Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268107AbUJCUDh (ORCPT ); Sun, 3 Oct 2004 16:03:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268111AbUJCUDh (ORCPT ); Sun, 3 Oct 2004 16:03:37 -0400 Received: from scanner2.mail.elte.hu ([157.181.151.9]:49387 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S268107AbUJCUDd (ORCPT ); Sun, 3 Oct 2004 16:03:33 -0400 Date: Sun, 3 Oct 2004 22:05:13 +0200 From: Ingo Molnar To: Lee Revell Cc: linux-kernel , "K.R. Foley" , Rui Nuno Capela Subject: Re: [patch] voluntary-preempt-2.6.9-rc2-mm4-S7 Message-ID: <20041003200513.GA32090@elte.hu> References: <20040919122618.GA24982@elte.hu> <414F8CFB.3030901@cybsft.com> <20040921071854.GA7604@elte.hu> <20040921074426.GA10477@elte.hu> <20040922103340.GA9683@elte.hu> <20040923122838.GA9252@elte.hu> <20040923211206.GA2366@elte.hu> <20040924074416.GA17924@elte.hu> <20040928000516.GA3096@elte.hu> <1096785457.1837.0.camel@krustophenia.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1096785457.1837.0.camel@krustophenia.net> 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 Content-Length: 1173 Lines: 30 * Lee Revell wrote: > This one was caused by amlat: > > preemption latency trace v1.0.7 on 2.6.9-rc2-mm4-VP-S7 > ------------------------------------------------------- > latency: 264 us, entries: 5 (5) | [VP:1 KP:1 SP:1 HP:1 #CPUS:1] > ----------------- > | task: amlat/3921, uid:1000 nice:0 policy:1 rt_prio:99 > ----------------- > => started at: rtc_open+0x12/0x270 > => ended at: rtc_open+0x13f/0x270 > =======> > 00000001 0.000ms (+0.264ms): rtc_open (misc_open) > 00000001 0.264ms (+0.000ms): sub_preempt_count (rtc_open) > 00000001 0.265ms (+0.000ms): update_max_trace (check_preempt_timing) > 00000001 0.265ms (+0.000ms): _mmx_memcpy (update_max_trace) > 00000001 0.265ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy) weird, there's nothing in that function that should cause _any_ delay. Is this drivers/char/rtc.c's rtc_open()? Also, how reproducible is this delay? 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/