** Also affects: linux (Ubuntu Bionic)
Importance: High
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: Triaged
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Artful)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Artful)
Importance: Undecided => High
** Changed in: linux (Ubuntu Artful)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Bionic)
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) =>
Joseph Salisbury (jsalisbury)
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1755979
Title:
Cpu utilization showing system time for kvm guests (performance)
(sysstat)
Status in The Ubuntu-power-systems project:
Triaged
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Artful:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
== Comment: #0 - JENIFER HOPPER <jhop...@us.ibm.com> - 2018-03-14 16:20:47 ==
+++ This bug was initially created as a clone of Bug #163375 +++
---Problem Description---
All KVM guest cpu utilization is being reported as sys% time in the host.
It turns out Guest time accounting (CONFIG_VIRT_CPU_ACCOUNTING_GEN) has been
broken since v4.13 by commit:
commit 8b24e69fc47e43679bb29ddb481aa0e8dce2a3c5
Author: Paul Mackerras <pau...@ozlabs.org>
Date: Mon Jun 26 15:45:51 2017 +1000
KVM: PPC: Book3S HV: Close race with testing for signals on guest
entry
---
That is now fixed and upstream accepted in Paulus' tree as git commit:
https://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc.git/commit/?h=kvm-ppc-fixes&id=61bd0f66ff92d5ce765ff9850fd3cbfec773c560
("KVM: PPC: Book3S HV: Fix guest time accounting with
VIRT_CPU_ACCOUNTING_GEN")
Please include this patch in Ubuntu so that guest cpu accounting is correct.
Contact Information = jhop...@us.ibm.com
---uname output---
Linux ltc-b114 4.15.0-10-generic #11-Ubuntu SMP Tue Feb 13 18:21:52 UTC 2018
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = 5104-22C
---Debugger---
A debugger is not configured
---Steps to Reproduce---
Start a KVM guest, run something that generates cpu utilization in the
guest, observe mpstat on the host.
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