linux-kernel - Re: [PATCH -mm v2 1/3] slub: never fail to shrink cache

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Message-ID: <alpine.DEB.2.11.1501290954230.7725@gentwo.org>
Date:	Thu, 29 Jan 2015 09:55:56 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm v2 1/3] slub: never fail to shrink cache

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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