[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] repeating 'd1v0 Over-allocation for domain 1' messages in xen 4.7 Host logs on PVHVM Guest launch
Reading @ How to know if the balloon driver is running http://www.gossamer-threads.com/lists/xen/users/315064#315064 "... IIRC the core balloon driver is always present when Xen is enabled and so the kernel will respond to requests from the host/toolstack to change the amount of RAM (e.g "xm/xl mem-set foo" in dom0, which would result in changes to /proc/meminfo). In order to get in-guest access to control ballooning you need to CONFIG_XEN_BALLOON enable and load the xen-balloon.ko module. I'm not sure but I think with modern kernels this will appear in /sys and not /proc. ... AFAIK the balloon driver is started if you just have CONFIG_XEN.LIke I said before CONFIG_XEN_BALLOON enables additional support for controlling the balloon driver from within the guest (as opposed to from the host toolstack). ..." in the Guest, grep -i config_xen= /boot/*config* /boot/config-4.4.0-28-generic:CONFIG_XEN=y grep -i xen /boot/*config* | grep -i balloon /boot/config-4.4.0-28-generic:CONFIG_XEN_BALLOON=y /boot/config-4.4.0-28-generic:CONFIG_XEN_SELFBALLOONING=y /boot/config-4.4.0-28-generic:CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y /boot/config-4.4.0-28-generic:CONFIG_XEN_BALLOON_MEMORY_HOTPLUG_LIMIT=512 find /sys /proc -type d | grep -i balloon | grep xen /sys/devices/system/xen_memory/xen_memory0/selfballoon /proc/sys/xen/balloon ls -al /proc/sys/xen/balloon hotplug_unpopulated How do you blacklist the Guest ballooning? Perhaps related? Not clear 2 me that it's the same issue, xen/balloon: cancel ballooning if adding new memory failed https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3dcf63677d4eb7fdfc13290c8558c301d2588fe8 There's also balloon-related comments at http://wiki.xenproject.org/wiki/XenParavirtOps although they now look somewhat out of date w.r.t. current 4x kernel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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