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

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Message-Id: <20101007085858.0e07de59.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 7 Oct 2010 08:58:58 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	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

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
> 
> Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>

Doesn't make sense until you show the usage of existing bits.
And I guess 16bit may be too large on 32bit systems.

Nack for now.

Thanks,
-Kame

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