Re: [tip:perfcounters/core] perf sched: Determine the number of CPUs automatically
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
- Subject: Re: [tip:perfcounters/core] perf sched: Determine the number of CPUs automatically
- From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
- Date: Thu, 17 Sep 2009 21:34:09 +0200
- Cc: mingo@xxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, acme@xxxxxxxxxx, paulus@xxxxxxxxx, hpa@xxxxxxxxx, mingo@xxxxxxxxxx, a.p.zijlstra@xxxxxxxxx, efault@xxxxxx, fweisbec@xxxxxxxxx, tglx@xxxxxxxxxxxxx
- In-reply-to: <tip-5349256ab12dcbc766495cd1cf3651f7203f8564@xxxxxxxxxxxxxx>
- Organization: Intel
- References: <new-submission> <tip-5349256ab12dcbc766495cd1cf3651f7203f8564@xxxxxxxxxxxxxx>
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
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
[Index of Archives]
[Linux Stable Commits]
[Linux Stable Kernel]
[Linux Kernel]
[Linux USB Devel]
[Linux Video &Media]
[Linux Audio Users]
[Yosemite News]
[Linux SCSI]