linux-kernel - Re: [PATCH 4/8][for -mm] mem_notify v6: memory_pressure

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Message-Id: <20080214090740.C1B0.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Thu, 14 Feb 2008 09:25:26 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, marcelo@...ck.org,
	daniel.spang@...il.com, riel@...hat.com, alan@...rguk.ukuu.org.uk,
	linux-fsdevel@...r.kernel.org, pavel@....cz, a1426z@...ab.com,
	jonathan@...masters.org, zlynx@....org
Subject: Re: [PATCH 4/8][for -mm] mem_notify v6: memory_pressure_notify() caller

Hi Andi,

> > to be honest, I don't think at mem-cgroup until now.
> 
> There is not only mem-cgroup BTW, but also NUMA node restrictons from
> NUMA memory policy. So this means a process might not be able to access
> all memory.

you are right.
good point out.

current implementation may cause wake up the no relate process of
memory shortage zone ;-)

but unfortunately, we can't know per zone rss.
(/proc/[pid]/numa_maps is very slow, we can't use it
 at memory shortage emergency)

I think we need develop per zone rss.
it become not only improve mem_notify, but also improve
oom killer of more intelligent process choice.

but it is a bit difficult. (at least for me ;-)
may be, I will implement it a bit later...


Thanks again!
your good opnion may improve my patch.


- kosaki


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