perf, x86: Less disastrous PEBS/BTS buffer allocation failure

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Currently PEBS/BTS buffers are allocated when we instantiate the first
event, when this fails everything fails.

This is a problem because esp. BTS tries to allocate a rather large
buffer (64K), which can easily fail.

This patch changes the logic such that when either buffer allocation
fails, we simply don't allow events that would use these facilities,
but continue functioning for all other events.

This logic comes from a much larger patch proposed by Stephane.

Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Stephane Eranian <eranian@google.com>
LKML-Reference: <20101019134808.354429461@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Peter Zijlstra 2010-10-19 14:22:50 +02:00 • committed by Ingo Molnar

parent 5553be2620

commit 6809b6ea73

2 changed files with 47 additions and 16 deletions

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5

arch/x86/kernel/cpu/perf_event.c

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60

arch/x86/kernel/cpu/perf_event_intel_ds.c

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