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From: Ulrich Drepper <drepper@gmail.com>
Date: Wed, 4 Apr 2012 13:49:26 -0400
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Subject: Re: [PATCH] nextfd(2)
To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Alexey Dobriyan <adobriyan@gmail.com>,
        akpm@linux-foundation.org, viro@zeniv.linux.org.uk,
        torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
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On Wed, Apr 4, 2012 at 13:07, KOSAKI Motohiro <kosaki.motohiro@gmail.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.