linux-kernel - Re: [patch v3 -mm 1/3] memcg: integrate soft reclaim tighter with zone shrinking code

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Message-ID: <20130516221200.GF7171@mtj.dyndns.org>
Date:	Thu, 16 May 2013 15:12:00 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Ying Han <yinghan@...gle.com>, Hugh Dickins <hughd@...gle.com>,
	Glauber Costa <glommer@...allels.com>,
	Michel Lespinasse <walken@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	Balbir Singh <bsingharora@...il.com>
Subject: Re: [patch v3 -mm 1/3] memcg: integrate soft reclaim tighter with
 zone shrinking code

Sorry about the delay.  Just getting back to memcg.

On Mon, May 13, 2013 at 09:46:10AM +0200, Michal Hocko wrote:
...
> during the first pass. Only groups which are over their soft limit or
> any of their parents up the hierarchy is over the limit are considered

ancestors?

> +static void shrink_zone(struct zone *zone, struct scan_control *sc)
> +{
> +	bool do_soft_reclaim = mem_cgroup_should_soft_reclaim(sc);
> +	unsigned long nr_scanned = sc->nr_scanned;
> +
> +	__shrink_zone(zone, sc, do_soft_reclaim);
> +
> +	/*
> +	 * No group is over the soft limit or those that are do not have
> +	 * pages in the zone we are reclaiming so we have to reclaim everybody
> +	 */
> +	if (do_soft_reclaim && (sc->nr_scanned == nr_scanned)) {
> +		__shrink_zone(zone, sc, false);
> +		return;
> +	}
> +}

Maybe the following is easier to follow?

	if (mem_cgroup_should_soft_reclaim(sc)) {
		__shrink_zone(zone, sc, true);
		if (sc->nr_scanned == nr_scanned)
			__shrink_zone(zone, sc, false);
	} else {
		__shrink_zone(zone, sc, false);
	}

But it's a minor point, please feel free to ignore.

  Reviewed-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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