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

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Message-ID: <20070610040642.GE21478@ftp.linux.org.uk>
Date:	Sun, 10 Jun 2007 05:06:42 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 Sat, Jun 09, 2007 at 09:03:23PM -0700, Linus Torvalds wrote:
> 
> 
> 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.

Umm...  Yes, but that depends on the time when that sucker is started and
the lifetime.  IOW, we really need specific examples.
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