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

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Message-Id: <20080116104536.11AE.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 16 Jan 2008 10:48:55 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Daniel Sp蚣g" 
	<daniel.spang@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com, "Rik van Riel" <riel@...hat.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"Marcelo Tosatti" <marcelo@...ck.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 4/5] memory_pressure_notify() caller

Hi Daniel

> > > The notification fires after only ~100 MB allocated, i.e., when page
> > > reclaim is beginning to nag from page cache. Isn't this a bit early?
> > > Repeating the test with swap enabled results in a notification after
> > > ~600 MB allocated, which is more reasonable and just before the system
> > > starts to swap.
> >
> > Your issue may have more to do with the fact that the
> > highmem zone is 128MB in size and some balancing issues
> > between __alloc_pages and try_to_free_pages.
> 
> I don't think so. I ran the test again without highmem and noticed the
> same behaviour:

Thank you for good point out!
Could you please post your test program and reproduced method?

unfortunately,
my simple test is so good works in swapless system ;-)

thanks.



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