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Bug 1140960

Summary: present memballoon statistic period in live xml
Product: Red Hat Enterprise Linux 7 Reporter: Jincheng Miao <jmiao>
Component: libvirtAssignee: Libvirt Maintainers <libvirt-maint>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.1CC: dyuan, eskultet, honzhang, lcheng, mzhan, rbalakri
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: libvirt-1.2.13-1.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-11-19 05:46:49 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Jincheng Miao 2014-09-12 06:34:02 UTC 
Description of problem:
Balloon memory statistic period could be set by dommemstat.
But after set, this period value is not present in live xml

Version-Release number of selected component (if applicable):
libvirt-1.2.8-1.el7.x86_64
qemu-kvm-rhev-2.1.0-3.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. start a guest with virtio memballoon:
# virsh start r7a

# virsh dumpxml r7a | grep -1 memballoon
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>

2. set period by dommemstat
# virsh dommemstat r7a
actual 1048576
rss 182036

# virsh dommemstat r7a --period 2

# virsh dommemstat r7a
actual 1048576
swap_in 0
swap_out 0
major_fault 387
minor_fault 708324
unused 831132
available 1017984
rss 276916

3. check the live xml, no period
#  virsh dumpxml r7a | grep -1 memb
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>
  </devices>

Expect result:
in step3:
show < stats> element.
Comment 2 Erik Skultety 2014-10-10 11:50:22 UTC 
Fixed upstream:

commit e3a7b8740fb4be15d9ba4f49f65bb9ee743730a0
Author: Erik Skultety <eskultet>
Date:   Thu Oct 2 14:48:02 2014 +0200

    qemu: Fix updating balloon period in live XML
    
    Up until now, we set memballoon period in monitor successfully, however
    we did not update domain definition structure, thus dumpxml was omitting
    period attribute in memballoon element

v1.2.9-12-ge3a7b87
Comment 4 lcheng 2015-04-20 02:12:06 UTC 
Verify the issue as follows. The result is expected. Move to VERIFIED.


[root@localhost ~]# rpm -q libvirt
libvirt-1.2.14-1.el7.x86_64

[root@localhost ~]# virsh start 7
Domain 7 started

[root@localhost ~]# virsh dumpxml 7 | grep -1 memballoon
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>
  </devices>

[root@localhost ~]# virsh dommemstat 7
actual 1048576
rss 319908

[root@localhost ~]# virsh dommemstat 7 --period 2

[root@localhost ~]# virsh dommemstat 7
actual 1048576
swap_in 0
swap_out 0
major_fault 567
minor_fault 2881200
unused 805660
available 1017212
rss 319908

[root@localhost ~]# virsh dumpxml 7 | grep  memballoon -A10
    <memballoon model='virtio'>
      <stats period='2'/>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>
  </devices>
...

[root@localhost ~]# virsh dommemstat 7 --period 0

[root@localhost ~]# virsh dumpxml 7 | grep  memballoon -A10
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>
  </devices>
...

[root@localhost ~]# virsh dommemstat 7
actual 1048576
swap_in 0
swap_out 0
major_fault 567
minor_fault 2888956
unused 805660
available 1017212
rss 319908
Comment 7 errata-xmlrpc 2015-11-19 05:46:49 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-2015-2202.html