Message-Id: <E1PHQ64-0001M1-OD@be1.7eggert.dyndns.org>
From: Bodo Eggert <7eggert@web.de>
Subject: Re: [PATCH] oom: allow a non-CAP_SYS_RESOURCE proces to oom_score_adj  down
To: Mandeep Singh Baines <msb@google.com>,
        David Rientjes <rientjes@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Rik van Riel <riel@redhat.com>, Ying Han <yinghan@google.com>,
        linux-kernel@vger.kernel.org, gspencer@chromium.org,
        piman@chromium.org, wad@chromium.org, olofj@chromium.org,
        Bodo Eggert <7eggert@web.de>
Reply-To: 7eggert@gmx.de
Date: Sun, 14 Nov 2010 01:05:28 +0100
References: <fNx73-1cI-1@gated-at.bofh.it> <fNzVf-5UY-3@gated-at.bofh.it> <fNKdY-6FU-11@gated-at.bofh.it> <fNMps-1S1-21@gated-at.bofh.it> <fNNOx-4qf-1@gated-at.bofh.it> <fNOAW-5Oi-35@gated-at.bofh.it> <fNPdF-6Hu-33@gated-at.bofh.it> <fOctz-4o0-9@gated-at.bofh.it>
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Mandeep Singh Baines <msb@google.com> wrote:

> We'd like to be able to oom_score_adj a process up/down as its
> enters/leaves the foreground. Currently, it is not possible to oom_adj
> down without CAP_SYS_RESOURCE. This patch allows a task to decrease
> its oom_score_adj back to the value that a CAP_SYS_RESOURCE thread set
> it or its inherited value at fork. Assuming the thread that has forked
> it has oom_score_adj of 0, each tab

process

> could decrease it back from 0 upon 
> activation unless a CAP_SYS_RESOURCE thread elevated it to something
> higher.


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