Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964928AbVITIhz (ORCPT ); Tue, 20 Sep 2005 04:37:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964931AbVITIhz (ORCPT ); Tue, 20 Sep 2005 04:37:55 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:25325 "EHLO mx2.mail.elte.hu") by vger.kernel.org with ESMTP id S964928AbVITIhy (ORCPT ); Tue, 20 Sep 2005 04:37:54 -0400 Date: Tue, 20 Sep 2005 09:14:01 +0200 From: Ingo Molnar To: Thomas Gleixner Cc: Christoph Lameter , linux-kernel@vger.kernel.org, akpm@osdl.org, george@mvista.com, johnstul@us.ibm.com, paulmck@us.ibm.com Subject: Re: [ANNOUNCE] ktimers subsystem Message-ID: <20050920071401.GB14285@elte.hu> References: <20050919184834.1.patchmail@tglx.tec.linutronix.de> <1127168232.24044.265.camel@tglx.tec.linutronix.de> <1127169849.24044.279.camel@tglx.tec.linutronix.de> <1127171542.24044.301.camel@tglx.tec.linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1127171542.24044.301.camel@tglx.tec.linutronix.de> User-Agent: Mutt/1.4.2.1i X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1110 Lines: 25 * Thomas Gleixner wrote: > > Applications call gettimeofday for a variety of reasons. One is because it > > is widely available over different platformsn and application want to > > schedule things, need timestamps etc etc. > > Accepted. But I still doubt that the number of calls to gettimeofday > is in anyway justified. The question I'm asking if it is really worth > a long and epic discussion about a single add instruction ? it is absolutely and emphatically not worth it. even in a hypothetical scenario [which this patchset is _not_ analogous to] where a new, clean subsystem introduces significant overhead, but the old subsystem is unclean, we frequently go with the new one - because it's so much easier to speed up something that is clean, robust and well-designed, than something that has been cobbled together! Ingo - 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/