Peter Zijlstra 144060fee0 perf: Add PM notifiers to fix CPU hotplug races ... Francis reports that s2r gets him spurious NMIs, this is because the suspend code leaves the boot cpu up and running. Cure this by adding a suspend notifier. The problem is that hotplug and suspend are completely un-serialized and the PM notifiers run before the suspend cpu unplug of all but the boot cpu. This leaves a window where the user can initialize another hotplug operation (either remove or add a cpu) resulting in either one too many or one too few hotplug ops. Thus we cannot use the hotplug code for the suspend case. There's another reason to not use the hotplug code, which is that the hotplug code totally destroys the perf state, we can do better for suspend and simply remove all counters from the PMU so that we can re-instate them on resume. Reported-by: Francis Moreau <francis.moro@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-1cvevybkgmv4s6v5y37t4847@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>		2011-08-14 11:53:03 +02:00
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core.c	perf: Add PM notifiers to fix CPU hotplug races	2011-08-14 11:53:03 +02:00
hw_breakpoint.c	perf: Add context field to perf_event	2011-07-01 11:06:38 +02:00
internal.h	perf: Remove the nmi parameter from the swevent and overflow interface	2011-07-01 11:06:35 +02:00
Makefile	perf: Split up buffer handling from core code	2011-06-09 12:57:54 +02:00
ring_buffer.c	perf: Remove the perf_output_begin(.sample) argument	2011-07-01 11:06:35 +02:00