linux-kernel - Re: [PATCHSET x86/core/percpu] implement dynamic percpu allocator

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Date:	Thu, 19 Feb 2009 12:07:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	rusty@...tcorp.com.au, tglx@...utronix.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, jeremy@...p.org,
	cpw@....com
Subject: Re: [PATCHSET x86/core/percpu] implement dynamic percpu allocator


* Tejun Heo <tj@...nel.org> wrote:

> Tejun Heo wrote:
> >   One trick we can do is to reserve the initial chunk in non-vmalloc
> >   area so that at least the static cpu ones and whatever gets
> >   allocated in the first chunk is served by regular large page
> >   mappings.  Given that those are most frequent visited ones, this
> >   could be a nice compromise - no noticeable penalty for usual cases
> >   yet allowing scalability for unusual cases.  If this is something
> >   which can be agreed on, I'll pursue this.
> 
> I've given more thought to this and it actually will solve 
> most of issues for non-NUMA but it can't be done for NUMA.  
> Any better ideas?

It could be allocated via NUMA-aware bootmem allocations.

	Ingo
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