On Thu, 29 Jan 2015, Vladimir Davydov wrote:
> Come to think of it, do we really need to optimize slab placement in
> kmem_cache_shrink? None of its users except shrink_store expects it -
> they just want to purge the cache before destruction, that's it. May be,
> we'd better move slab placement optimization to a separate SLUB's
> private function that would be called only by shrink_store, where we can
> put up with kmalloc failures? Christoph, what do you think?
The slabinfo tool invokes kmem_cache_shrink to optimize placement.
Run
slabinfo -s
which can then be used to reduce the fragmentation.
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