[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 02 Feb 2015 15:58:38 +1100
From: Cyril Bur <cyrilbur@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: mpe@...erman.id.au, drjones@...hat.com, dzickus@...hat.com,
linux-kernel@...r.kernel.org, mingo@...nel.org,
uobergfe@...hat.com, chaiw.fnst@...fujitsu.com, fabf@...net.be,
atomlin@...hat.com, benzh@...omium.org, schwidefsky@...ibm.com
Subject: Re: [PATCH v2 0/2] Quieten softlockup detector on virtualised
kernels
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(-)
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists