linux-kernel - Re: [RFC mm][PATCH 4/5] add a lowmem check function

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Date:	Fri, 11 Dec 2009 09:39:38 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	"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>,
	minchan.kim@...il.com, mingo@...e.hu
Subject: Re: [RFC mm][PATCH 4/5] add a lowmem check function

On Thu, 10 Dec 2009 11:59:11 -0600 (CST)
Christoph Lameter <cl@...ux-foundation.org> wrote:

> On Thu, 10 Dec 2009, KAMEZAWA Hiroyuki wrote:
> 
> > This patch adds an integer lowmem_zone, which is initialized to -1.
> > If zone_idx(zone) <= lowmem_zone, the zone is lowmem.
> 
> There is already a policy_zone in mempolicy.h. lowmem is if the zone
> number is  lower than policy_zone. Can we avoid adding another zone
> limiter?
> 
My previous version (one month ago) does that. In this set, I tried to use
unified approach for all CONFIG_NUMA/HIGHMEM/flat ones.

Hmm, How about adding following kind of patch after this

#define policy_zone (lowmem_zone + 1)

and remove policy_zone ? I think the name of "policy_zone" implies
"this is for mempolicy, NUMA" and don't think good name for generic use.


Thanks,
-Kame

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