https://github.com/torvalds/linux
Revision 7fce250915efca0f8f51dddee3ae89bf30d86ca5 authored by Peter Zijlstra on 24 February 2016, 17:45:48 UTC, committed by Ingo Molnar on 25 February 2016, 07:43:34 UTC
The recent commit 3e349507d12d ("perf: Fix perf_enable_on_exec() event
scheduling") caused this by moving task_ctx_sched_out() from before
__perf_event_mask_enable() to after it.
The overlooked consequence of that change is that task_ctx_sched_out()
would update the ctx time fields, and now __perf_event_mask_enable()
uses stale time.
In order to fix this, explicitly stop our context's time before
enabling the event(s).
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dvyukov@google.com
Cc: eranian@google.com
Cc: panand@redhat.com
Cc: sasha.levin@oracle.com
Cc: vince@deater.net
Fixes: 3e349507d12d ("perf: Fix perf_enable_on_exec() event scheduling")
Link: http://lkml.kernel.org/r/20160224174948.159242158@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 3cbaa59
Tip revision: 7fce250915efca0f8f51dddee3ae89bf30d86ca5 authored by Peter Zijlstra on 24 February 2016, 17:45:48 UTC
perf: Fix scaling vs. perf_event_enable_on_exec()
perf: Fix scaling vs. perf_event_enable_on_exec()
Tip revision: 7fce250
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