linux-kernel - Re: [patch 7/8] fdmap v2

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Date:	Sat, 9 Jun 2007 21:03:23 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@....linux.org.uk>
cc:	Kyle Moffett <mrmacman_g4@....com>,
	Ulrich Drepper <drepper@...hat.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2



On Sun, 10 Jun 2007, Al Viro wrote:

> On Sat, Jun 09, 2007 at 08:48:39PM -0700, Linus Torvalds wrote:
> > Agreed. That was actually part of the reason why I thought clone() was
> > much better than the pthreads interface.
> > 
> > That said, the Linux !CLONE_FILES does have downsides:
> > 
> >  - it is potentially much slower to do than sharing everything (if you 
> >    have lots of file descriptors, incrementing the refcounts etc is 
> >    actually a real overhead)
> 
> Huh?  We _skip_ the overhead when descriptor table is not shared.

Not for clone()/exit(), ie the actual _creation_ of the thread.

		Linus
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