#include <linux/sched.h>
#include <linux/oprofile.h>
-#include <linux/vmalloc.h>
#include <linux/errno.h>
#include "event_buffer.h"
op_ring_buffer_write = NULL;
}
+#define RB_EVENT_HDR_SIZE 4
+
int alloc_cpu_buffers(void)
{
int i;
unsigned long buffer_size = oprofile_cpu_buffer_size;
+ unsigned long byte_size = buffer_size * (sizeof(struct op_sample) +
+ RB_EVENT_HDR_SIZE);
- op_ring_buffer_read = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
+ op_ring_buffer_read = ring_buffer_alloc(byte_size, OP_BUFFER_FLAGS);
if (!op_ring_buffer_read)
goto fail;
- op_ring_buffer_write = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
+ op_ring_buffer_write = ring_buffer_alloc(byte_size, OP_BUFFER_FLAGS);
if (!op_ring_buffer_write)
goto fail;
{
entry->event = ring_buffer_lock_reserve
(op_ring_buffer_write, sizeof(struct op_sample) +
- size * sizeof(entry->sample->data[0]), &entry->irq_flags);
+ size * sizeof(entry->sample->data[0]));
if (entry->event)
entry->sample = ring_buffer_event_data(entry->event);
else
int op_cpu_buffer_write_commit(struct op_entry *entry)
{
- return ring_buffer_unlock_commit(op_ring_buffer_write, entry->event,
- entry->irq_flags);
+ return ring_buffer_unlock_commit(op_ring_buffer_write, entry->event);
}
-struct op_sample *op_cpu_buffer_read_entry(int cpu)
+struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu)
{
struct ring_buffer_event *e;
e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
if (e)
- return ring_buffer_event_data(e);
+ goto event;
if (ring_buffer_swap_cpu(op_ring_buffer_read,
op_ring_buffer_write,
cpu))
return NULL;
e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
if (e)
- return ring_buffer_event_data(e);
+ goto event;
return NULL;
+
+event:
+ entry->event = e;
+ entry->sample = ring_buffer_event_data(e);
+ entry->size = (ring_buffer_event_length(e) - sizeof(struct op_sample))
+ / sizeof(entry->sample->data[0]);
+ entry->data = entry->sample->data;
+ return entry->sample;
}
unsigned long op_cpu_buffer_entries(int cpu)
+ ring_buffer_entries_cpu(op_ring_buffer_write, cpu);
}
+static int
+op_add_code(struct oprofile_cpu_buffer *cpu_buf, unsigned long backtrace,
+ int is_kernel, struct task_struct *task)
+{
+ struct op_entry entry;
+ struct op_sample *sample;
+ unsigned long flags;
+ int size;
+
+ flags = 0;
+
+ if (backtrace)
+ flags |= TRACE_BEGIN;
+
+ /* notice a switch from user->kernel or vice versa */
+ is_kernel = !!is_kernel;
+ if (cpu_buf->last_is_kernel != is_kernel) {
+ cpu_buf->last_is_kernel = is_kernel;
+ flags |= KERNEL_CTX_SWITCH;
+ if (is_kernel)
+ flags |= IS_KERNEL;
+ }
+
+ /* notice a task switch */
+ if (cpu_buf->last_task != task) {
+ cpu_buf->last_task = task;
+ flags |= USER_CTX_SWITCH;
+ }
+
+ if (!flags)
+ /* nothing to do */
+ return 0;
+
+ if (flags & USER_CTX_SWITCH)
+ size = 1;
+ else
+ size = 0;
+
+ sample = op_cpu_buffer_write_reserve(&entry, size);
+ if (!sample)
+ return -ENOMEM;
+
+ sample->eip = ESCAPE_CODE;
+ sample->event = flags;
+
+ if (size)
+ op_cpu_buffer_add_data(&entry, (unsigned long)task);
+
+ op_cpu_buffer_write_commit(&entry);
+
+ return 0;
+}
+
static inline int
op_add_sample(struct oprofile_cpu_buffer *cpu_buf,
unsigned long pc, unsigned long event)
return op_cpu_buffer_write_commit(&entry);
}
-static inline int
-add_code(struct oprofile_cpu_buffer *buffer, unsigned long value)
-{
- return op_add_sample(buffer, ESCAPE_CODE, value);
-}
-
-/* This must be safe from any context. It's safe writing here
- * because of the head/tail separation of the writer and reader
- * of the CPU buffer.
+/*
+ * This must be safe from any context.
*
* is_kernel is needed because on some architectures you cannot
* tell if you are in kernel or user space simply by looking at
* 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,
- int is_kernel, unsigned long event)
+static int
+log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
+ unsigned long backtrace, int is_kernel, unsigned long event)
{
- struct task_struct *task;
-
cpu_buf->sample_received++;
if (pc == ESCAPE_CODE) {
return 0;
}
- is_kernel = !!is_kernel;
-
- task = current;
-
- /* notice a switch from user->kernel or vice versa */
- if (cpu_buf->last_is_kernel != is_kernel) {
- cpu_buf->last_is_kernel = is_kernel;
- if (add_code(cpu_buf, is_kernel))
- goto fail;
- }
-
- /* notice a task switch */
- if (cpu_buf->last_task != task) {
- cpu_buf->last_task = task;
- if (add_code(cpu_buf, (unsigned long)task))
- goto fail;
- }
+ if (op_add_code(cpu_buf, backtrace, is_kernel, current))
+ goto fail;
if (op_add_sample(cpu_buf, pc, event))
goto fail;
static inline void oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
{
- add_code(cpu_buf, CPU_TRACE_BEGIN);
cpu_buf->tracing = 1;
}
unsigned long event, int is_kernel)
{
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
-
- if (!oprofile_backtrace_depth) {
- log_sample(cpu_buf, pc, is_kernel, event);
- return;
- }
-
- oprofile_begin_trace(cpu_buf);
+ unsigned long backtrace = oprofile_backtrace_depth;
/*
* 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, oprofile_backtrace_depth);
+ if (!log_sample(cpu_buf, pc, backtrace, is_kernel, event))
+ /* failed */
+ return;
+
+ if (!backtrace)
+ return;
+ oprofile_begin_trace(cpu_buf);
+ oprofile_ops.backtrace(regs, backtrace);
oprofile_end_trace(cpu_buf);
}
__oprofile_add_ext_sample(pc, regs, event, is_kernel);
}
-#ifdef CONFIG_OPROFILE_IBS
-
-void oprofile_add_ibs_sample(struct pt_regs * const regs,
- unsigned int * const ibs_sample, int ibs_code)
+/*
+ * Add samples with data to the ring buffer.
+ *
+ * Use oprofile_add_data(&entry, val) to add data and
+ * oprofile_write_commit(&entry) to commit the sample.
+ */
+void
+oprofile_write_reserve(struct op_entry *entry, struct pt_regs * const regs,
+ unsigned long pc, int code, int size)
{
+ struct op_sample *sample;
int is_kernel = !user_mode(regs);
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
- struct task_struct *task;
- int fail = 0;
cpu_buf->sample_received++;
- /* notice a switch from user->kernel or vice versa */
- if (cpu_buf->last_is_kernel != is_kernel) {
- if (add_code(cpu_buf, is_kernel))
- goto fail;
- cpu_buf->last_is_kernel = is_kernel;
- }
-
- /* notice a task switch */
- if (!is_kernel) {
- task = current;
- if (cpu_buf->last_task != task) {
- if (add_code(cpu_buf, (unsigned long)task))
- goto fail;
- cpu_buf->last_task = task;
- }
- }
+ /* no backtraces for samples with data */
+ if (op_add_code(cpu_buf, 0, is_kernel, current))
+ goto fail;
- fail = fail || add_code(cpu_buf, ibs_code);
- fail = fail || op_add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
- fail = fail || op_add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
- fail = fail || op_add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
+ sample = op_cpu_buffer_write_reserve(entry, size + 2);
+ if (!sample)
+ goto fail;
+ sample->eip = ESCAPE_CODE;
+ sample->event = 0; /* no flags */
- if (ibs_code == IBS_OP_BEGIN) {
- fail = fail || op_add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
- fail = fail || op_add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
- fail = fail || op_add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
- }
+ op_cpu_buffer_add_data(entry, code);
+ op_cpu_buffer_add_data(entry, pc);
- if (!fail)
- return;
+ return;
fail:
+ entry->event = NULL;
cpu_buf->sample_lost_overflow++;
}
-#endif
+int oprofile_add_data(struct op_entry *entry, unsigned long val)
+{
+ if (!entry->event)
+ return 0;
+ return op_cpu_buffer_add_data(entry, val);
+}
+
+int oprofile_add_data64(struct op_entry *entry, u64 val)
+{
+ if (!entry->event)
+ return 0;
+ if (op_cpu_buffer_get_size(entry) < 2)
+ /*
+ * the function returns 0 to indicate a too small
+ * buffer, even if there is some space left
+ */
+ return 0;
+ if (!op_cpu_buffer_add_data(entry, (u32)val))
+ return 0;
+ return op_cpu_buffer_add_data(entry, (u32)(val >> 32));
+}
+
+int oprofile_write_commit(struct op_entry *entry)
+{
+ if (!entry->event)
+ return -EINVAL;
+ return op_cpu_buffer_write_commit(entry);
+}
void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)
{
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
- log_sample(cpu_buf, pc, is_kernel, event);
+ log_sample(cpu_buf, pc, 0, is_kernel, event);
}
void oprofile_add_trace(unsigned long pc)
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff