Re: [v4 2/2] device-dax: "Hotremove" persistent memory that is used like normal RAM

[Sasha Levin]

On Wed, May 01, 2019 at 03:18:46PM -0400, Pavel Tatashin wrote:
> It is now allowed to use persistent memory like a regular RAM, but
> currently there is no way to remove this memory until machine is
> rebooted.
>
> This work expands the functionality to also allows hotremoving
> previously hotplugged persistent memory, and recover the device for use
> for other purposes.
>
> To hotremove persistent memory, the management software must first
> offline all memory blocks of dax region, and than unbind it from
> device-dax/kmem driver. So, operations should look like this:
>
> echo offline > echo offline > /sys/devices/system/memory/memoryN/state

This looks wrong :)

--
Thanks,
Sasha