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From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Date: Thu, 3 Apr 2014 19:47:47 -0400
Message-ID: <CAHGf_=redqDuXKGVV92n1xS+TxNPFdY9QNdm=LCZrp0RboZZJg@mail.gmail.com>
Subject: Re: [PATCH] ipc,shm: disable shmmax and shmall by default
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To: Davidlohr Bueso <davidlohr@hp.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Manfred Spraul <manfred@colorfullife.com>, aswin@hp.com, LKML <linux-kernel@vger.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Greg Thelen <gthelen@google.com>, Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

> This change allows Linux to treat shm just as regular anonymous memory.
> One important difference between them, though, is handling out-of-memory
> conditions: as opposed to regular anon memory, the OOM killer will not
> kill processes that are hogging memory through shm, allowing users to
> potentially abuse this. To overcome this situation, the shm_rmid_forced
> option must be enabled.

Off topic: systemd implemented similar feature RemoveIPC and it is
enabled by default.
http://lists.freedesktop.org/archives/systemd-devel/2014-March/018232.html

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