From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265086AbUHJOQt (ORCPT ); Tue, 10 Aug 2004 10:16:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265022AbUHJOQt (ORCPT ); Tue, 10 Aug 2004 10:16:49 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:9447 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S265099AbUHJOQi (ORCPT ); Tue, 10 Aug 2004 10:16:38 -0400 Subject: Re: [patch] voluntary-preempt-2.6.8-rc3-O4 From: Lee Revell To: Ingo Molnar Cc: Florian Schmidt , linux-kernel , Felipe Alfaro Solana In-Reply-To: <20040810075331.GB25238@elte.hu> References: <1090832436.6936.105.camel@mindpipe> <20040726124059.GA14005@elte.hu> <20040726204720.GA26561@elte.hu> <20040729222657.GA10449@elte.hu> <20040801193043.GA20277@elte.hu> <20040809104649.GA13299@elte.hu> <20040809130558.GA17725@elte.hu> <20040809190201.64dab6ea@mango.fruits.de> <1092103522.761.2.camel@mindpipe> <1092117141.761.15.camel@mindpipe> <20040810075331.GB25238@elte.hu> Content-Type: text/plain Message-Id: <1092147415.5818.2.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Tue, 10 Aug 2004 10:16:55 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2004-08-10 at 03:53, Ingo Molnar wrote: > can you trigger similar latencies via the attached mlock testcode? > (written by Florian. Run it as root.) > Yup, using only 100000 bytes, I get a bunch of these: (mlockall-test/6561): 10353us non-preemptible critical section violated 1100 us preempt threshold starting at get_user_pages+0xa6/0x3b0 and ending at get_user_pages+0x2c5/0x3b0 [] dump_stack+0x17/0x20 [] dec_preempt_count+0x3c/0x50 [] get_user_pages+0x2c5/0x3b0 [] make_pages_present+0x68/0x90 [] mlock_fixup+0x8d/0xb0 [] do_mlockall+0x70/0x90 [] sys_mlockall+0x99/0xa0 [] syscall_call+0x7/0xb ALSA /home/rlrevell/cvs/alsa/alsa-driver/alsa-kernel/core/pcm_lib.c:139: XRUN: pcmC0D2c [] dump_stack+0x17/0x20 [] snd_pcm_period_elapsed+0x27b/0x3e0 [snd_pcm] [] snd_emu10k1_interrupt+0xd1/0x3c0 [snd_emu10k1] [] generic_handle_IRQ_event+0x33/0x60 [] do_IRQ+0xb2/0x180 [] common_interrupt+0x18/0x20 [] check_preempt_timing+0x11/0xf0 [] touch_preempt_timing+0x32/0x40 [] get_user_pages+0xa6/0x3b0 [] make_pages_present+0x68/0x90 [] mlock_fixup+0x8d/0xb0 (mlockall-test/6561): 9168us non-preemptible critical section violated 1100 us preempt threshold starting at get_user_pages+0x2cf/0x3b0 and ending at get_user_pages+0xa6/0x3b0 [] dump_stack+0x17/0x20 [] touch_preempt_timing+0x32/0x40 [] get_user_pages+0xa6/0x3b0 [] make_pages_present+0x68/0x90 [] mlock_fixup+0x8d/0xb0 [] do_mlockall+0x70/0x90 [] sys_mlockall+0x99/0xa0 [] syscall_call+0x7/0xb Lee