Re: [PATCH 6/8] s390/mm: implement MEM_PHYS_ONLINE MEM_PHYS_OFFLINE memory notifiers

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Maybe s390x should just provide a dedicate interface to add these memory
blocks instead of adding them during boot and then relying on the old way of
using online/offline set them online/offline.

Existing behavior:
The current 'lsmem -a' command displays both online and standby memory.

interface changes:
If a new interface is introduced and standby memory is no longer listed,
the following consequences might occur:

1. Running 'lsmem -a' would only show online memory, potentially leading
     to user complaints.

That's why the new, clean way of doing it will require a world switch.
If the admin wants the benefits of altmap/memmap allocation, it can be

BTW, thinking about it, I guess one could teach lsmem (and maybe chmem) to consult additional interfaces on s390x to show standby memory that's not added to the system yet.


David / dhildenb

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