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

Arjan van de Ven
2009-09-17T19:34:29Z

On Thu, 17 Sep 2009 18:07:09 GMT
>
> perf sched: Determine the number of CPUs automatically
>
> For 'perf sched map' output, determine max_cpu automatically,
> instead of the static default of 15.
>
> 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`");

YUCK.

what is wrong with
max_cpu = sysconf(_SC_NPROCESSORS_CONF);
??

--
Arjan van de Ven Intel Open Source Technology Centre
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