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Date: Thu, 14 Feb 2008 09:25:26 +0900
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH 4/8][for -mm] mem_notify v6: memory_pressure_notify() caller
Cc: kosaki.motohiro@jp.fujitsu.com, Andrew Morton <akpm@linux-foundation.org>,
       linux-mm@kvack.org, linux-kernel@vger.kernel.org, marcelo@kvack.org,
       daniel.spang@gmail.com, riel@redhat.com, alan@lxorguk.ukuu.org.uk,
       linux-fsdevel@vger.kernel.org, pavel@ucw.cz, a1426z@gawab.com,
       jonathan@jonmasters.org, zlynx@acm.org
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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