linux-kernel - Re: [PATCH] ipc,shm: increase default size for shmmax

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Message-ID: <20140402155507.1d976144@alan.etchedpixels.co.uk>
Date:	Wed, 2 Apr 2014 15:55:07 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Davidlohr Bueso <davidlohr@...com>,
	Manfred Spraul <manfred@...orfullife.com>, aswin@...com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Gotou, Yasunori" <y-goto@...fujitsu.com>,
	chenhanxiao <chenhanxiao@...fujitsu.com>,
	Gao feng <gaofeng@...fujitsu.com>
Subject: Re: [PATCH] ipc,shm: increase default size for shmmax

> Why aren't people just setting the sysctl to a petabyte?  What problems
> would that lead to?

Historically - hanging on real world desktop systems when someone
accidentally creates a giant SHM segment and maps it.

If you are running with vm overcmmit set to actually do checks then it
*shouldn't* blow up nowdays.

More to the point wtf are people still using prehistoric sys5 IPC APIs
not shmemfs/posix shmem ?

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