On Mon, 5 Nov 2007, Mel Gorman wrote:

quoted text
> The grow_dev_page() pages should be reclaimable even though migration
> is not supported for those pages? They were marked movable as it was
> useful for lumpy reclaim taking back pages for hugepage allocations and
> the like. Would it make sense for memory unremove to attempt migration
> first and reclaim second?

Note that a page is still movable even if there is no file system method 
for migration available. In that case the page needs to be cleaned before 
it can be moved.

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