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Bug 1209891

Summary:	changing the pinning with virsh setvcpupin does not work
Product:	Red Hat Enterprise Linux 6	Reporter:	Jan Kurik <jkurik>
Component:	libvirt	Assignee:	Peter Krempa <pkrempa>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	6.6	CC:	dyuan, honzhang, jdenemar, jherrman, jsuchane, lhuang, mtessun, mzhan, pkrempa, pmanzell, pm-eus, rbalakri, rhodain, tscherf
Target Milestone:	rc	Keywords:	Regression, ZStream
Target Release:	---
Hardware:	x86_64
OS:	All
Whiteboard:
Fixed In Version:	libvirt-0.10.2-46.el6_6.6	Doc Type:	Bug Fix
Doc Text:	Previously, when the default CPU mask was specified while using Non-Uniform Memory Access (NUMA) pinning, virtual CPUs (vCPUs) could not be pinned to physical CPUs that were not contained in the default node mask. With this update, the control groups (cgroups) code correctly attaches only vCPU threads instead of the entire domain group, and using NUMA pinning with the default cpuset subsystem now works as expected.	Story Points:	---
Clone Of:	1198096	Environment:
Last Closed:	2015-04-29 10:10:14 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1198096
Bug Blocks:

Description Jan Kurik 2015-04-08 12:27:46 UTC

This bug has been copied from bug #1198096 and has been proposed
to be backported to 6.6 z-stream (EUS).

Comment 6 Jiri Denemark 2015-04-10 11:39:19 UTC

The patch for this bug introduces a memory leak.

Comment 8 Luyao Huang 2015-04-13 05:50:40 UTC

Verify this bug with libvirt-0.10.2-46.el6_6.6.x86_64 :

Steps:

1.
# valgrind --leak-check=full libvirtd
==8417== Memcheck, a memory error detector
==8417== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==8417== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==8417== Command: libvirtd
==8417== 

2. open another terminal and prepare a vm:

# virsh dumpxml r6
...
  <vcpu placement='static' cpuset='0-3'>4</vcpu>
...

3. start the vm:

# virsh start r6
Domain r6 started

4. check cgroup settings:

# cgget -g cpuset /libvirt/qemu/r6/vcpu3 |grep .cpus
cpuset.cpus: 0-3
# cgget -g cpuset /libvirt/qemu/r6/vcpu2 |grep .cpus
cpuset.cpus: 0-3
# cgget -g cpuset /libvirt/qemu/r6/vcpu1 |grep .cpus
cpuset.cpus: 0-3
# cgget -g cpuset /libvirt/qemu/r6 |grep .cpus
cpuset.cpus: 0-7
# cgget -g cpuset /libvirt/qemu/r6/emulator |grep .cpus
cpuset.cpus: 0-3

5. change vcpupin:
# virsh vcpupin r6 0 4-7

# virsh vcpupin r6 1 4-7

# virsh vcpupin r6 2 4-7

# virsh vcpupin r6 3 4-7


6. recheck cgroup

# cgget -g cpuset /libvirt/qemu/r6/vcpu1 |grep .cpus
cpuset.cpus: 4-7
# cgget -g cpuset /libvirt/qemu/r6/vcpu1 |grep .cpus
cpuset.cpus: 4-7
# cgget -g cpuset /libvirt/qemu/r6/vcpu2 |grep .cpus
cpuset.cpus: 4-7
# cgget -g cpuset /libvirt/qemu/r6/vcpu3 |grep .cpus
cpuset.cpus: 4-7
# cgget -g cpuset /libvirt/qemu/r6/emulator |grep .cpus
cpuset.cpus: 0-3
# cgget -g cpuset /libvirt/qemu/r6 |grep .cpus
cpuset.cpus: 0-7

7. check valgrind no memory leak around this issue.

Comment 12 errata-xmlrpc 2015-04-29 10:10:14 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0916.html