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perf: Remove the perf_output_begin(.sample) argument

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Since only samples call perf_output_sample() its much saner (and more
correct) to put the sample logic in there than in the
perf_output_begin()/perf_output_end() pair.

Saves a useless argument, reduces conditionals and shrinks
struct perf_output_handle, win!

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-2crpvsx3cqu67q3zqjbnlpsc@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2011-06-27 16:47:16 +02:00
committed by Ingo Molnar
parent a8b0ca17b8
commit a7ac67ea02
4 changed files with 23 additions and 28 deletions
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26
kernel/events/core.c
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@@ -3928,6 +3928,20 @@ void perf_output_sample(struct perf_output_handle *handle,
perf_output_put(handle, raw);
}
}
if (!event->attr.watermark) {
int wakeup_events = event->attr.wakeup_events;
if (wakeup_events) {
struct ring_buffer *rb = handle->rb;
int events = local_inc_return(&rb->events);
if (events >= wakeup_events) {
local_sub(wakeup_events, &rb->events);
local_inc(&rb->wakeup);
}
}
}
}
void perf_prepare_sample(struct perf_event_header *header,
@@ -3984,7 +3998,7 @@ static void perf_event_output(struct perf_event *event,
perf_prepare_sample(&header, data, event, regs);
if (perf_output_begin(&handle, event, header.size, 1))
if (perf_output_begin(&handle, event, header.size))
goto exit;
perf_output_sample(&handle, &header, data, event);
@@ -4024,7 +4038,7 @@ perf_event_read_event(struct perf_event *event,
int ret;
perf_event_header__init_id(&read_event.header, &sample, event);
ret = perf_output_begin(&handle, event, read_event.header.size, 0);
ret = perf_output_begin(&handle, event, read_event.header.size);
if (ret)
return;
@@ -4067,7 +4081,7 @@ static void perf_event_task_output(struct perf_event *event,
perf_event_header__init_id(&task_event->event_id.header, &sample, event);
ret = perf_output_begin(&handle, event,
task_event->event_id.header.size, 0);
task_event->event_id.header.size);
if (ret)
goto out;
@@ -4204,7 +4218,7 @@ static void perf_event_comm_output(struct perf_event *event,
perf_event_header__init_id(&comm_event->event_id.header, &sample, event);
ret = perf_output_begin(&handle, event,
comm_event->event_id.header.size, 0);
comm_event->event_id.header.size);
if (ret)
goto out;
@@ -4351,7 +4365,7 @@ static void perf_event_mmap_output(struct perf_event *event,
perf_event_header__init_id(&mmap_event->event_id.header, &sample, event);
ret = perf_output_begin(&handle, event,
mmap_event->event_id.header.size, 0);
mmap_event->event_id.header.size);
if (ret)
goto out;
@@ -4546,7 +4560,7 @@ static void perf_log_throttle(struct perf_event *event, int enable)
perf_event_header__init_id(&throttle_event.header, &sample, event);
ret = perf_output_begin(&handle, event,
throttle_event.header.size, 0);
throttle_event.header.size);
if (ret)
return;