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thp: transhuge isolate_migratepages()

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It's not worth migrating transparent hugepages during compaction.  Those
hugepages don't create fragmentation.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2011-01-13 15:47:08 -08:00 committed by Linus Torvalds
parent 5d6892407c
commit bc835011af
1 changed files with 15 additions and 0 deletions
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15
mm/compaction.c
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@ -295,10 +295,25 @@ static unsigned long isolate_migratepages(struct zone *zone,
continue;
}
if (!PageLRU(page))
continue;
/*
* PageLRU is set, and lru_lock excludes isolation,
* splitting and collapsing (collapsing has already
* happened if PageLRU is set).
*/
if (PageTransHuge(page)) {
low_pfn += (1 << compound_order(page)) - 1;
continue;
}
/* Try isolate the page */
if (__isolate_lru_page(page, ISOLATE_BOTH, 0) != 0)
continue;
VM_BUG_ON(PageTransCompound(page));
/* Successfully isolated */
del_page_from_lru_list(zone, page, page_lru(page));
list_add(&page->lru, migratelist);