linux-kernel - Re: [PATCH v3] oom-kill: add lowmem usage aware oom kill handling

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Message-ID: <c6c48fdf7f746add49bb9cc058b513ae.squirrel@webmail-b.css.fujitsu.com>
Date:	Sat, 30 Jan 2010 01:25:43 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	vedran.furac@...il.com,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, rientjes@...gle.com,
	minchan.kim@...il.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>
Subject: Re: [PATCH v3] oom-kill: add lowmem usage aware oom kill handling

Alan Cox wrote:
>> panic_on_oom=1 works enough well.For Vedran's, overcommit memory will
>> work
>> well. But oom-killer kills very bad process if not tweaked.
>> So, I think some improvement should be done.
>
> That is why we have the per process oom_adj values - because for nearly
> fifteen years someone comes along and says "actually in my environment
> the right choice is ..."
>
> Ultimately it is policy. The kernel simply can't read minds.
>
If so, all heuristics other than vm_size should be purged, I think.
...Or victim should be just determined by the class of application
user sets. oom_adj other than OOM_DISABLE, searching victim process
by black magic are all garbage.

Thanks,
-Kame

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