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perf_counter: fix counter inheritance race

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Context rotation should not occur when we are in the middle of
walking the counter list when inheriting counters ...

[ Impact: fix occasionally incorrect perf stat results ]

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2009-05-17 11:24:08 +02:00
parent 33b2fb303f
commit c44d70a340
2 changed files with 10 additions and 1 deletions
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include/linux/perf_counter.h
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@@ -508,6 +508,7 @@ struct perf_counter_context {
int nr_counters;
int nr_active;
int is_active;
int rr_allowed;
struct task_struct *task;
/*