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Message-ID: <alpine.LFD.0.98.0706092102300.20321@woody.linux-foundation.org>
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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