linux-kernel - [tip:perfcounters/core] perf record: Increase mmap buffering default

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Date:	Tue, 2 Jun 2009 22:32:15 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, jkacur@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, mtosatti@...hat.com,
	tglx@...utronix.de, cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf record: Increase mmap buffering default

Commit-ID:  3cf165fc2e7f221a7a95098b47eb990779e29f5f
Gitweb:     http://git.kernel.org/tip/3cf165fc2e7f221a7a95098b47eb990779e29f5f
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Tue, 2 Jun 2009 23:02:59 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 2 Jun 2009 23:04:24 +0200

perf record: Increase mmap buffering default

I've run into mmap overruns with the current 16 pages default,
increase it to 128 pages.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: John Kacur <jkacur@...hat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 Documentation/perf_counter/builtin-record.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index 19cba6b..8feb119 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -19,9 +19,9 @@ static int			default_interval = 100000;
 static int			event_count[MAX_COUNTERS];
 
 static int			fd[MAX_NR_CPUS][MAX_COUNTERS];
-static int			nr_cpus				=  0;
+static int			nr_cpus				= 0;
 static unsigned int		page_size;
-static unsigned int		mmap_pages			= 16;
+static unsigned int		mmap_pages			= 128;
 static int			output;
 static const char		*output_name			= "perf.data";
 static int			group				= 0;
--
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