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authorArun Sharma <asharma@fb.com>2012-04-21 02:41:34 +0400
committerIngo Molnar <mingo@kernel.org>2012-06-06 19:08:00 +0400
commit0b0d9cf6ec7bab91977da2d71c09157f110f7c2e (patch)
treec70689cc98aab1500585886bf71a993b21cc6046 /include/linux/perf_event.h
parent302fa4b58ac754a6da13f4f5546f710fecc3b945 (diff)
downloadlinux-0b0d9cf6ec7bab91977da2d71c09157f110f7c2e.tar.xz
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/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h2
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 {
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,