From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264937AbUHHCbO (ORCPT ); Sat, 7 Aug 2004 22:31:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264973AbUHHCbO (ORCPT ); Sat, 7 Aug 2004 22:31:14 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:9352 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S264937AbUHHCbC (ORCPT ); Sat, 7 Aug 2004 22:31:02 -0400 Subject: Re: [patch] preempt-timing-on-2.6.8-rc2-O2 From: Lee Revell To: Ingo Molnar Cc: William Lee Irwin III , linux-kernel In-Reply-To: <20040802105100.GA22855@elte.hu> References: <1091234100.1677.41.camel@mindpipe> <1091403477.862.4.camel@mindpipe> <1091407585.862.40.camel@mindpipe> <20040802073938.GA8332@elte.hu> <1091435237.3024.9.camel@mindpipe> <20040802092855.GA15894@elte.hu> <20040802100815.GA18349@elte.hu> <20040802101840.GB2334@holomorphy.com> <20040802103516.GA20584@elte.hu> <20040802105100.GA22855@elte.hu> Content-Type: text/plain Message-Id: <1091932214.1150.3.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Sat, 07 Aug 2004 22:31:06 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2004-08-02 at 06:51, Ingo Molnar wrote: > Newest patch at: > > http://redhat.com/~mingo/voluntary-preempt/preempt-timing-on-2.6.8-rc2-O2 > I get a *lot* of these: (swapper/0): 996us non-preemptible critical section violated 100 us preempt threshold starting at schedule+0x55/0x5a0 and ending at do_IRQ+0x110/0x180 [] dump_stack+0x17/0x20 [] dec_preempt_count+0x3c/0x50 [] do_IRQ+0x110/0x180 [] common_interrupt+0x18/0x20 [] cpu_idle+0x32/0x50 [] start_kernel+0x1a2/0x1f0 [] 0xc010019f This has to be a false positive, because if there were really ~1ms non-preemptible critical sections all over the place I would be getting xruns. Lee