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perf events: Dont report side-band events on each cpu for per-task-per-cpu events 

Acme noticed that his FORK/MMAP numbers were inflated by about
the same factor as his cpu-count.

This led to the discovery of a few more sites that need to
respect the event->cpu filter.

Reported-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091217121830.215333434@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-12-17 13:16:32 +01:00 committed by Ingo Molnar
parent 06d65bda75
commit 5d27c23df0
1 changed files with 18 additions and 14 deletions
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32
kernel/perf_event.c
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@ -1381,6 +1381,9 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
if (event->state != PERF_EVENT_STATE_ACTIVE)
continue;
if (event->cpu != -1 && event->cpu != smp_processor_id())
continue;
hwc = &event->hw;
interrupts = hwc->interrupts;
@ -3265,6 +3268,9 @@ static void perf_event_task_output(struct perf_event *event,
static int perf_event_task_match(struct perf_event *event)
{
if (event->cpu != -1 && event->cpu != smp_processor_id())
return 0;
if (event->attr.comm || event->attr.mmap || event->attr.task)
return 1;
@ -3290,12 +3296,11 @@ static void perf_event_task_event(struct perf_task_event *task_event)
rcu_read_lock();
cpuctx = &get_cpu_var(perf_cpu_context);
perf_event_task_ctx(&cpuctx->ctx, task_event);
put_cpu_var(perf_cpu_context);
if (!ctx)
ctx = rcu_dereference(task_event->task->perf_event_ctxp);
if (ctx)
perf_event_task_ctx(ctx, task_event);
put_cpu_var(perf_cpu_context);
rcu_read_unlock();
}
@ -3372,6 +3377,9 @@ static void perf_event_comm_output(struct perf_event *event,
static int perf_event_comm_match(struct perf_event *event)
{
if (event->cpu != -1 && event->cpu != smp_processor_id())
return 0;
if (event->attr.comm)
return 1;
@ -3408,15 +3416,10 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
rcu_read_lock();
cpuctx = &get_cpu_var(perf_cpu_context);
perf_event_comm_ctx(&cpuctx->ctx, comm_event);
put_cpu_var(perf_cpu_context);
/*
* doesn't really matter which of the child contexts the
* events ends up in.
*/
ctx = rcu_dereference(current->perf_event_ctxp);
if (ctx)
perf_event_comm_ctx(ctx, comm_event);
put_cpu_var(perf_cpu_context);
rcu_read_unlock();
}
@ -3491,6 +3494,9 @@ static void perf_event_mmap_output(struct perf_event *event,
static int perf_event_mmap_match(struct perf_event *event,
struct perf_mmap_event *mmap_event)
{
if (event->cpu != -1 && event->cpu != smp_processor_id())
return 0;
if (event->attr.mmap)
return 1;
@ -3564,15 +3570,10 @@ got_name:
rcu_read_lock();
cpuctx = &get_cpu_var(perf_cpu_context);
perf_event_mmap_ctx(&cpuctx->ctx, mmap_event);
put_cpu_var(perf_cpu_context);
/*
* doesn't really matter which of the child contexts the
* events ends up in.
*/
ctx = rcu_dereference(current->perf_event_ctxp);
if (ctx)
perf_event_mmap_ctx(ctx, mmap_event);
put_cpu_var(perf_cpu_context);
rcu_read_unlock();
kfree(buf);
@ -3863,6 +3864,9 @@ static int perf_swevent_match(struct perf_event *event,
struct perf_sample_data *data,
struct pt_regs *regs)
{
if (event->cpu != -1 && event->cpu != smp_processor_id())
return 0;
if (!perf_swevent_is_counting(event))
return 0;