Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031199AbXFHSLf (ORCPT ); Fri, 8 Jun 2007 14:11:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S969757AbXFHSL1 (ORCPT ); Fri, 8 Jun 2007 14:11:27 -0400 Received: from x35.xmailserver.org ([64.71.152.41]:3441 "EHLO x35.xmailserver.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965636AbXFHSL0 (ORCPT ); Fri, 8 Jun 2007 14:11:26 -0400 X-AuthUser: davidel@xmailserver.org Date: Fri, 8 Jun 2007 11:11:24 -0700 (PDT) From: Davide Libenzi X-X-Sender: davide@alien.or.mcafeemobile.com To: Alan Cox cc: Theodore Tso , Ulrich Drepper , Eric Dumazet , Kyle Moffett , Linux Kernel Mailing List , Linus Torvalds , Andrew Morton , Ingo Molnar Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2 In-Reply-To: <20070608140150.6f31672f@the-village.bc.nu> Message-ID: References: <466741BD.20106@redhat.com> <20070607110432.73be7960@the-village.bc.nu> <20070607151243.22caab9e.dada1@cosmosbay.com> <466864F8.2050903@cosmosbay.com> <46686810.6030805@redhat.com> <466880A4.3090908@redhat.com> <20070608120746.GD12687@thunk.org> <20070608140150.6f31672f@the-village.bc.nu> 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: 971 Lines: 26 On Fri, 8 Jun 2007, Alan Cox wrote: > > Um, how cheap do you need it? get_random_int() is actually pretty > > cheep, since it was designed to be usable by the networking stack for > > sequence numbers for TCP packets; and it's not like sys_close() or > > sys_open() is a majorly critical path, is it? If the concern is > > At this point wouldn't it be cheaper to allocate file handles using a > different algorithm than firing up the RNG - say like in the POSIX > fashion ... The only reason we use a floating base, is because Uli preferred to have non-exactly predictable fd allocations. There no reason of re-doing the same POSIX mistake all over again: Errare humanum est, perseverare autem diabolicum - 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/