linux-kernel - Re: [PATCH 9/12] memcg allocate all page

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Message-Id: <20080927122530.29e02ba8.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Sat, 27 Sep 2008 12:25:30 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Hansen <haveblue@...ibm.com>, ryov@...inux.co.jp
Subject: Re: [PATCH 9/12] memcg allocate all page_cgroup at boot

On Fri, 26 Sep 2008 10:43:36 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> > > -	VM_BUG_ON(pc->page != page);
> > > +	pc = lookup_page_cgroup(page);
> > > +	if (unlikely(!pc || !PageCgroupUsed(pc)))
> > > +		return;
> > > +	preempt_disable();
> > > +	lock_page_cgroup(pc);
> > > +	if (unlikely(page_mapped(page))) {
> > > +		unlock_page_cgroup(pc);
> > > +		preempt_enable();
> > > +		return;
> > > +	}
> > Just for clarification, in what sequence will the page be mapped here?
> > mem_cgroup_uncharge_page checks whether the page is mapped.
> > 

I think I saw page_mapped() case (in your shmem/page test.)
I'll check what cause this if I have time.

Thanks,
-Kame

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