linux-kernel - Re: [PATCH v12 06/18] vmscan: rename shrink

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Message-ID: <20131203100421.GR10988@dastard>
Date:	Tue, 3 Dec 2013 21:04:21 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	hannes@...xchg.org, mhocko@...e.cz, dchinner@...hat.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, cgroups@...r.kernel.org, devel@...nvz.org,
	glommer@...nvz.org, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v12 06/18] vmscan: rename shrink_slab() args to make it
 more generic

On Tue, Dec 03, 2013 at 01:44:38PM +0400, Vladimir Davydov wrote:
> On 12/03/2013 01:33 PM, Dave Chinner wrote:
> >> kmemcg reclaim is introduced, we will have to make up phony values for
> >> nr_pages_scanned and lru_pages again when doing kmem-only reclaim for a
> >> memory cgroup, which is possible if the cgroup has its kmem limit less
> >> than the total memory limit.
> > I'm missing something here - why would memcg reclaim require
> > passing phony values? How are you going to keep slab caches in
> > balance with memory pressure generated by the page cache?
> 
> To perform kmem-only reclaim - please see patch 13. When the kmem limit
> is less than the user limit, we can reach only the kmem limit. It is no
> use trying to reclaim page cache then.

Oh dear. What a nasty hack.

Dave.
-- 
Dave Chinner
david@...morbit.com
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