linux-kernel - Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support

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Message-ID: <4A442C48.6060308@zytor.com>
Date:	Thu, 25 Jun 2009 19:02:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	cl@...ux-foundation.org
Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and improve
 lpage NUMA support

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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