[RFC PATCH v4 27/40] mm: Update the freepage migratetype of pagesduring region allocation

[Srivatsa S. Bhat]

The freepage migratetype is used to determine which freelist a given
page should be added to, upon getting freed. To ensure that the page
goes to the right freelist, set the freepage migratetype of all
the pages of a region, when allocating freepages from the region allocator.

This helps ensure that upon freeing the pages or during buddy expansion,
the pages are added back to the freelists of the migratetype for which
the pages were originally requested from the region allocator.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
---

 mm/page_alloc.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0d73134..ca7b959 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1023,6 +1023,9 @@ static int del_from_region_allocator(struct zone *zone, unsigned int order,
 	reg_area = &reg_alloc->region[next_region].region_area[order];
 	ralloc_list = &reg_area->list;
 
+	list_for_each_entry(page, ralloc_list, lru)
+		set_freepage_migratetype(page, migratetype);
+
 	free_list = &zone->free_area[order].free_list[migratetype];
 
 	nr_pages = add_to_freelist_bulk(ralloc_list, free_list, order,

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