Subject: [merged] mm-compaction-disallow-high-order-page-for-migration-target.patch removed from -mm tree
To: iamjoonsoo.kim@xxxxxxx,mgorman@xxxxxxx,riel@xxxxxxxxxx,vbabka@xxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 08 Apr 2014 13:35:23 -0700
The patch titled
Subject: mm/compaction: disallow high-order page for migration target
has been removed from the -mm tree. Its filename was
mm-compaction-disallow-high-order-page-for-migration-target.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Subject: mm/compaction: disallow high-order page for migration target
Purpose of compaction is to get a high order page. Currently, if we find
high-order page while searching migration target page, we break it to
order-0 pages and use them as migration target. It is contrary to purpose
of compaction, so disallow high-order page to be used for migration
target.
Additionally, clean-up logic in suitable_migration_target() to simplify
the code. There is no functional changes from this clean-up.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)
diff -puN mm/compaction.c~mm-compaction-disallow-high-order-page-for-migration-target mm/compaction.c
--- a/mm/compaction.c~mm-compaction-disallow-high-order-page-for-migration-target
+++ a/mm/compaction.c
@@ -217,21 +217,12 @@ static inline bool compact_trylock_irqsa
/* Returns true if the page is within a block suitable for migration to */
static bool suitable_migration_target(struct page *page)
{
- int migratetype = get_pageblock_migratetype(page);
-
- /* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
- if (migratetype == MIGRATE_RESERVE)
- return false;
-
- if (is_migrate_isolate(migratetype))
- return false;
-
- /* If the page is a large free page, then allow migration */
+ /* If the page is a large free page, then disallow migration */
if (PageBuddy(page) && page_order(page) >= pageblock_order)
- return true;
+ return false;
/* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
- if (migrate_async_suitable(migratetype))
+ if (migrate_async_suitable(get_pageblock_migratetype(page)))
return true;
/* Otherwise skip the block */
_
Patches currently in -mm which might be from iamjoonsoo.kim@xxxxxxx are
origin.patch
mm-compactionc-isolate_freepages_block-small-tuneup.patch
linux-next.patch
page-owners-correct-page-order-when-to-free-page.patch
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