linux-kernel - Re: [RFC][PATCH] a bit improvement of ZONE

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Date:	Fri, 18 Jan 2008 20:11:22 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Marcelo Tosatti <marcelo@...ck.org>,
	Rik van Riel <riel@...hat.com>,
	Daniel Spang <daniel.spang@...il.com>
Subject: Re: [RFC][PATCH] a bit improvement of ZONE_DMA page reclaim

Hi Andrew,

> > > on X86, ZONE_DMA is very very small.
> > > It is often no used at all. 
> > 
> > In that case page-reclaim is supposed to set all_unreclaimable and
> > basically ignores the zone altogether until it looks like something might
> > have changed.
> > 
> > Is that code not working?  (quite possible).
> 
> please insert blow debug printk and dd if=bigfile of=/dev/null.
> you see "near_oom(DMA) 0 0 0" messages :)

sorry, my last mail is not enough description.
It is not so useful at solo use. 
As you say, If long time passes all_unreclaimable turn on and 
incorrect shrink list become no happned.

but, my mem_notify patch very dislike incorrect shrink ;-)

result as, I don't hope quick merge.
and I will merge to my mem_notify patch series.

Thanks.


- kosaki


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