From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] Revert oom rewrite series
Cc: kosaki.motohiro@jp.fujitsu.com, David Rientjes <rientjes@google.com>,
        "Figo.zhang" <zhangtianfei@leadcoretech.com>,
        "Figo.zhang" <figo1802@gmail.com>, lkml <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Andrew Morton <akpm@osdl.org>,
        Linus Torvalds <torvalds@linux-foundation.org>
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References: <alpine.DEB.2.00.1011150204060.2986@chino.kir.corp.google.com> <20101115105735.0f9c1a22@lxorguk.ukuu.org.uk>
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Date: Tue, 23 Nov 2010 16:16:57 +0900 (JST)
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sorry for the delay.

> > The goal was to make the oom killer heuristic as predictable as possible 
> > and to kill the most memory-hogging task to avoid having to recall it and 
> > needlessly kill several tasks.
> 
> Meta question - why is that a good thing. In a desktop environment it's
> frequently wrong, in a server environment it is often wrong. We had this
> before where people spend months fiddling with the vm and make it work
> slightly differently and it suits their workload, then other workloads go
> downhill. Then the cycle repeats.
> 
> > You have full control over disabling a task from being considered with 
> > oom_score_adj just like you did with oom_adj.  Since oom_adj is 
> > deprecated for two years, you can even use the old interface until then.
> 
> Which changeset added it to the Documentation directory as deprecated ?

It's insufficient.
a63d83f427fbce97a6cea0db2e64b0eb8435cd10 (oom: badness heuristic rewrite)
introduced a lot of incompatibility to oom_adj and oom_score.
Theresore I would sugestted full revert and resubmit some patches which
cherry pick no pain piece.


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