linux-kernel - Re: [PATCH] nextfd(2)

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Date:	Wed, 4 Apr 2012 13:49:26 -0400
From:	Ulrich Drepper <drepper@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] nextfd(2)

On Wed, Apr 4, 2012 at 13:07, KOSAKI Motohiro <kosaki.motohiro@...il.com> wrote:
> Umm... I'm sorry. I haven't catch why OOM is related topic. Could you please
> elaborate more?

With fork you always have some copy-on-write (and worse for
overcommit) just to then execute exec.  With a real spawn
implementation you wouldn't have that.  A big problem if you, for
instance, have to spawn a small helper from a gigantic process.
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