linux-kernel - Re: [RFC][PATCH 5/5] memcg softlimit hooks to kswapd

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Message-Id: <20090312130200.5c0e19d1.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 12 Mar 2009 13:02:00 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC][PATCH 5/5] memcg softlimit hooks to kswapd

On Thu, 12 Mar 2009 09:28:37 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-03-12 10:00:08]:

> > +	return;
> > +}
> 
> I experimented a *lot* with zone reclaim and found it to be not so
> effective. Here is why
> 
> 1. We have no control over priority or how much to scan, that is
> controlled by balance_pgdat(). If we find that we are unable to scan
> anything, we continue scanning with the scan > 0 check, but we scan
> the same pages and the same number, because shrink_zone does scan >>
> priority.

If sc->nr_reclaimd==0, "false" is passed and mem_cgroup_schedule_end()
and it will be moved to INACTIVE queue. (and not appear here again.)


> 2. If we fail to reclaim pages in shrink_zone_softlimit, shrink_zone()
> will reclaim pages independent of the soft limit for us
> 
yes. It's intentional behavior.

Thanks,
-Kame

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