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SubjectRe: CONFIG_PRINTK_TIME broken on git HEAD ?
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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 ?

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?




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