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Re: [Xen-devel] [PATCH RFC] mm/memory_hotplug: Introduce memory block types

On Thu, 4 Oct 2018 17:45:13 +0200
David Hildenbrand <david@xxxxxxxxxx> wrote:

> On 04/10/2018 17:28, Michal Suchánek wrote:

> > 
> > The state of the art is to determine what to do with hotplugged
> > memory in userspace based on platform and virtualization type.  
> Exactly.
> > 
> > Changing the default to depend on the driver that added the memory
> > rather than platform type should solve the issue of VMs growing
> > different types of memory device emulation.  
> Yes, my original proposal (this patch) was to handle it in the kernel
> for known types. But as we learned, there might be some use cases that
> might still require to make a decision in user space.
> So providing the user space either with some type hint (auto-online
> vs. standby) or the driver that added it (system vs. hyper-v ...)
> would solve the issue.

Is that not available in the udev event?



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