+ struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
+ struct task_struct *task;
+
+ cpu_buf->sample_received++;
+
+ if (nr_available_slots(cpu_buf) < MAX_IBS_SAMPLE_SIZE) {
+ /* we can't backtrace since we lost the source of this event */
+ cpu_buf->sample_lost_overflow++;
+ return;
+ }
+
+ /* notice a switch from user->kernel or vice versa */
+ if (cpu_buf->last_is_kernel != is_kernel) {
+ cpu_buf->last_is_kernel = is_kernel;
+ add_code(cpu_buf, is_kernel);
+ }
+
+ /* notice a task switch */
+ if (!is_kernel) {
+ task = current;
+ if (cpu_buf->last_task != task) {
+ cpu_buf->last_task = task;
+ add_code(cpu_buf, (unsigned long)task);
+ }
+ }
+
+ add_code(cpu_buf, ibs_code);
+ add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
+ add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
+ add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
+
+ if (ibs_code == IBS_OP_BEGIN) {
+ add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
+ add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
+ add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
+ }
+
+ if (backtrace_depth)
+ oprofile_ops.backtrace(regs, backtrace_depth);
+}
+
+#endif
+
void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)
{
- struct oprofile_cpu_buffer * cpu_buf = &cpu_buffer[smp_processor_id()];
+ struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
log_sample(cpu_buf, pc, is_kernel, event);
}
void oprofile_add_trace(unsigned long pc)
{
- struct oprofile_cpu_buffer * cpu_buf = &cpu_buffer[smp_processor_id()];
+ struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
if (!cpu_buf->tracing)
return;
return;
}
- /* broken frame can give an eip with the same value as an escape code,
- * abort the trace if we get it */
+ /*
+ * broken frame can give an eip with the same value as an
+ * escape code, abort the trace if we get it
+ */
if (pc == ESCAPE_CODE) {
cpu_buf->tracing = 0;
cpu_buf->backtrace_aborted++;
* By using schedule_delayed_work_on and then schedule_delayed_work
* we guarantee this will stay on the correct cpu
*/
-static void wq_sync_buffer(void * data)
+static void wq_sync_buffer(struct work_struct *work)
{
- struct oprofile_cpu_buffer * b = data;
+ struct oprofile_cpu_buffer *b =
+ container_of(work, struct oprofile_cpu_buffer, work.work);
if (b->cpu != smp_processor_id()) {
- printk("WQ on CPU%d, prefer CPU%d\n",
+ printk(KERN_DEBUG "WQ on CPU%d, prefer CPU%d\n",
smp_processor_id(), b->cpu);
+
+ if (!cpu_online(b->cpu)) {
+ cancel_delayed_work(&b->work);
+ return;
+ }
}
sync_buffer(b->cpu);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff