linux-kernel - Re: getting processor numbers

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Message-ID: <4612B12A.30609@redhat.com>
Date:	Tue, 03 Apr 2007 12:55:22 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: getting processor numbers

Siddha, Suresh B wrote:a
> Not all of the cpu* directories in /sys/devices/system/cpu may be
> online.

Apparently this information isn't needed.  It's very easy to verify:

$ ls /sys/devices/system/cpu/*/online
/sys/devices/system/cpu/cpu1/online  /sys/devices/system/cpu/cpu2/online
 /sys/devices/system/cpu/cpu3/online

This is a quad core machine and cpu0 doesn't have the 'online' file
(2.6.19 kernel).  So, if nobody noticed this it's not needed and we can
just remove CPUs from /sys/devices/system/cpu when they are brought
offline, right?

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖


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