Red Hat Bugzilla – Bug 345271
[RHEL 5.2] Xen 3.1.1: Give memory back to dom0 after failed autoballoon
Last modified: 2014-02-02 17:36:22 EST
Cset 15328 from xen-3.1-testing.hg returns memory to dom0 if an autoballoon
attempt fails. It is recommended for inclusion in RHEL 5.2
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
This request was previously evaluated by Red Hat Product Management
for inclusion in the current Red Hat Enterprise Linux release, but
Red Hat was unable to resolve it in time. This request will be
reviewed for a future Red Hat Enterprise Linux release.
Created attachment 331572 [details]
Before ballooning memory and allocating new memory to a new domain it saves the current dom0 memory status and if autobaloon fails, it gives memory back to dom0 by restoring the memory size allocated to dom0.
It's backport of upstream at http://xenbits.xensource.com/xen-3.1-testing.hg?rev/73f18a202ea3 . Works fine for me, tested on RHEL x86_64.
A test package which fixes this issue (and several others as well) has been
made available at:
Could the reporter try it out and report if it fixes the problem or not?
Thank you for your cooperation.
Fix built into xen-3.0.3-81.el5
Could you please help give this bug test steps? Thanks.
(Because it is hard to make autoballoon fail)
(In reply to comment #7)
> Could you please help give this bug test steps? Thanks.
> (Because it is hard to make autoballoon fail)
You should be able to make autoballoon fail pretty easily by changing the dom0-min-mem parameter in /etc/xen/xend-config.sxp. So, assuming you have 4GB of memory, do something like:
And then try to start a 3GB guest; that should cause the auto-balloon to fail, and then you should be able to validate that this is fixed.
Verified on xen-3.0.3-91.el5 PASS
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
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if the solution does not work for you.