linux-kernel - Re: [RFC][PATCH 4/5] memory_pressure

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Message-Id: <20080115120110.1194.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue, 15 Jan 2008 12:08:52 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Marcelo Tosatti <marcelo@...ck.org>,
	Daniel Spang <daniel.spang@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 4/5] memory_pressure_notify() caller

Hi Kame,

> > > > +	notify_threshold = (zone->pages_high +
> > > > +			    zone->lowmem_reserve[MAX_NR_ZONES-1]) * 2;
> > > > +
> > > Why MAX_NR_ZONES-1 ?
> > 
> > this is intent to max lowmem_reserve.
> > 
> Ah, my point is.. how about this ?
> ==
> if (page_zoneid(page) != ZONE_DMA)
> 	notify_threshold = zone->pages_high +
>                    	zone->lowmem_reserve[page_zoneid(page) - 1] * 2;

your point out is very good point.

but judged by zone size is more better, may be.
on some 64bit system, ZONE_DMA is 4GB.
small memory system can't ignore it. 

fortunately, zone size check can at free_area_init_core().


- kosaki



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