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SubjectRe: [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.



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