linux-kernel - Re: getting processor numbers

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Message-ID: <46129619.8050107@redhat.com>
Date:	Tue, 03 Apr 2007 10:59:53 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: getting processor numbers

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

Brilliant.  You people really know how to create user interfaces.  So
now in any case per CPU another stat/access syscall is needed to check
the 'online' pseudo-file?  With this the readdir solution is only
marginally faster than parsing /proc/cpuinfo which means, it's
unacceptably slow.

I cannot believe all these big system people are allowed to screw
everybody else up with their nonsense.

So, anybody else has a proposal?  This is a pressing issue and cannot
wait until someday in the distant future NUMA topology information is
easily and speedily accessible.

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

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