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    SubjectRe: CONFIG_PRINTK_TIME broken on git HEAD ?
    Peter Zijlstra wrote:
    > On Thu, 2008-05-08 at 13:00 +0200, Gabriel C wrote:
    >
    >>> >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)
    >
    >
    >> I've bisected it.
    >
    >> cat ./.git/refs/bisect/bad
    >> 3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd
    >>
    >> git show 3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd
    >> commit 3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd
    >> Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
    >> 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 <a.p.zijlstra@chello.nl>
    >> Signed-off-by: Ingo Molnar <mingo@elte.hu>
    >>
    >
    > Ok, so the issue is that the clock doesn't start at 0, but at:
    > 4294014.506571 ?

    At least on my box , yes.

    There is a similar report http://lkml.org/lkml/2008/5/8/100 , there it jumps to 42949372.961619


    > I guess that's a side-effect of using ktime to base the clock off.
    > Thomas, do we have a clock that is uptime based?
    >

    Gabriel


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