Re: [PATCH 17/18] dax: Assign RAM regions to memory-hotplug by default

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Gregory Price wrote:
> On Sun, Feb 05, 2023 at 05:04:05PM -0800, Dan Williams wrote:
[..]
> 
> Stupid question: when defaulting to online, do these devices get placed
> into Zone Normal?  Is there a way for us, at a minimum, to online this
> as Zone Moveable in an effort to assist the "hope the kernel has not
> pinned a page" problem (and to try to keep kernel resources out of this
> zone in general).
> 
> If this is covered by a different patch or already set up this way,
> ignore me :]

Have a look in Documentation/admin-guide/mm/memory-hotplug.rst, the
'daxctl recconfigure-device' man page and the the policy options of how
hot-added memory is brought online.

The routing can be anything from fully offline device-dax, to fully
online ZONE_NORMAL, or even a mix of device-dax subdivision,
ZONE_NORMAL, and ZONE_MOVABLE memblocks all within one CXL ram region.




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