linux-kernel - Re: [PATCH 1/3] x86: modify show_shared_cpu_map in intel

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Date:	Thu, 10 Apr 2008 19:24:37 +0200
From:	"Bert Wesarg" <bert.wesarg@...glemail.com>
To:	"Mike Travis" <travis@....com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Paul Jackson" <pj@....com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86: modify show_shared_cpu_map in intel_cacheinfo v3

On Tue, Apr 8, 2008 at 10:44 PM, Mike Travis <travis@....com> wrote:
>  Btw, you were asking about how to determine NR_CPUS.  Here's one way:
>
>  root@...ton:~# cat /sys/devices/system/cpu/online
>  0-2,4-7
>  root@...ton:~# cat /sys/devices/system/cpu/possible
>  0-511
>  root@...ton:~# cat /sys/devices/system/cpu/present
>  0-7
>  root@...ton:~# cat /sys/devices/system/cpu/system
>  0-4095
I think its easier to count the commas from a cpumask file. Here you
must parse a complete list expression, just to get the max id.

Either way, I think this isn't a very clean way.

Bert
>  Thanks,
>  Mike
>
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