perf: Do not set task_ctx pointer in cpuctx if there are no events in the context
authorGleb Natapov <gleb@redhat.com>
Sun, 23 Oct 2011 17:10:33 +0000 (19:10 +0200)
committerIngo Molnar <mingo@elte.hu>
Mon, 14 Nov 2011 12:01:21 +0000 (13:01 +0100)
commit1d5f003f5a964711853514b04ddc872eec0fdc7b
tree6f3e912a02b50dc698f601c3a08453a781e7f754
parent57d1c0c03c6b48b2b96870d831b9ce6b917f53ac
perf: Do not set task_ctx pointer in cpuctx if there are no events in the context

Do not set task_ctx pointer during sched_in if there are no
events associated with the context.  Otherwise if during task
execution total number of events in the system will become zero
perf_event_context_sched_out() will not be called and cpuctx->task_ctx
will be left with a stale value.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20111023171033.GI17571@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/events/core.c