diff options
| author | Arun Sharma <asharma@fb.com> | 2012-04-20 18:41:34 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-06-06 11:08:00 -0400 |
| commit | 0b0d9cf6ec7bab91977da2d71c09157f110f7c2e (patch) | |
| tree | c70689cc98aab1500585886bf71a993b21cc6046 /include | |
| parent | 302fa4b58ac754a6da13f4f5546f710fecc3b945 (diff) | |
perf: Limit callchains to 127
Stack depth of 255 seems excessive, given that copy_from_user_nmi()
could be slow.
Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1334961696-19580-3-git-send-email-asharma@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/perf_event.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 1817d4015e5f..45db49f64bb4 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h | |||
| @@ -555,7 +555,7 @@ enum perf_event_type { | |||
| 555 | PERF_RECORD_MAX, /* non-ABI */ | 555 | PERF_RECORD_MAX, /* non-ABI */ |
| 556 | }; | 556 | }; |
| 557 | 557 | ||
| 558 | #define PERF_MAX_STACK_DEPTH 255 | 558 | #define PERF_MAX_STACK_DEPTH 127 |
| 559 | 559 | ||
| 560 | enum perf_callchain_context { | 560 | enum perf_callchain_context { |
| 561 | PERF_CONTEXT_HV = (__u64)-32, | 561 | PERF_CONTEXT_HV = (__u64)-32, |