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

[Andi Kleen]

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@xxxxxxxxxxxxxxx -- Speaking for myself only.
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