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Message-ID: <54C92A82.10805@iki.fi>
Date: Wed, 28 Jan 2015 20:29:22 +0200
From: Pekka Enberg <penberg@iki.fi>
MIME-Version: 1.0
Subject: Re: [PATCH -mm v2 1/3] slub: never fail to shrink cache
References: <cover.1422461573.git.vdavydov@parallels.com> <012683fc3a0f9fb20a288986fd63fe9f6d25e8ee.1422461573.git.vdavydov@parallels.com> <alpine.DEB.2.11.1501281031190.32147@gentwo.org>
In-Reply-To: <alpine.DEB.2.11.1501281031190.32147@gentwo.org>
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To: Christoph Lameter <cl@linux.com>, Vladimir Davydov <vdavydov@parallels.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Pekka Enberg <penberg@kernel.org>, David Rientjes <rientjes@google.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, linux-mm@kvack.org, linux-kernel@vger.kernel.org

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@linux.com>
Acked-by: Pekka Enberg <penberg@kernel.org>

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