linux-kernel - Re: [PATCH 2/3] Refactor zone

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Message-Id: <20101201175911.b761ce81.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 1 Dec 2010 17:59:11 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	linux-mm@...ck.org, Christoph Lameter <cl@...ux.com>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/3] Refactor zone_reclaim

On Wed, 1 Dec 2010 10:52:18 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * Balbir Singh <balbir@...ux.vnet.ibm.com> [2010-12-01 10:16:34]:
> 
> > * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2010-12-01 10:23:29]:
> > 
> > > On Tue, 30 Nov 2010 15:45:55 +0530
> > > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > > 
> > > > Refactor zone_reclaim, move reusable functionality outside
> > > > of zone_reclaim. Make zone_reclaim_unmapped_pages modular
> > > > 
> > > > Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> > > 
> > > Why is this min_mapped_pages based on zone (IOW, per-zone) ?
> > >
> > 
> > Kamezawa-San, this has been the design before the refactoring (it is
> > based on zone_reclaim_mode and reclaim based on top of that).  I am
> > reusing bits of existing technology. The advantage of it being
> > per-zone is that it integrates well with kswapd. 
> >
> 

Sorry, what I wanted to here was:

Why min_mapped_pages per zone ?
Why you don't add "limit_for_unmapped_page_cache_size" for the whole system ?

I guess what you really want is "limit_for_unmapped_page_cache_size".

Then, you have to use this kind of mysterious code.
==
(zone_unmapped_file_pages(zone) >
+			UNMAPPED_PAGE_RATIO * zone->min_unmapped_pages))

Thanks,
-Kame

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