linux-kernel - Re: [PATCH] mm: vmscan: fix memcg-aware shrinkers not called on global reclaim

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Message-ID: <20160801132145.GA19395@esperanza>
Date:	Mon, 1 Aug 2016 16:21:45 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Michal Hocko <mhocko@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Minchan Kim <minchan@...nel.org>,
	"Rik van Riel" <riel@...riel.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: vmscan: fix memcg-aware shrinkers not called on
 global reclaim

On Mon, Aug 01, 2016 at 03:18:40PM +0200, Michal Hocko wrote:
> On Mon 01-08-16 16:03:10, Vladimir Davydov wrote:
> > We must call shrink_slab() for each memory cgroup on both global and
> > memcg reclaim in shrink_node_memcg(). Commit d71df22b55099 accidentally
> > changed that so that now shrink_slab() is only called with memcg != NULL
> > on memcg reclaim. As a result, memcg-aware shrinkers (including
> > dentry/inode) are never invoked on global reclaim. Fix that.
> > 
> > Fixes: d71df22b55099 ("mm, vmscan: begin reclaiming pages on a per-node basis")
> 
> I guess you meant b2e18757f2c9. I do not see d71df22b55099 anywhere.

I'm basing on top of v4.7-mmotm-2016-07-28-16-33 and there it's
d71df22b55099.

> 
> > Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
> 
> The fix looks ok to me otherwise
> 
> Acked-by: Michal Hocko <mhocko@...e.com>

Thanks!