From: Arun Sharma <asharma@fb.com>
To: linux-kernel@vger.kernel.org
Cc: Arun Sharma <asharma@fb.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>
Subject: [PATCH 2/4] perf: Limit callchains to 127
Date: Fri, 20 Apr 2012 15:41:34 -0700 [thread overview]
Message-ID: <1334961696-19580-3-git-send-email-asharma@fb.com> (raw)
In-Reply-To: <1334961696-19580-1-git-send-email-asharma@fb.com>
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: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.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 ddbb6a9..d1e71c1 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -609,7 +609,7 @@ struct perf_guest_info_callbacks {
#include <linux/sysfs.h>
#include <asm/local.h>
-#define PERF_MAX_STACK_DEPTH 255
+#define PERF_MAX_STACK_DEPTH 127
struct perf_callchain_entry {
__u64 nr;
--
1.7.8.4
next prev parent reply other threads:[~2012-04-20 22:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-20 22:41 [PATCH 0/4] perf: Support multiple stacks (v3) Arun Sharma
2012-04-20 22:41 ` [PATCH 1/4] perf, x86: Allow multiple stacks Arun Sharma
2012-05-07 23:46 ` Arun Sharma
2012-06-06 16:02 ` [tip:perf/core] perf/x86: " tip-bot for Arun Sharma
2012-04-20 22:41 ` Arun Sharma [this message]
2012-06-06 16:03 ` [tip:perf/core] perf: Limit callchains to 127 tip-bot for Arun Sharma
2012-04-20 22:41 ` [PATCH 3/4] perf, x86: Check if user fp is valid Arun Sharma
2012-06-06 16:03 ` [tip:perf/core] perf/x86: " tip-bot for Arun Sharma
2012-04-20 22:41 ` [PATCH 4/4] x86: Check user address explicitly in copy_from_user_nmi() Arun Sharma
2012-06-05 16:55 ` Peter Zijlstra
2012-06-06 16:04 ` [tip:perf/core] perf/x86: " tip-bot for Arun Sharma
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