From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762728AbYEHLBv (ORCPT ); Thu, 8 May 2008 07:01:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754528AbYEHLBk (ORCPT ); Thu, 8 May 2008 07:01:40 -0400 Received: from smtp-out01.alice-dsl.net ([88.44.60.11]:59474 "EHLO smtp-out01.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752554AbYEHLBj (ORCPT ); Thu, 8 May 2008 07:01:39 -0400 Message-ID: <4822DD4E.3010000@googlemail.com> Date: Thu, 08 May 2008 13:00:30 +0200 From: Gabriel C User-Agent: Thunderbird 2.0.0.14 (X11/20080502) MIME-Version: 1.0 To: Andrew Morton CC: linux-kernel@vger.kernel.org, "Rafael J. Wysocki" , Peter Zijlstra , Ingo Molnar Subject: Re: CONFIG_PRINTK_TIME broken on git HEAD ? References: <48222C7C.2050807@googlemail.com> <20080507154155.2b472bb1.akpm@linux-foundation.org> <482233CD.70502@googlemail.com> In-Reply-To: <482233CD.70502@googlemail.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 08 May 2008 10:53:39.0036 (UTC) FILETIME=[C5B4B9C0:01C8B0F9] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Gabriel C wrote: > Andrew Morton wrote: >> On Thu, 08 May 2008 00:26:04 +0200 >> Gabriel C wrote: >> >>> Hi all, >>> >>> I've updated today to 2.6.26-rc1-00166-gc0a1811 , running an 64bit kernel at the moment. >> Which kernel were you runing previously? > > 2.6.25* , tested 2.6.25-git* , 2.6.26-rc1 , and 2.6.26-rc1-00065-g5717922. > > >>>From my log 2.6.26-rc1-00065-g5717922 was fine. > > ... > > May 6 00:13:14 thor kernel: [ 0.000000] Allocating PCI resources starting at d0000000 (gap: cf600000:2f800000) > May 6 00:13:14 thor kernel: [ 0.000000] SMP: Allowing 4 CPUs, 0 hotplug CPUs > May 6 00:13:14 thor kernel: [ 0.000000] PERCPU: Allocating 41732 bytes of per cpu data > May 6 00:13:14 thor kernel: [ 0.000000] Kernel command line: root=/dev/sdb1 ro debug vga=0x317 > May 6 00:13:14 thor kernel: [ 0.000000] Preemptible RCU implementation. > May 6 00:13:14 thor kernel: [ 0.000000] Extended CMOS year: 2000 > May 6 00:13:14 thor kernel: [ 0.000000] TSC calibrated against PM_TIMER > May 6 00:13:14 thor kernel: [ 0.000014] time.c: Detected 2499.952 MHz processor. > May 6 00:13:14 thor kernel: [ 0.000032] console [tty0] enabled > May 6 00:13:14 thor kernel: [ 0.000999] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes) > May 6 00:13:14 thor kernel: [ 0.000999] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes) > May 6 00:13:14 thor kernel: [ 0.000999] Checking aperture... > > ... > >>> dmesg shows here : >>> >>> ... >>> >>> >>> [ 0.000000] Allocating PCI resources starting at d0000000 (gap: cf600000:2f800000) >>> [ 0.000000] SMP: Allowing 4 CPUs, 0 hotplug CPUs >>> [ 0.000000] PERCPU: Allocating 42756 bytes of per cpu data >>> [ 0.000000] NR_CPUS: 8, nr_cpu_ids: 4 >>> [4294014.506571] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 1010753 >>> [4294014.506571] Kernel command line: root=/dev/sdb1 ro debug vga=0x317 >>> [4294014.506571] Initializing CPU#0 >>> [4294014.506571] Preemptible RCU implementation. >>> [4294014.506571] PID hash table entries: 4096 (order: 12, 32768 bytes) >>> >>> ... >>> >>> >>> Is this a known issue ? >>> >> Not to me. >> > I've bisected it. git bisect log git-bisect start # good: [2ddcca36c8bcfa251724fe342c8327451988be0d] Linux 2.6.26-rc1 git-bisect good 2ddcca36c8bcfa251724fe342c8327451988be0d # bad: [3de2403e6659d71b36ec820dc9b942762ddfe6eb] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 git-bisect bad 3de2403e6659d71b36ec820dc9b942762ddfe6eb # bad: [aac6abca858386438d9a7233c3471d2ecfa2f704] sched: default to n for GROUP_SCHED and FAIR_GROUP_SCHED git-bisect bad aac6abca858386438d9a7233c3471d2ecfa2f704 # good: [45ea2103d8856454503b30464cc1dba378748d00] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-fixes git-bisect good 45ea2103d8856454503b30464cc1dba378748d00 # good: [5717922a1b8cc477f45a0f4f11fe619392ba7133] Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb git-bisect good 5717922a1b8cc477f45a0f4f11fe619392ba7133 # good: [b328ca182f01c2a04b85e0ee8a410720b104fbcc] sched: fix hrtick_start_fair and CPU-Hotplug git-bisect good b328ca182f01c2a04b85e0ee8a410720b104fbcc # good: [712555ee4f873515612f89554ad1a3fda5fa887e] sched: fix missing locking in sched_domains code git-bisect good 712555ee4f873515612f89554ad1a3fda5fa887e # good: [dfbf4a1bc319f0f9a31e39b2da1fa5c55e85af89] sched: fix cpu clock git-bisect good dfbf4a1bc319f0f9a31e39b2da1fa5c55e85af89 # bad: [3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd] sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK git-bisect bad 3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd # good: [a5574cf65b5f03ce9ade3918764fe22e5e2371e3] sched, x86: add HAVE_UNSTABLE_SCHED_CLOCK git-bisect good a5574cf65b5f03ce9ade3918764fe22e5e2371e3 cat ./.git/refs/bisect/bad 3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd git show 3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd commit 3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd Author: Peter Zijlstra Date: Sat May 3 18:29:28 2008 +0200 sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK this replaces the rq->clock stuff (and possibly cpu_clock()). - architectures that have an 'imperfect' hardware clock can set CONFIG_HAVE_UNSTABLE_SCHED_CLOCK - the 'jiffie' window might be superfulous when we update tick_gtod before the __update_sched_clock() call in sched_clock_tick() - cpu_clock() might be implemented as: sched_clock_cpu(smp_processor_id()) if the accuracy proves good enough - how far can TSC drift in a single jiffie when considering the filtering and idle hooks? [ mingo@elte.hu: various fixes and cleanups ] Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar Gabriel