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

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Date:	Wed, 28 Jan 2015 20:29:22 +0200
From:	Pekka Enberg <penberg@....fi>
To:	Christoph Lameter <cl@...ux.com>,
	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 1/28/15 6:31 PM, Christoph Lameter wrote:
> 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>
Acked-by: Pekka Enberg <penberg@...nel.org>
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