Messages in this thread Patch in this message | | | Date | Wed, 6 Jun 2012 09:03:02 -0700 | From | tip-bot for Arun Sharma <> | Subject | [tip:perf/core] perf: Limit callchains to 127 |
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Commit-ID: 0b0d9cf6ec7bab91977da2d71c09157f110f7c2e Gitweb: http://git.kernel.org/tip/0b0d9cf6ec7bab91977da2d71c09157f110f7c2e Author: Arun Sharma <asharma@fb.com> AuthorDate: Fri, 20 Apr 2012 15:41:34 -0700 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 6 Jun 2012 17:08:00 +0200
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> --- 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 1817d40..45db49f 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -555,7 +555,7 @@ enum perf_event_type { PERF_RECORD_MAX, /* non-ABI */ }; -#define PERF_MAX_STACK_DEPTH 255 +#define PERF_MAX_STACK_DEPTH 127 enum perf_callchain_context { PERF_CONTEXT_HV = (__u64)-32,
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