** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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Title:
Memory balloning in Hyper-V generation 2 does
Fix released in 3.13.0-77.121
** Changed in: linux (Ubuntu Trusty)
Status: Fix Committed => Fix Released
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Title:
Memory
Tested it with the Trusty proposed kernel 3.13.0-75-generic, ballooning
works as expected, no issues detected.
** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty
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This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.
If verification is not done by 5 working days from
This bug was fixed in the package linux - 3.19.0-41.46
---
linux (3.19.0-41.46) vivid; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1522918
[ Upstream Kernel Changes ]
* Revert "dm: fix AB-BA deadlock in __dm_destroy()"
- LP: #1522766
* dm: fix
This bug was fixed in the package linux - 3.19.0-41.46
---
linux (3.19.0-41.46) vivid; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1522918
[ Upstream Kernel Changes ]
* Revert "dm: fix AB-BA deadlock in __dm_destroy()"
- LP: #1522766
* dm: fix
** Changed in: linux (Ubuntu Trusty)
Status: In Progress => Fix Committed
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Title:
Memory balloning in Hyper-V generation 2
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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Title:
Memory balloning in Hyper-V generation 2 does not
We tested the above test kernel on Trusty, works good, no errors found.
You can submit the request.
Thanks!
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Title:
Memory
I tested kernel in -proposed on Vivid, memory ballooning works.
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Title:
Memory balloning in Hyper-V generation 2 does not work
** Tags removed: verification-needed-vivid
** Tags added: verification-done-vivid
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Title:
Memory balloning in Hyper-V generation 2
I built a trusty test kernel, which can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1294283/trusty/
Can you test this kernel and see if it resolves this bug? If it does,
I'll submit the Trusty SRU request.
Thanks!
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We'll test the kernel in -proposed right away. Thanks!
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Title:
Memory balloning in Hyper-V generation 2 does not work
Status in
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'.
If verification is not done by 5 working days from
** Changed in: linux (Ubuntu Vivid)
Status: In Progress => Fix Committed
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Title:
Memory balloning in Hyper-V generation 2
** No longer affects: linux (Ubuntu Utopic)
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Title:
Memory balloning in Hyper-V generation 2 does not work
Status in linux package
I tested kernel from #53 on Vivid and everything was ok. You can commit
the changes on Vivid.
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Title:
Memory balloning in Hyper-V
I built a Vivid test kernel with the five commits I also mentioned in
comment #52. There were also some prerequisite commits required to get
the patches to apply to a 3.19 kernel. The following commits were
applied:
commit 530d15b
commit 0a1a86a
commit ba0c444
commit 797f88c
commit 4e4bd36
Wily has the following five commits now:
ba0c4441
797f88c9
4e4bd36f
7ace9917
e298ff75
Can Wily with the latest updates be tested to confirm it no longer
exhibits this bug?
** Changed in: linux (Ubuntu Wily)
Status: In Progress => Fix Released
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Looking at a different request, may be missing
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=797f88c987b02a8de8d4fac94ec2877b92ec35a2
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ba0c444153889a9b672974d85a4a57a8eeb49fe3
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I just wanted to check what patches we think are needed to resolve this
bug? I build a test kernel with a cherry pick of only commit 4e4bd36f.
However, it looks like there may be a total of three patches required:
commit 4e4bd36f
commit 7ace9917
commit e298ff75
Joshua or nmeier can you confirm
I have not reproduced this bug as I don't have and environment to do so.
Maybe Jan Henke, the original bug reporter, can confirm your question in
comment #42?
The Wily and Vivid test kernels I built only have the following commit
cherry-picked per comment #34:
commit
Sorry, I cannot comment on that matter. I do not have the setup to test
it any more.
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Title:
Memory balloning in Hyper-V generation
@Joshua do you mean me?
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Title:
Memory balloning in Hyper-V generation 2 does not work
Status in linux package in Ubuntu:
In
Do you need our assistance in setting up tests of this particular
function on Hyper-V?
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Title:
Memory balloning in Hyper-V
We're happy to help with the setup of a test case, and we can test
things on our systems as well.
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Title:
Memory balloning in
That still does not answer if you are asking me to test anything. I
probably do not have anything to add here, especially since I upgraded
the host system to Windows 10 in the mean time, any result would be
therefore not exactly comparable.
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Hi Joshua,
I found an evaluation copy of Hyper-V Server[0]. Do you happen to know
if the evaluation copy will limit what type of tests can be performed?
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Hi Joseph,
In Linux-next, we have seen an issue caused by memory not being onlined
after hot adding. This bug caused our guest to falsely report memory to
host as being assigned; even though it was actually inaccessible. We
wonder if this is what you’re seeing as well.
There were two relevant
Let's keep the terms clear here:
hot add raises the high water mark of available memory and will
increase the total memory seen by the Linux VM. Because there's no hot
remove (yet) free -m will increase with hot add but never decrease.
balloon will take memory and allocate it to buffers
Hot Add issues remain.
Memory is Hot Added as demand increases.
Memory is not ballooned down after demand is reduced.
syslog has numerous call traces for hung task.
Call stack shows calls to mem_hotplug_begin()
Tail end of syslog attached as syslog.log.
Test procedure:
- Create 15.04 VM.
-
So the ballooning up of memory is now working, but it is not ballooning
back down? Is this also the case with the Wily test kernel I posted in
comment #36 or is that test kernel find and this is only happening with
my Vivid test kernel?
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Thanks for testing. I sent an request for inclusion of this commit in
Wily.
I built a Vivid test kernel with a cherry-pick of commit
4e4bd36f97b1492f19b3329ac74ed313da13de34
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1294283/vivid
Can you test this kernel
I was able to use this test kernel and run our memory stress test
application on it. I was able to balloon it up from its startup memory
to 3.5GB. Looks like the test kernel works okay. No errors on our stress
tests, no unexpected messages in the syslog.
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** Changed in: linux (Ubuntu)
Assignee: (unassigned) = Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu)
Status: Confirmed = In Progress
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** Also affects: linux (Ubuntu Wily)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: In Progress
** Also affects: linux (Ubuntu Vivid)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
I built a Wily test kernel with a cherry-pick of commit
4e4bd36f97b1492f19b3329ac74ed313da13de34
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1294283/
Can you test this kernel and see if it resolves this bug?
Thanks in advance!
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Consider adding patch https://github.com/alexngmsft/lis-
next/commit/87e03a0943bb9e0760fcf2fe980908a68422a87c
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Title:
Memory
Upstream original commit id: 4e4bd36f97b1492f19b3329ac74ed313da13de34
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Title:
Memory balloning in Hyper-V generation 2 does not
Ballooning works. Hot Add has issues.
The original issue as reported has been resolved.
Initially, memory is successfully hot added to the VM. As demand
continues to increase,
no additional memory is hot added. Eventually a hung task message is
logged in syslog.
The call trace shows
This should be verified to work for 14.04.
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Title:
Memory balloning in Hyper-V generation 2 does not work
Status in linux package
As a way to validate if equivalent patches have been submitted, the Linux-Next
kernel from April 15, 2015 was built and installed on a 14.10 Gen 2 VM. After
rebooting into the Linux-Next kernel (version 4.0.0-next-20150415), ballooning
worked.
Tested dynamic memory configuration:
Minimum
Bug 1292400 references an email from KY which describes a patch to
mm/memory_hotplug.c. KY confirmed the patch in the referenced email was
not submitted, but equivalent patches have been submitted.
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I believe this is another occurance of the issue in bug #1292400.
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Title:
Memory balloning in Hyper-V generation 2 does not work
apport information
** Description changed:
The generation 2 VM has been assinged a memory range of 512 MiB-4096MiB
with a starting memory of 512 MiB. It should get additional memory when
needed, but the total available memory in the VM stays at the intial 512
MiB and the kernel starts
The problem just reappeared after the latest kernel upgrade. Apport data
is attached.
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Title:
Memory balloning in Hyper-V
apport information
** Tags added: apport-collected
** Description changed:
The generation 2 VM has been assinged a memory range of 512 MiB-4096MiB
with a starting memory of 512 MiB. It should get additional memory when
needed, but the total available memory in the VM stays at the intial
After some time the problem reappeared again today. Ballooning worked at
first and the VM got more than the initial memory, but after some time
this double kernel stack traces were back.
The time these end in the kernel log is just determined by the time I
uploaded the kernel log, from my
** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
** Tags added: kernel-hyper-v
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Title:
Memory balloning in Hyper-V
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