Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262082AbVCAWOZ (ORCPT ); Tue, 1 Mar 2005 17:14:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262088AbVCAWOZ (ORCPT ); Tue, 1 Mar 2005 17:14:25 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:13973 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S262082AbVCAWOW (ORCPT ); Tue, 1 Mar 2005 17:14:22 -0500 Subject: Re: [PATCH] New operation for kref to help avoid locks From: Arjan van de Ven To: Corey Minyard Cc: Greg KH , Sergey Vlasov , lkml In-Reply-To: <4224E499.5060800@acm.org> References: <42209BFD.8020908@acm.org> <20050226232026.5c12d5b0.vsu@altlinux.ru> <4220F6C8.4020002@acm.org> <20050301201528.GA23484@kroah.com> <1109710964.6293.166.camel@laptopd505.fenrus.org> <4224E499.5060800@acm.org> Content-Type: text/plain Date: Tue, 01 Mar 2005 23:14:15 +0100 Message-Id: <1109715256.6293.180.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.0.2 (2.0.2-3) Content-Transfer-Encoding: 7bit X-Spam-Score: 4.1 (++++) X-Spam-Report: SpamAssassin version 2.63 on pentafluge.infradead.org summary: Content analysis details: (4.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.3 RCVD_NUMERIC_HELO Received: contains a numeric HELO 1.1 RCVD_IN_DSBL RBL: Received via a relay in list.dsbl.org [] 2.5 RCVD_IN_DYNABLOCK RBL: Sent directly from dynamic IP address [80.57.133.107 listed in dnsbl.sorbs.net] 0.1 RCVD_IN_SORBS RBL: SORBS: sender is listed in SORBS [80.57.133.107 listed in dnsbl.sorbs.net] X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 478 Lines: 14 > Just doing an atomic operation is not faster than doing a lock, an > atomic operation, then an unlock? Am I missing something? if the lock and the atomic are on the same cacheline they're the same cost on most modern cpus... - 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/