Commit 0b0d9cf6 authored by Arun Sharma's avatar Arun Sharma Committed by Ingo Molnar

perf: Limit callchains to 127

Stack depth of 255 seems excessive, given that copy_from_user_nmi()
could be slow.
Signed-off-by: default avatarArun Sharma <asharma@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1334961696-19580-3-git-send-email-asharma@fb.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 302fa4b5
...@@ -555,7 +555,7 @@ enum perf_event_type { ...@@ -555,7 +555,7 @@ enum perf_event_type {
PERF_RECORD_MAX, /* non-ABI */ PERF_RECORD_MAX, /* non-ABI */
}; };
#define PERF_MAX_STACK_DEPTH 255 #define PERF_MAX_STACK_DEPTH 127
enum perf_callchain_context { enum perf_callchain_context {
PERF_CONTEXT_HV = (__u64)-32, PERF_CONTEXT_HV = (__u64)-32,
......
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