Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761924AbXFJDgQ (ORCPT ); Sat, 9 Jun 2007 23:36:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759308AbXFJDgE (ORCPT ); Sat, 9 Jun 2007 23:36:04 -0400 Received: from x35.xmailserver.org ([64.71.152.41]:1233 "EHLO x35.xmailserver.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758481AbXFJDgD (ORCPT ); Sat, 9 Jun 2007 23:36:03 -0400 X-AuthUser: davidel@xmailserver.org Date: Sat, 9 Jun 2007 20:35:55 -0700 (PDT) From: Davide Libenzi X-X-Sender: davide@alien.or.mcafeemobile.com To: Linus Torvalds cc: Al Viro , Kyle Moffett , Ulrich Drepper , Alan Cox , Theodore Tso , Eric Dumazet , Linux Kernel Mailing List , Andrew Morton , Ingo Molnar Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2 In-Reply-To: Message-ID: References: <20070609014140.GC4095@ftp.linux.org.uk> <466A0BFB.3070908@redhat.com> <20070609151521.GD4095@ftp.linux.org.uk> <466AD4BA.80407@redhat.com> <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> <20070609204907.GH4095@ftp.linux.org.uk> X-GPG-FINGRPRINT: CFAE 5BEE FD36 F65E E640 56FE 0974 BF23 270F 474E X-GPG-PUBLIC_KEY: http://www.xmailserver.org/davidel.asc MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 938 Lines: 27 On Sat, 9 Jun 2007, Linus Torvalds wrote: > On Sat, 9 Jun 2007, Al Viro wrote: > > > > Eww... Idea of pipe(2) taking flags as argument... > > Right. That was one of the patches, and it was one that I said was too > damn ugly to live. > > So I instead suggested the alternate approach of adding a single new > system call that runs another system call indirectly, with a set of flags > and/or other behaviour modifications. What if we put a data section in the vdso and we let userspace set the flags or whatever in there? Syslets could use one of those bits to set the "threadlet mode" w/out calling a syscall at all. In that way we have no new syscalls whatsoever. No? - Davide - 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/