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Date: Fri, 14 Jul 2006 12:11:32 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Arjan van de Ven <arjan@infradead.org>,
       Jakub Jelinek <jakub@redhat.com>, Ulrich Drepper <drepper@redhat.com>,
       Roland McGrath <roland@redhat.com>,
       "Randy.Dunlap" <rdunlap@xenotime.net>, akpm@osdl.org,
       linux-kernel@vger.kernel.org, libc-alpha@sourceware.org
Subject: Re: [PATCH] Use uname not sysctl to get the kernel revision
References: <20060712184412.2BD57180061@magilla.sf.frob.com>	 <44B54EA4.5060506@redhat.com> <20060712195349.GW3823@sunsite.mff.cuni.cz>	 <44B556E5.5000702@zytor.com> <m1k66i8ql5.fsf@ebiederm.dsl.xmission.com>	 <1152739766.3217.83.camel@laptopd505.fenrus.org>	 <m1bqru8p36.fsf@ebiederm.dsl.xmission.com>	 <1152741665.3217.85.camel@laptopd505.fenrus.org>	 <44B57191.5000802@zytor.com>  <m1zmfe794e.fsf@ebiederm.dsl.xmission.com>	 <1152745664.22943.115.camel@localhost.localdomain> <1152902745.23037.88.camel@localhost.localdomain>
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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