perf: Limit callchains to 127 · 0b0d9cf6ec - Gogs

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>

Arun Sharma 13 years ago

parent

302fa4b58a

commit

0b0d9cf6ec

1 changed files with 1 additions and 1 deletions

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							+ 1
							
							- 1
						
include/linux/perf_event.h
							 
								View File
							
				@@ -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,