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

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Message-ID: <20090626065423.GY6760@one.firstfloor.org>
Date:	Fri, 26 Jun 2009 08:54:23 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>, "H. Peter Anvin" <hpa@...or.com>,
	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

On Fri, Jun 26, 2009 at 09:40:10AM +0900, 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.

It would be better then to fix lockdep then to add weird hacks for that
elsewhere.

e.g. it could just allocate buffers in a cpu up/down callback and 
only put a pointer to these buffers into percpu.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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