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 today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-vivid ** Tags added: verification-needed-wily -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1542941 Title: Regression: problems migrating recent wily/vivid Xen VMs due to memory hotplug fix Status in linux package in Ubuntu: Triaged Status in linux source package in Vivid: Fix Committed Status in linux source package in Wily: Fix Committed Bug description: Commit 633d6f17cd91ad5bf2370265946f716e42d388c6 (aka 38d30afb12140c0e3a446fe779dc9cd29548f313 in vivid) in Xen domU causes high resource requirements in the underlying target dom0 (migrating a 64-bit domU involves a 1GB malloc in dom0, as well as a lot of unnecessary work). In my specific case, that 1GB malloc fails as my dom0s aren't big enough, causing all migrations to fail with the migrating VM suspended. This is fixed in http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=98dd166ea3a3c3b57919e20d9b0d1237fcd0349d : """ x86/xen/p2m: hint at the last populated P2M entry" With commit 633d6f17cd91ad5bf2370265946f716e42d388c6 (x86/xen: prepare p2m list for memory hotplug) the P2M may be sized to accomdate a much larger amount of memory than the domain currently has. When saving a domain, the toolstack must scan all the P2M looking for populated pages. This results in a performance regression due to the unnecessary scanning. Instead of reporting (via shared_info) the maximum possible size of the P2M, hint at the last PFN which might be populated. This hint is increased as new leaves are added to the P2M (in the expectation that they will be used for populated entries). Signed-off-by: David Vrabel <david.vra...@citrix.com> Cc: <sta...@vger.kernel.org> # 4.0+ """ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1542941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
