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

tip-bot for Ingo Molnar
2009-09-17T18:08:04Z

Commit-ID: 5349256ab12dcbc766495cd1cf3651f7203f8564
Gitweb: http://git.kernel.org/tip/5349256ab12dcbc766495cd1cf3651f7203f8564
Author: Ingo Molnar <mingo@elte.hu>
AuthorDate: Thu, 17 Sep 2009 18:24:55 +0200
Committer: Ingo Molnar <mingo@elte.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@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.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();