linux-kernel - Re: [patch 2/3] mm: memcontrol: simplify detecting when the memory+swap limit is hit

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Message-ID: <20140924151421.GA29445@esperanza>
Date:	Wed, 24 Sep 2014 19:14:21 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>, Dave Hansen <dave@...1.net>,
	Michal Hocko <mhocko@...e.cz>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2/3] mm: memcontrol: simplify detecting when the
 memory+swap limit is hit

On Wed, Sep 24, 2014 at 11:08:57AM -0400, Johannes Weiner wrote:
> When attempting to charge pages, we first charge the memory counter
> and then the memory+swap counter.  If one of the counters is at its
> limit, we enter reclaim, but if it's the memory+swap counter, reclaim
> shouldn't swap because that wouldn't change the situation.  However,
> if the counters have the same limits, we never get to the memory+swap
> limit.  To know whether reclaim should swap or not, there is a state
> flag that indicates whether the limits are equal and whether hitting
> the memory limit implies hitting the memory+swap limit.
> 
> Just try the memory+swap counter first.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Vladimir Davydov <vdavydov@...allels.com>
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