Re: [PATCH 1/1] mm/memory_hotplug: Adds option to hot-add memory in ZONE_MOVABLE

[Pavel Tatashin]

> > Just trying to understand, if kernel parameters is the preferable
> > method, why do we even have
> >
> > MEMORY_HOTPLUG_DEFAULT_ONLINE
>
> I have some opinion on this one TBH. I have even tried to remove it. The
> config option has been added to workaround hotplug issues for some
> memory balloning usecases where it was believed that the memory consumed
> for the memory hotadd (struct pages) could get machine to OOM before
> userspace manages to online it. So I would be more than happy to remove
> it but there were some objections in the past. Maybe the work by Oscar
> to allocate memmaps from the hotplugged memory can finally put an end to
> this gross hack.

Makes sense, thank you for the background info.

Pasha