The patch titled
thp: transhuge isolate_migratepages()
has been removed from the -mm tree. Its filename was
thp-transhuge-isolate_migratepages.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: thp: transhuge isolate_migratepages()
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
It's not worth migrating transparent hugepages during compaction. Those
hugepages don't create fragmentation.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff -puN mm/compaction.c~thp-transhuge-isolate_migratepages mm/compaction.c
--- a/mm/compaction.c~thp-transhuge-isolate_migratepages
+++ a/mm/compaction.c
@@ -295,10 +295,25 @@ static unsigned long isolate_migratepage
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);
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
origin.patch
thp-add-pagetranscompound.patch
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