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

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Message-ID: <alpine.DEB.2.11.1501281031190.32147@gentwo.org>
Date:	Wed, 28 Jan 2015 10:31:43 -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 Wed, 28 Jan 2015, Vladimir Davydov wrote:

> This patch therefore makes __kmem_cache_shrink() allocate the array on
> stack instead of calling kmalloc, which may fail. The array size is
> chosen to be equal to 32, because most SLUB caches store not more than
> 32 objects per slab page. Slab pages with <= 32 free objects are sorted
> using the array by the number of objects in use and promoted to the head
> of the partial list, while slab pages with > 32 free objects are left in
> the end of the list without any ordering imposed on them.

Acked-by: Christoph Lameter <cl@...ux.com>
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