lkml.org 
[lkml]   [2011]   [Aug]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC PATCH 0/3] Avoid soft lockup message when KVM is stopped by host
On 08/03/2011 05:24 PM, Eric B Munson wrote:
> This set is just a rough first pass at avoiding soft lockup warnings when a host
> pauses the execution of a guest. A flag is set by the host in the shared page
> used for the pvclock when the host goes to stop the guest. When the guest
> resumes and detects a soft lockup, this flag is checked and cleared and the soft
> lockup message is skipped.

While this will cover the case were the host stops a guest, there will
be other plain cases where the host is just over committed and will
cause a softlockup false positive on the guest.

Softlockup should use stolen time that makes use of the guest running
info would cover both cases

>
> This currently breaks the build for non-x86 architectures but part of what I am
> looking for here is how to go about adding the function stubs for everything
> else.
>
> Eric B Munson (3):
> Add flag to indicate that a vm was stopped by the host
> Add functions to check if the host has stopped the vm
> Add check for suspended vm in softlockup detector
>
> arch/x86/include/asm/pvclock-abi.h | 1 +
> arch/x86/include/asm/pvclock.h | 3 +++
> arch/x86/kernel/kvmclock.c | 12 ++++++++++++
> kernel/watchdog.c | 11 +++++++++++
> 4 files changed, 27 insertions(+), 0 deletions(-)
>



\
 
 \ /
  Last update: 2011-08-04 10:39    [W:0.052 / U:0.520 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site