Message-ID: <4A442C48.6060308@zytor.com>
Date: Thu, 25 Jun 2009 19:02:48 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Tejun Heo <tj@kernel.org>
CC: Andi Kleen <andi@firstfloor.org>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       x86@kernel.org, linux-arch@vger.kernel.org, mingo@elte.hu,
       tglx@linutronix.de, cl@linux-foundation.org
Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and improve
 lpage NUMA support
References: <1245850216-31653-1-git-send-email-tj@kernel.org> <20090624165508.30b88343.akpm@linux-foundation.org> <20090625000202.GR6760@one.firstfloor.org> <4A42C131.6040007@zytor.com> <20090625091939.GS6760@one.firstfloor.org> <4A43871F.9030507@zytor.com> <20090625195408.GW6760@one.firstfloor.org> <4A43DAFD.90409@zytor.com> <20090625202642.GX6760@one.firstfloor.org> <4A4418EA.9000705@kernel.org>
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Tejun Heo wrote:
> Andi Kleen wrote:
>>> I don't know why, but in the configuration I saw each percpu area was
>>> something like 1.8 MB.
>> That sounds like something that needs to be investigated and fixed then.
>> In a sense per cpu space is precious like stack space and shouldn't 
>> be wasted.
> 
> The large percpu space is most likely from lockdep.
> 

That makes sense.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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