Messages in this thread | | | Subject | Re: [PATCH 03/10] mm/migrate: update node demotion order during on hotplug events | From | David Hildenbrand <> | Date | Fri, 9 Apr 2021 20:59:21 +0200 |
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On 09.04.21 12:14, Oscar Salvador wrote: > On Thu, Apr 08, 2021 at 11:52:51AM +0200, Oscar Salvador wrote: >> I am not really into PMEM, and I ignore whether we need >> CONFIG_MEMORY_HOTPLUG in order to have such memory on the system. >> If so, the following can be partly ignored. > > Ok, I refreshed by memory with [1]. > From that, it seems that in order to use PMEM as RAM we need CONFIG_MEMORY_HOTPLUG. > But is that always the case? Can happen that in some scenario PMEM comes ready > to use and we do not need the hotplug trick?
The only way to add more System RAM is via add_memory() and friends like add_memory_driver_managed(). These all require CONFIG_MEMORY_HOTPLUG.
Memory ballooning is a different case, but there we're only adjusting the managed page counters.
-- Thanks,
David / dhildenb
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