linux-kernel - Re: [RFC] Restrict size of page

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Message-ID: <20101007031459.GL4195@balbir.in.ibm.com>
Date:	Thu, 7 Oct 2010 08:44:59 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Restrict size of page_cgroup->flags

* nishimura@....nes.nec.co.jp <nishimura@....nes.nec.co.jp> [2010-10-07 09:54:58]:

> On Wed, 6 Oct 2010 19:53:14 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> 
> > I propose restricting page_cgroup.flags to 16 bits. The patch for the
> > same is below. Comments?
> > 
> > 
> > Restrict the bits usage in page_cgroup.flags
> > 
> > From: Balbir Singh <balbir@...ux.vnet.ibm.com>
> > 
> > Restricting the flags helps control growth of the flags unbound.
> > Restriciting it to 16 bits gives us the possibility of merging
> > cgroup id with flags (atomicity permitting) and saving a whole
> > long word in page_cgroup
> > 
> I agree that reducing the size of page_cgroup would be good and important.
> But, wouldn't it be better to remove ->page, if possible ?
>

Without the page pointer, how do we go from pc to page for reclaim? 

-- 
	Three Cheers,
	Balbir
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