Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932688AbVISWY5 (ORCPT ); Mon, 19 Sep 2005 18:24:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932709AbVISWY4 (ORCPT ); Mon, 19 Sep 2005 18:24:56 -0400 Received: from omx2-ext.sgi.com ([192.48.171.19]:25056 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S932688AbVISWY4 (ORCPT ); Mon, 19 Sep 2005 18:24:56 -0400 Date: Mon, 19 Sep 2005 15:24:22 -0700 (PDT) From: Christoph Lameter To: Thomas Gleixner cc: linux-kernel@vger.kernel.org, mingo@elte.hu, akpm@osdl.org, george@mvista.com, johnstul@us.ibm.com, paulmck@us.ibm.com Subject: Re: [ANNOUNCE] ktimers subsystem In-Reply-To: <1127168232.24044.265.camel@tglx.tec.linutronix.de> Message-ID: References: <20050919184834.1.patchmail@tglx.tec.linutronix.de> <1127168232.24044.265.camel@tglx.tec.linutronix.de> 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: 1084 Lines: 24 On Tue, 20 Sep 2005, Thomas Gleixner wrote: > Also the basic prerequisite for for high resolution timers is a fast and > simple access to clock_monotonic rather than to a backward corrected > clock_realtime representation. Yup that may be a reason to tolerate the add for realtime. > We should rather ask glibc people why gettimeofday() / clock_getttime() > is called inside the library code all over the place for non obvious > reasons. You can ask lots of application vendors the same question because its all over lots of user space code. The fact is that gettimeofday() / clock_gettime() efficiency is very critical to the performance of many applications on Linux. That is why the addtion of one add instruction may better be carefully considered. Many platforms can execute gettimeofday without having to enter the kernel. - 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/