linux-kernel - Re: [PATCH 09/10] percpu: implement new dynamic percpu allocator

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Message-ID: <499E1DCF.7090005@kernel.org>
Date:	Fri, 20 Feb 2009 12:04:47 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	rusty@...tcorp.com.au, tglx@...utronix.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, jeremy@...p.org,
	cpw@....com, mingo@...e.hu
Subject: Re: [PATCH 09/10] percpu: implement new dynamic percpu allocator

Hello, Nick.

Nick Piggin wrote:
> On Wednesday 18 February 2009 23:04:35 Tejun Heo wrote:
>> Impact: new scalable dynamic percpu allocator which allows dynamic
>>         percpu areas to be accessed the same way as static ones
>>
>> Implement scalable dynamic percpu allocator which can be used for both
>> static and dynamic percpu areas.  This will allow static and dynamic
>> areas to share faster direct access methods.  This feature is optional
>> and enabled only when CONFIG_HAVE_DYNAMIC_PER_CPU_AREA is defined by
>> arch.  Please read comment on top of mm/percpu.c for details.
> 
> Seems pretty nice. Wishlist: would be cool to have per-cpu virtual
> memory mappings and do CPU-local percpu access via a single pointer.
> Of course there would need to be some machinery and maybe a new API
> to be more careful about accessing remote percpu data (that access
> could perhaps just be slower and go via the linear mapping).

Yeah, that's what's scheduled next.  Direct percpu accessors and
probably consolidation of local_t into percpu accessors.  Once dust
around the allocator itself settles down, I'll work on those.

Thanks.

-- 
tejun
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