Bug 518275

Summary:	RFE: [LTC 6.0 FEAT] libvirt control of ksm [202017]
Product:	Red Hat Enterprise Linux 6	Reporter:	IBM Bug Proxy <bugproxy>
Component:	libvirt	Assignee:	Daniel Veillard <veillard>
Status:	CLOSED WONTFIX	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.0	CC:	aliguori, berrange, hbrock, jjarvis, xen-maint
Target Milestone:	beta	Keywords:	FutureFeature
Target Release:	6.1
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-10-27 16:55:51 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:
Bug Blocks:	538808, 580566

Description IBM Bug Proxy 2009-08-19 17:21:09 UTC

=Comment: #0=================================================
Emily J. Ratliff <ratliff.com> - 
1. Feature Overview:
Feature Id:	[202017]
a. Name of Feature:	libvirt control of ksm
b. Feature Description
Add support to libvirt to control and query ksm levels on the host

2. Feature Details:
Sponsor:	LTC
Architectures:
x86
x86_64

Arch Specificity: Both
Delivery Mechanism: Direct from community
Category:	Xen
Request Type:	Package - Feature from Upstream
d. Upstream Acceptance:	In Progress
Sponsor Priority	2
f. Severity: Medium
IBM Confidential:	no
Code Contribution:	3rd party code
g. Component Version Target:	latest version of libvirt

3. Business Case
KSM is an important memory compression technology for KVM that provides for greater VM density on a
given KVM host.  Extending control of KSM to libvirt provies management applications the ability to
control KSM as needed, adjusting to customer workload demands.

4. Primary contact at Red Hat: 
John Jarvis
jjarvis

5. Primary contacts at Partner:
Project Management Contact:
Stephanie Glass, sglass.com, 512-838-9284

Technical contact(s):
Ryan Harper, raharper.com

IBM Manager:
Warren Grunbok II, grunbok.com

Comment 2 Daniel Berrangé 2009-09-17 12:08:45 UTC

The Fedora 12  KVM rpm includes a script for automatically tuning KSM parameters on the fly.

http://www.redhat.com/archives/fedora-virt/2009-September/msg00052.html

Need to evaluate what level of additional manual control might be needed in libvirt itself, if any.

Comment 3 Daniel Veillard 2009-09-21 13:02:34 UTC

Right now there is no specific KSM libvirt support upstream, though there
have been some discussions of memory overcommit control. But there is
nothing available upstream at this point so the feature is at risk for
RHEL 6.0 GA

Daniel

Comment 4 Hugh Brock 2009-12-21 17:17:59 UTC

We are not sure KSM management belongs in libvirt at all. In any case, it is clear that it needs to settle a while longer before we can understand what kind of API it should have.

Comment 6 Hugh Brock 2010-01-21 22:12:53 UTC

Deferred this to 6.1 -- we have not yet defined where the correct interface point is for gray-area services like KSM. Once we have done that it will be obvious whether it should have a libvirt API or the API should fall to some other service.

Comment 7 John Jarvis 2010-01-21 22:16:13 UTC

Removing from 6.0 tracker, adding to 6.1 tracker

Comment 8 IBM Bug Proxy 2010-10-27 16:51:09 UTC

------- Comment From aliguori.com 2010-10-27 12:43 EDT-------
Given the current interfaces provided by KSM, we no longer feel it's necessary to have a libvirt interface to manage KSM.

Comment 9 Daniel Veillard 2010-10-27 16:55:51 UTC

Okidoc,

  thanks !

Daniel

Comment 10 IBM Bug Proxy 2011-03-04 15:32:05 UTC

------- Comment From mcintire.com 2011-03-04 10:24 EDT-------
IBM is quiting this feature request.