Re: [PATCH 09/10] memory-hotplug: enable memory hotplug to handlehugepage

From: Naoya Horiguchi
Date: Tue Apr 09 2013 - 22:26:07 EST

On Tue, Apr 09, 2013 at 09:56:58PM -0400, KOSAKI Motohiro wrote:
> On Tue, Apr 9, 2013 at 6:43 PM, Naoya Horiguchi
> > MIGRATE_ISOLTE is changed only within the range [start_pfn, end_pfn)
> > given as the argument of __offline_pages (see also start_isolate_page_range),
> > so it's set only for pages within the single memblock to be offlined.
> When partial memory hot remove, that's correct behavior. different
> node is not required.
> > BTW, in previous discussion I already agreed with checking migrate type
> > in hugepage allocation code (maybe it will be in dequeue_huge_page_vma(),)
> > so what you concern should be solved in the next post.
> Umm.. Maybe I missed such discussion. Do you have a pointer?

Please see the bottom of the following:
It's not exactly the same, but we need to prevent the allocation
from the memblock under hotremoving not only to be efficient,
but also to avoid the race.

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