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SubjectRe: [PATCH 13/15] sched: Use a static_key for sched_clock_stable
On 2014.01.22 at 11:45 +0100, Peter Zijlstra wrote:
> On Tue, Jan 21, 2014 at 05:28:37PM -0500, Sasha Levin wrote:
> > On 12/12/2013 09:08 AM, Peter Zijlstra wrote:
> >
> > This patch seems to be causing an issue with booting a KVM guest. It seems that it
> > causes the time to go random during early boot process:
> >
> > [ 0.000000] Initmem setup node 30 [mem 0x12ee000000-0x138dffffff]
> > [ 0.000000] NODE_DATA [mem 0xcfa42000-0xcfa72fff]
> > [ 0.000000] NODE_DATA(30) on node 1
> > [ 0.000000] Initmem setup node 31 [mem 0x138e000000-0x142fffffff]
> > [ 0.000000] NODE_DATA [mem 0xcfa11000-0xcfa41fff]
> > [ 0.000000] NODE_DATA(31) on node 1
> > [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
> > [ 0.000000] kvm-clock: cpu 0, msr 0:cf991001, boot clock
> > [133538.294040] Zone ranges:
> > [133538.294338] DMA [mem 0x00001000-0x00ffffff]
> > [133538.294804] DMA32 [mem 0x01000000-0xffffffff]
> > [133538.295223] Normal [mem 0x100000000-0x142fffffff]
> > [133538.295670] Movable zone start for each node
> >

FYI it happens on real hardware on my machine:
...
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] NR_IRQS:4352 nr_irqs:712 16
[ 0.000000] spurious 8259A interrupt: IRQ7.
[ 0.000000] Console: colour VGA+ 80x25
[ 0.000000] console [tty0] enabled
[ 0.000000] hpet clockevent registered
[ 0.000000] tsc: Fast TSC calibration using PIT
[ 0.003333] tsc: Detected 3210.681 MHz processor
[ 60.375238] Calibrating delay loop (skipped), value calculated using timer frequency.. 6423.91 BogoMIPS (lpj=10702270)
[ 60.375240] pid_max: default: 32768 minimum: 301
[ 60.375259] Mount-cache hash table entries: 256
[ 60.375373] tseg: 0000000000
[ 60.375377] CPU: Physical Processor ID: 0
[ 60.375377] CPU: Processor Core ID: 0
[ 60.375378] mce: CPU supports 6 MCE banks
[ 60.375382] LVT offset 0 assigned for vector 0xf9
[ 60.375384] process: using AMD E400 aware idle routine
[ 60.375386] Last level iTLB entries: 4KB 512, 2MB 16, 4MB 8
...
--
Markus


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