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perf_counter: avoid recursion

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Tracepoint events like lock_acquire and software counters like
pagefaults can recurse into the perf counter code again, avoid that.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090323172417.152096433@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-03-23 18:22:07 +01:00
committed by Ingo Molnar
parent f4a2deb486
commit 96f6d44443
2 changed files with 33 additions and 0 deletions
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7
include/linux/perf_counter.h
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@@ -328,6 +328,13 @@ struct perf_cpu_context {
int active_oncpu;
int max_pertask;
int exclusive;
/*
* Recursion avoidance:
*
* task, softirq, irq, nmi context
*/
int recursion[4];
};
/*