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

tip-bot for Ingo Molnar
2009-06-02T22:32:59Z

Commit-ID: 3cf165fc2e7f221a7a95098b47eb990779e29f5f
Gitweb: http://git.kernel.org/tip/3cf165fc2e7f221a7a95098b47eb990779e29f5f
Author: Ingo Molnar <mingo@elte.hu>
AuthorDate: Tue, 2 Jun 2009 23:02:59 +0200
Committer: Ingo Molnar <mingo@elte.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@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.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;