lkml.org 
[lkml]   [2015]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 0/2] Quieten softlockup detector on virtualised kernels
From
Date
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(-)
>




\
 
 \ /
  Last update: 2015-02-02 06:41    [W:0.189 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site