linux-kernel - [tip:perfcounters/core] perf sched: Determine the number of CPUs automatically

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Date:	Thu, 17 Sep 2009 18:07:09 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, a.p.zijlstra@...llo.nl,
	efault@....de, fweisbec@...il.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perfcounters/core] perf sched: Determine the number of CPUs automatically

Commit-ID:  5349256ab12dcbc766495cd1cf3651f7203f8564
Gitweb:     http://git.kernel.org/tip/5349256ab12dcbc766495cd1cf3651f7203f8564
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Thu, 17 Sep 2009 18:24:55 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 17 Sep 2009 18:24:55 +0200

perf sched: Determine the number of CPUs automatically

For 'perf sched map' output, determine max_cpu automatically,
instead of the static default of 15.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 tools/perf/builtin-sched.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index f67e351..947fd71 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1347,7 +1347,7 @@ process_sched_wakeup_event(struct raw_event_sample *raw,
  * Track the current task - that way we can know whether there's any
  * weird events, such as a task being switched away that is not current.
  */
-static int max_cpu = 15;
+static int max_cpu;
 
 static u32 curr_pid[MAX_CPUS] = { [0 ... MAX_CPUS-1] = -1 };
 
@@ -1818,6 +1818,9 @@ static struct trace_sched_handler map_ops  = {
 
 static void __cmd_map(void)
 {
+	max_cpu = system("exit `grep ^processor /proc/cpuinfo  | wc -l`");
+	max_cpu = WEXITSTATUS(max_cpu)-1;
+
 	setup_pager();
 	read_events();
 	print_bad_events();
--
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