linux-kernel - Re: getting processor numbers

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Message-ID: <20070403175605.GB1166@gallifrey>
Date:	Tue, 3 Apr 2007 18:56:05 +0100
From:	"Dr. David Alan Gilbert" <linux@...blig.org>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: getting processor numbers

* Ulrich Drepper (drepper@...hat.com) wrote:

> glibc for a long time provides functionality to retrieve the number
> through sysconf() and this is what fortunately most programs use.  The
> problem is that we are currently using /proc/cpuinfo since this is all
> there was available at that time.  Creating /proc/cpuinfo takes the
> kernel quite a long time, unfortunately (I think Jakub said it is mainly
> the interrupt information).

It's not only expensive to create, it's expensive and annoying to parse;
I don't think it is vaguely consistent accross different architectures
not to mention kernel versions.

Dave
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    | Running GNU/Linux on Alpha,68K| Happy  \ 
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