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

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Date:	Thu, 25 Jun 2009 13:15:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.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

Andi Kleen wrote:
> 
> That's hard to believe or a serious bug/misconfiguration somewhere. 
> 
> Each per CPU data should be <100k (let's say 200k with some slack for modules), 
> so to fill vmalloc you would need hundreds of CPUs, which a 32bit
> kernel doesn't really support anyways because it doesn't support
> enough memory for that many CPUs.
> 
> Perhaps you had firmware/hypervisor who passed a gigantic impossible
> value here? If yes thy
> 

I don't know why, but in the configuration I saw each percpu area was
something like 1.8 MB.

	-hpa

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