From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladimir Davydov Subject: Re: [patch 2/3] mm: memcontrol: simplify detecting when the memory+swap limit is hit Date: Wed, 24 Sep 2014 19:14:21 +0400 Message-ID: <20140924151421.GA29445@esperanza> References: <1411571338-8178-1-git-send-email-hannes@cmpxchg.org> <1411571338-8178-3-git-send-email-hannes@cmpxchg.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: Content-Disposition: inline In-Reply-To: <1411571338-8178-3-git-send-email-hannes@cmpxchg.org> Sender: owner-linux-mm@kvack.org List-ID: Content-Transfer-Encoding: 7bit To: Johannes Weiner Cc: Andrew Morton , Greg Thelen , Dave Hansen , Michal Hocko , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org 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 Reviewed-by: Vladimir Davydov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org