linux-kernel - Re: [PATCH] mm: add config option to select the initial overcommit mode

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Message-ID: <20160513080458.GF20141@dhcp22.suse.cz>
Date:	Fri, 13 May 2016 10:04:58 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Sebastian Frias <sf84@...oste.net>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, mason <slash.tmp@...e.fr>
Subject: Re: [PATCH] mm: add config option to select the initial overcommit
 mode

On Tue 10-05-16 13:56:30, Sebastian Frias wrote:
[...]
> NOTE: I understand that the overcommit mode can be changed dynamically thru
> sysctl, but on embedded systems, where we know in advance that overcommit
> will be disabled, there's no reason to postpone such setting.

To be honest I am not particularly happy about yet another config
option. At least not without a strong reason (the one above doesn't
sound that way). The config space is really large already.
So why a later initialization matters at all? Early userspace shouldn't
consume too much address space to blow up later, no?

-- 
Michal Hocko
SUSE Labs