linux-kernel - Re: [PATCH -mm v2 8/8] slab: make dead memcg caches discard free slabs immediately

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Message-ID: <alpine.DEB.2.10.1406131133380.913@gentwo.org>
Date:	Fri, 13 Jun 2014 11:34:39 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Vladimir Davydov <vdavydov@...allels.com>,
	akpm@...ux-foundation.org, rientjes@...gle.com, penberg@...nel.org,
	hannes@...xchg.org, mhocko@...e.cz, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH -mm v2 8/8] slab: make dead memcg caches discard free
 slabs immediately

On Thu, 12 Jun 2014, Joonsoo Kim wrote:

> BTW, I have a question about cache_reap(). If there are many kmemcg
> users, we would have a lot of slab caches and just to traverse slab
> cache list could take some times. Is it no problem?

Its a big problem and one of the reasons that SLUB was developed. Cache
reaping caused noticable random delays to processing which was
significantly impacting HPC loads of SGI.


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