linux-kernel - Re: [PATCH v13 13/16] vmscan: take at least one pass with shrinkers

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Message-ID: <52A6FFF0.6080207@parallels.com>
Date:	Tue, 10 Dec 2013 15:50:08 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Dave Chinner <david@...morbit.com>
CC:	<dchinner@...hat.com>, <hannes@...xchg.org>, <mhocko@...e.cz>,
	<akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <cgroups@...r.kernel.org>,
	<devel@...nvz.org>, <glommer@...nvz.org>, <glommer@...il.com>,
	Glauber Costa <gloomer@...nvz.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v13 13/16] vmscan: take at least one pass with shrinkers

On 12/10/2013 08:18 AM, Dave Chinner wrote:
> On Mon, Dec 09, 2013 at 12:05:54PM +0400, Vladimir Davydov wrote:
>> From: Glauber Costa <glommer@...nvz.org>
>>
>> In very low free kernel memory situations, it may be the case that we
>> have less objects to free than our initial batch size. If this is the
>> case, it is better to shrink those, and open space for the new workload
>> then to keep them and fail the new allocations.
>>
>> In particular, we are concerned with the direct reclaim case for memcg.
>> Although this same technique can be applied to other situations just as
>> well, we will start conservative and apply it for that case, which is
>> the one that matters the most.
> This should be at the start of the series.

Since Glauber wanted to introduce this only for memcg-reclaim first,
this can't be at the start of the series, but I'll move it to go
immediately after per-memcg shrinking core in the next iteration.

Thanks.
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