Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265492AbUIIPMM (ORCPT ); Thu, 9 Sep 2004 11:12:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265517AbUIIPML (ORCPT ); Thu, 9 Sep 2004 11:12:11 -0400 Received: from mx1.elte.hu ([157.181.1.137]:1450 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S265492AbUIIPL7 (ORCPT ); Thu, 9 Sep 2004 11:11:59 -0400 Date: Thu, 9 Sep 2004 17:12:28 +0200 From: Ingo Molnar To: Mark_H_Johnson@raytheon.com Cc: Lee Revell , Free Ekanayaka , Eric St-Laurent , linux-kernel , "K.R. Foley" , Felipe Alfaro Solana , Daniel Schmitt , "P.O. Gaillard" , nando@ccrma.stanford.edu, luke@audioslack.com, free78@tin.it Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R1 Message-ID: <20040909151228.GA16804@elte.hu> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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: 947 Lines: 22 * Mark_H_Johnson@raytheon.com wrote: > 00000004 0.005ms (+0.321ms): send_IPI_mask_bitmask (flush_tlb_others) > 00010004 0.327ms (+0.000ms): do_nmi (flush_tlb_others) > 00010004 0.327ms (+0.003ms): do_nmi (kallsyms_lookup) these traces happen if you forget to do 'dmesg -n 1' to turn off console output. One CPU does a latency-printout with interrupts disabled, and this CPU keeps waiting in flush_tlb_others(). The second do_nmi() entry (which is a special one, showing the other CPU's activity) indeed shows that the CPU is executing in kallsyms_lookup() - possibly it's in the middle of a latency printout. i havent seen such type of traces with 'dmesg -n 1'. 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/