linux-kernel - Re: [RFC][PATCH 1/5] memcg : force

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Date:	Tue, 4 Nov 2008 15:17:48 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	hugh@...itas.com, taka@...inux.co.jp
Subject: Re: [RFC][PATCH 1/5] memcg : force_empty to do move account

On Mon, 3 Nov 2008 22:15:41 -0800
Paul Menage <menage@...gle.com> wrote:

> On Thu, Oct 30, 2008 at 6:52 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> > This patch provides a function to move account information of a page between
> > mem_cgroups and rewrite force_empty to make use of this.
> 
> One part of this that wasn't clear to me - if a cgroup has a lot of
> unmapped pagecache sitting around but no tasks, and we try to rmdir
> it, then all the pagecache gets moved to the parent too? Or just the
> stray mapped pages?
> 
All page caches will be moved to. 
(I'll add "shrink_usage" interface to drop page caches, later.)

> > @@ -597,7 +709,7 @@ static int mem_cgroup_charge_common(stru
> >        prefetchw(pc);
> >
> >        mem = memcg;
> > -       ret = mem_cgroup_try_charge(mm, gfp_mask, &mem);
> > +       ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true);
> 
> Isn't this the same as the definition of mem_cgroup_try_charge()? So
> you could leave it as-is?
> 
try_charge is called by other places....swapin.

Thanks,
-Kame

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