Re: C14 [00/14] Sl[auo]b: Common code for cgroups V13

[Pekka Enberg <penberg@kernel.org>]

On Wed, Sep 5, 2012 at 2:06 AM, Christoph Lameter <cl@linux.com> wrote:
> This is a series of patches that extracts common functionality from
> slab allocators into a common code base. The intend is to standardize
> as much as possible of the allocator behavior while keeping the
> distinctive features of each allocator which are mostly due to their
> storage format and serialization approaches.
>
> This patchset makes a beginning by extracting common functionality in
> kmem_cache_create() and kmem_cache_destroy(). However, there are
> numerous other areas where such work could be beneficial:
>
> 1. Extract the sysfs support from SLUB and make it common. That way
>    all allocators have a common sysfs API and are handleable in the same
>    way regardless of the allocator chose.
>
> 2. Extract the error reporting and checking from SLUB and make
>    it available for all allocators. This means that all allocators
>    will gain the resiliency and error handling capabilties.
>
> 3. Extract the memory hotplug and cpu hotplug handling. It seems that
>    SLAB may be more sophisticated here. Having common code here will
>    make it easier to maintain the special code.
>
> 4. Extract the aliasing capability of SLUB. This will enable fast
>    slab creation without creating too many additional slab caches.
>    The arrays of caches of varying sizes in numerous subsystems
>    do not cause the creation of numerous slab caches. Storage
>    density is increased and the cache footprint is reduced.
>
> Ultimately it is to be hoped that the special code for each allocator
> shrinks to a mininum. This will also make it easier to make modification
> to allocators.
>
> In the far future one could envision that the current allocators will
> just become storage algorithms that can be chosen based on the need of
> the subsystem. F.e.
>
> Cpu cache dependend performance         = Bonwick allocator (SLAB)
> Minimal cycle count and cache footprint = SLUB
> Maximum storage density                 = K&R allocator (SLOB)

I've created a 'slab/common-for-groups' branch for this and queued it
for linux-next. I had to revert the sysfs patch because it caused
warnings during boot:

https://github.com/penberg/linux/commit/aac3a1664aba429f47c70edfc76ee10fcd808471

I'd like to keep it append-only from now on please send incremental
patches on top of the branch.

Thanks!

                        Pekka

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