[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v5 1/2] memory-hotplug: add automatic onlining policy for the newly added memory
On Wed, Jan 13, 2016 at 06:32:29PM +0100, Vitaly Kuznetsov wrote: > Currently, all newly added memory blocks remain in 'offline' state unless > someone onlines them, some linux distributions carry special udev rules > like: > > SUBSYSTEM=="memory", ACTION=="add", ATTR{state}=="offline", > ATTR{state}="online" > > to make this happen automatically. This is not a great solution for virtual > machines where memory hotplug is being used to address high memory pressure > situations as such onlining is slow and a userspace process doing this > (udev) has a chance of being killed by the OOM killer as it will probably > require to allocate some memory. > > Introduce default policy for the newly added memory blocks in > /sys/devices/system/memory/auto_online_blocks file with two possible > values: "offline" which preserves the current behavior and "online" which > causes all newly added memory blocks to go online as soon as they're added. > The default is "offline". > > Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Reviewed-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx> Daniel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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