linux-kernel - Re: [patch 2/8] mm: memcg-aware global reclaim

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Date:	Thu, 11 Aug 2011 23:09:14 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Ying Han <yinghan@...gle.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/8] mm: memcg-aware global reclaim

On Thu, Aug 11, 2011 at 01:39:45PM -0700, Ying Han wrote:
> Please consider including the following patch for the next post. It causes
> crash on some of the tests where sc->mem_cgroup is NULL (global kswapd).
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index b72a844..12ab25d 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2768,7 +2768,8 @@ loop_again:
>                          * Do some background aging of the anon list, to
> give
>                          * pages a chance to be referenced before
> reclaiming.
>                          */
> -                       if (inactive_anon_is_low(zone, &sc))
> +                       if (scanning_global_lru(&sc) &&
> +                                       inactive_anon_is_low(zone, &sc))
>                                 shrink_active_list(SWAP_CLUSTER_MAX, zone,
>                                                         &sc, priority, 0);

Thanks!  I completely overlooked this one and only noticed it after
changing the arguments to shrink_active_list().

On memcg configurations, scanning_global_lru() will essentially never
be true again, so I moved the anon pre-aging to a separate function
that also does a hierarchy loop to preage the per-memcg anon lists.

I hope to send out the next revision soon.
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