Re: [PATCH v2 0/2] Quieten softlockup detector on virtualised kernels

[Cyril Bur]

Hi Andrew,

Could you please pick these patches up through your tree?

Thanks,

Cyril

On Fri, 2015-01-09 at 14:34 +1100, Cyril Bur wrote:
> When the hypervisor pauses a virtualised kernel the kernel will observe a jump
> in timebase, this can cause spurious messages from the softlockup detector.
> 
> Whilst these messages are harmless, they are accompanied with a stack trace
> which causes undue concern and more problematically the stack trace in the
> guest has nothing to do with the observed problem and can only be misleading.
> 
> Futhermore, on POWER8 this is completely avoidable with the introduction of
> the Virtual Time Base (VTB) register.
> 
> V2:
> 	Remove the export of running_clock
> 	Added #ifdef CONFIG_PPC_PSERIES and optimised the non lpar + vtb cases.
> 	Replaced the use of sched_clock_with local_clock it was used originally in
> the softlockup detector.
> 
> Cyril Bur (2):
>   Add another clock for use with the soft lockup watchdog.
>   powerpc: add running_clock for powerpc to prevent spurious softlockup
>     warnings
> 
>  arch/powerpc/kernel/time.c | 32 ++++++++++++++++++++++++++++++++
>  include/linux/sched.h      |  1 +
>  kernel/sched/clock.c       | 13 +++++++++++++
>  kernel/watchdog.c          |  2 +-
>  4 files changed, 47 insertions(+), 1 deletion(-)
> 


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