linux-kernel - Re: getting processor numbers

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Message-ID: <4612B9D1.4060404@cosmosbay.com>
Date:	Tue, 03 Apr 2007 22:32:17 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ulrich Drepper <drepper@...hat.com>
CC:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: getting processor numbers

Ulrich Drepper a écrit :
> Siddha, Suresh B wrote:
>> No. Logical cpu hotplug uses these interfaces to make a cpu go offline
>> and online.
> 
> You missed my sarcasms, email is bad for conveying it.  The point is
> nobody really cares about that hotplug nonsense to have noticed the bug.
>  And still does this nonsense prevent real problems from being addressed.
> 

Please dont focus on /sys being your holy gral.

1) AFAIK /sys/devices/system/cpu was not designed to meet glibc needs.

2) Many production machines dont mount /sys at all

$ uname -r
2.6.20
$ ls -al /sys/devices/system/cpu
ls: /sys/devices/system/cpu: No such file or directory
$ grep processor /proc/cpuinfo
processor       : 0
processor       : 1

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