Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760288AbXFJEG7 (ORCPT ); Sun, 10 Jun 2007 00:06:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755439AbXFJEGx (ORCPT ); Sun, 10 Jun 2007 00:06:53 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:55441 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754200AbXFJEGw (ORCPT ); Sun, 10 Jun 2007 00:06:52 -0400 Date: Sun, 10 Jun 2007 05:06:42 +0100 From: Al Viro To: Linus Torvalds Cc: Kyle Moffett , Ulrich Drepper , Davide Libenzi , Alan Cox , Theodore Tso , Eric Dumazet , Linux Kernel Mailing List , Andrew Morton , Ingo Molnar Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2 Message-ID: <20070610040642.GE21478@ftp.linux.org.uk> References: <20070609165454.GE4095@ftp.linux.org.uk> <466ADEAB.7080202@redhat.com> <20070609172429.GF4095@ftp.linux.org.uk> <2E51520E-EC73-457F-809A-4749ED9A3C97@mac.com> <20070609200645.GG4095@ftp.linux.org.uk> <20070610031922.GC21478@ftp.linux.org.uk> <20070610040014.GD21478@ftp.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1083 Lines: 26 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/