From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263962AbUGMFwX (ORCPT ); Tue, 13 Jul 2004 01:52:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264584AbUGMFwX (ORCPT ); Tue, 13 Jul 2004 01:52:23 -0400 Received: from mail001.syd.optusnet.com.au ([211.29.132.142]:9143 "EHLO mail001.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S263962AbUGMFwW (ORCPT ); Tue, 13 Jul 2004 01:52:22 -0400 References: <200407121943.25196.devenyga@mcmaster.ca> <20040713024051.GQ21066@holomorphy.com> <200407122248.50377.devenyga@mcmaster.ca> <20040712210107.1945ac34.akpm@osdl.org> Message-ID: X-Mailer: http://www.courier-mta.org/cone/ From: Con Kolivas To: Andrew Morton Cc: devenyga@mcmaster.ca, ck@vds.kolivas.org, linux-kernel@vger.kernel.org, wli@holomorphy.com Subject: Re: Preempt Threshold Measurements Date: Tue, 13 Jul 2004 15:51:59 +1000 Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="US-ASCII" Content-Disposition: inline Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew Morton writes: > Con Kolivas wrote: >> Certainly the do_munmap and exit_mmap seem to be repeat offenders on my >> machine too (more the latter in my case). >> > > This is a false positive. Nothing is setting need_resched(), so > unmap_vmas() doesn't bother dropping the lock. Ok well excluding do_munmap and exit_mmap the ones that have shown up (some more frequently than others) are: 6ms at ksoftirqd+0x6b 2ms at sys_ioctl+0x47 2ms at b44_open 6ms at fget+0x28 2ms at write_ordered_buffers+0x37 4ms at blkdev_put+0x48 5ms at add_wait_queue+0x21 4ms at blkdev_put+0x48 and you were right; eventually the reiserfs ones showed up again at 6-8ms Now which of the above are not false positives and should I try to extract the exact locations of them? Con