linux-kernel - Re: [BUGFIX][PATCH v3] memcg: fix behavior of per cpu charge cache draining.

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Message-ID: <20110610133133.GB3818@tiehlicka.suse.cz>
Date:	Fri, 10 Jun 2011 15:31:33 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"bsingharora@...il.com" <bsingharora@...il.com>,
	Ying Han <yinghan@...gle.com>
Subject: Re: [BUGFIX][PATCH v3] memcg: fix behavior of per cpu charge cache
 draining.

On Fri 10-06-11 21:24:51, Hiroyuki Kamezawa wrote:
> 2011/6/10 Michal Hocko <mhocko@...e.cz>:
> > On Fri 10-06-11 18:59:52, KAMEZAWA Hiroyuki wrote:
[...]
> >> @@ -1670,8 +1670,7 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
> >>               victim = mem_cgroup_select_victim(root_mem);
> >>               if (victim == root_mem) {
> >>                       loop++;
> >> -                     if (loop >= 1)
> >> -                             drain_all_stock_async();
> >> +                     drain_all_stock_async(root_mem);
> >>                       if (loop >= 2) {
> >>                               /*
> >>                                * If we have not been able to reclaim
> >
> > This still doesn't prevent from direct reclaim even though we have freed
> > enough pages from pcp caches. Should I post it as a separate patch?
> >
> 
> yes. please in different thread. Maybe moving this out of loop will
> make sense. (And I have a cleanup patch for this loop. I'll do that
> when I post it later, anyway)

OK, I will wait for your cleanup then.
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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