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perf: Fix exit() vs PERF_FORMAT_GROUP 

Both Stephane and Corey reported that PERF_FORMAT_GROUP didn't
work as expected if the task the counters were attached to quit
before the read() call.

The cause is that we unconditionally destroy the grouping when
we remove counters from their context. Fix this by splitting off
the group destroy from the list removal such that
perf_event_remove_from_context() does not do this and change
perf_event_release() to do so.

Reported-by: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Reported-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: <stable@kernel.org> # .34.x
LKML-Reference: <1273571513.5605.3527.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-05-11 11:51:53 +02:00 committed by Ingo Molnar
parent e3174cfd2a
commit 050735b08c
1 changed files with 16 additions and 3 deletions
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19
kernel/perf_event.c
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@ -308,8 +308,6 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
static void
list_del_event(struct perf_event *event, struct perf_event_context *ctx)
{
struct perf_event *sibling, *tmp;
if (list_empty(&event->group_entry))
return;
ctx->nr_events--;
@ -333,6 +331,12 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
*/
if (event->state > PERF_EVENT_STATE_OFF)
event->state = PERF_EVENT_STATE_OFF;
}
static void
perf_destroy_group(struct perf_event *event, struct perf_event_context *ctx)
{
struct perf_event *sibling, *tmp;
/*
* If this was a group event with sibling events then
@ -1868,6 +1872,12 @@ int perf_event_release_kernel(struct perf_event *event)
{
struct perf_event_context *ctx = event->ctx;
/*
* Remove from the PMU, can't get re-enabled since we got
* here because the last ref went.
*/
perf_event_disable(event);
WARN_ON_ONCE(ctx->parent_ctx);
/*
* There are two ways this annotation is useful:
@ -1882,7 +1892,10 @@ int perf_event_release_kernel(struct perf_event *event)
* to trigger the AB-BA case.
*/
mutex_lock_nested(&ctx->mutex, SINGLE_DEPTH_NESTING);
perf_event_remove_from_context(event);
raw_spin_lock_irq(&ctx->lock);
list_del_event(event, ctx);
perf_destroy_group(event, ctx);
raw_spin_unlock_irq(&ctx->lock);
mutex_unlock(&ctx->mutex);
mutex_lock(&event->owner->perf_event_mutex);