perf sched: Determine the number of CPUs automatically

For 'perf sched map' output, determine max_cpu automatically, instead of the static default of 15. [ v2: use sysconf() pointed out by Arjan van de Ven <[email protected]> ] Cc: Peter Zijlstra <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Frederic Weisbecker <[email protected]> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <[email protected]>
goeke · Sep 17, 2009 · 40749d0 · 40749d0
1 parent 8b41266
commit 40749d0
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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 +1818,8 @@ static struct trace_sched_handler map_ops  = {
 
 static void __cmd_map(void)
 {
+	max_cpu = sysconf(_SC_NPROCESSORS_CONF);
+
 	setup_pager();
 	read_events();
 	print_bad_events();