linux-kernel - Re: [PATCH] ipc,shm: disable shmmax and shmall by default

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

> 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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