The patch titled
Subject: mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks-fix-2
has been removed from the -mm tree. Its filename was
mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks-fix-2.patch
This patch was dropped because it was folded into mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks.patch
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Subject: mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks-fix-2
Fix can_rescue_unmovable_pageblock() comment and __count_immobile_pages()
documentation.
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx>
Cc: Dave Jones <davej@xxxxxxxxxx>
Cc: Cong Wang <amwang@xxxxxxxxxx>
Cc: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 9 +++++----
mm/page_alloc.c | 16 +++++++++++-----
2 files changed, 16 insertions(+), 9 deletions(-)
diff -puN mm/compaction.c~mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks-fix-2 mm/compaction.c
--- a/mm/compaction.c~mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks-fix-2
+++ a/mm/compaction.c
@@ -377,10 +377,11 @@ static bool can_rescue_unmovable_pageblo
start_page = pfn_to_page(start_pfn);
/*
- * Race with page allocator/reclaimer can happen so that it can
- * deceive unmovable block to migratable type on this pageblock.
- * It could regress on anti-fragmentation but it's rare and not
- * critical.
+ * Race with page allocator/reclaimer can happen so it is possible
+ * that MIGRATE_UNMOVABLE type page will end up in MIGRATE_MOVABLE
+ * type pageblock. However such situation is rare and not critical
+ * (because page allocator fallback mechanism can also allocate
+ * MIGRATE_UNMOVABLE type pages in MIGRATE_MOVABLE type pageblock).
*/
return __count_immobile_pages(zone, start_page, 0);
}
diff -puN mm/page_alloc.c~mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks-fix-2 mm/page_alloc.c
--- a/mm/page_alloc.c~mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks-fix-2
+++ a/mm/page_alloc.c
@@ -5465,12 +5465,18 @@ void set_pageblock_flags_group(struct pa
__clear_bit(bitidx + start_bitidx, bitmap);
}
-/*
- * This is designed as sub function...plz see page_isolation.c also.
- * set/clear page block's type to be ISOLATE.
- * page allocater never alloc memory from ISOLATE block.
+/**
+ * __count_immobile_pages - Check pageblock for MIGRATE_UNMOVABLE type pages.
+ * @zone: Zone pages are in.
+ * @page: The first page in the pageblock.
+ * @count: The count of allowed MIGRATE_UNMOVABLE type pages.
+ *
+ * Count the number of MIGRATE_UNMOVABLE type pages in the pageblock
+ * starting with @page. Returns true If the @zone is of ZONE_MOVABLE
+ * type or the pageblock is of MIGRATE_MOVABLE or MIGRATE_CMA type.
+ * If the number of MIGRATE_UNMOVABLE type pages inside the pageblock
+ * is higher than given by @count returns false, true otherwise.
*/
-
bool __count_immobile_pages(struct zone *zone, struct page *page, int count)
{
unsigned long pfn, iter, found;
_
Patches currently in -mm which might be from b.zolnierkie@xxxxxxxxxxx are
mm-compaction-handle-incorrect-migrate_unmovable-type-pageblocks.patch
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