From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263818AbUISUqx (ORCPT ); Sun, 19 Sep 2004 16:46:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263962AbUISUqx (ORCPT ); Sun, 19 Sep 2004 16:46:53 -0400 Received: from mx1.elte.hu ([157.181.1.137]:61843 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S263818AbUISUqv (ORCPT ); Sun, 19 Sep 2004 16:46:51 -0400 Date: Sun, 19 Sep 2004 22:48:41 +0200 From: Ingo Molnar To: Karsten Wiese Cc: linux-kernel@vger.kernel.org Subject: Re: [patch] voluntary-preempt-2.6.9-rc2-mm1-S1 Message-ID: <20040919204841.GA7004@elte.hu> References: <200409192232.20139.annabellesgarden@yahoo.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200409192232.20139.annabellesgarden@yahoo.de> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Karsten Wiese wrote: > Just 1 small correction: > >>>> > --- kernel/time.c~ 2004-09-19 15:09:38.000000000 +0200 > +++ kernel/time.c 2004-09-19 17:02:35.000000000 +0200 > @@ -96,8 +96,10 @@ > asmlinkage long sys_gettimeofday(struct timeval __user *tv, struct timezone > __user *tz) > { > #ifdef CONFIG_LATENCY_TRACE > - if (!tv && ((long)tz == 1)) > + if (!tv && ((long)tz == 1)) { > user_trace_start(); > + tz = NULL; > + } > if (!tv && !tz) > user_trace_stop(); The point is to let gettimeofday(0,1) start tracing and gettimeofday(0,0) stop tracing - a system-call-controlled tracing facility (if trace_enabled=2). This was used to trace weird latencies before, but it's not the normal mode of operation. Ingo