linux-kernel - Re: [PATCH] Use uname not sysctl to get the kernel revision

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Message-ID: <44B7EC64.5070907@zytor.com>
Date:	Fri, 14 Jul 2006 12:11:32 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Jakub Jelinek <jakub@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	"Randy.Dunlap" <rdunlap@...otime.net>, akpm@...l.org,
	linux-kernel@...r.kernel.org, libc-alpha@...rceware.org
Subject: Re: [PATCH] Use uname not sysctl to get the kernel revision

Benjamin Herrenschmidt wrote:
>>
>> If you want to do the job right then do this
>>
>> - Stick an indicator of how much else wants to run on this CPU in the
>> vsyscall page or similar location
> 
> Except that "this cpu" doesn't really mean anything in userspace, and
> while I think Andi has some tricks to get some sort of CPU number to
> userspace (though it's really only valid during the execution of the
> instruction that reads it :) I haven't yet found an equivalent for
> powerpc (and possibly other architectures will have the same problem).
> 

Sure it does... although its validity in terms of a locality metric 
decays with time.

	-hpa
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