Public bug reported: == 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. ** Affects: kernel-package (Ubuntu) Importance: Undecided Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Tags: architecture-ppc64le bugnameltc-165731 severity-high targetmilestone-inin--- ** Tags added: architecture-ppc64le bugnameltc-165731 severity-high targetmilestone-inin--- ** Changed in: ubuntu Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) ** Package changed: ubuntu => kernel-package (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1755979 Title: Cpu utilization showing system time for kvm guests (performance) (sysstat) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kernel-package/+bug/1755979/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
