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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-08-07 19:49:01 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-09 12:54:46 +0200 |
| commit | 3a80b4a3539696f4b0574876326860323035a302 (patch) | |
| tree | 9d2901259a2b25b181997f89495452fd7f06827b /tools/perf/Documentation | |
| parent | 3a43ce68ae1758fa6a839386025ef45acb6baa22 (diff) | |
| download | linux-3a80b4a3539696f4b0574876326860323035a302.tar.gz linux-3a80b4a3539696f4b0574876326860323035a302.tar.bz2 linux-3a80b4a3539696f4b0574876326860323035a302.zip | |
perf_counter: Fix a race on perf_counter_ctx
While extending perfcounters with BTS hw-tracing, Markus
Metzger managed to trigger this warning:
[ 995.557128] WARNING: at kernel/perf_counter.c:1191 __perf_counter_task_sched_out+0x48/0x6b()
triggers because commit
9f498cc5be7e013d8d6e4c616980ed0ffc8680d2 (perf_counter: Full
task tracing) removed clearing of tsk->perf_counter_ctxp out
from under ctx->lock which introduced a race (against
perf_lock_task_context).
Move it back and deal with the exit notification by explicitly
passing along the former task context.
Reported-by: Markus T Metzger <markus.t.metzger@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1249667341.17467.5.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/Documentation')
0 files changed, 0 insertions, 0 deletions