The patch titled
Subject: mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix
has been added to the -mm tree. Its filename is
mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix.patch
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix
orders-fix
Clarify why __isolate_free_page() does a order-0 watermark check with
apparent (1UL << order) gap, per Joonsoo.
Link: http://lkml.kernel.org/r/7ae4baec-4eca-e70b-2a69-94bea4fb19fa@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN mm/page_alloc.c~mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix mm/page_alloc.c
--- a/mm/page_alloc.c~mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix
+++ a/mm/page_alloc.c
@@ -2489,7 +2489,12 @@ int __isolate_free_page(struct page *pag
mt = get_pageblock_migratetype(page);
if (!is_migrate_isolate(mt)) {
- /* Obey watermarks as if the page was being allocated */
+ /*
+ * Obey watermarks as if the page was being allocated. We can
+ * emulate a high-order watermark check with a raised order-0
+ * watermark, because we already know our high-order page
+ * exists.
+ */
watermark = min_wmark_pages(zone) + (1UL << order);
if (!zone_watermark_ok(zone, 0, watermark, 0, ALLOC_CMA))
return 0;
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-compaction-make-whole_zone-flag-ignore-cached-scanner-positions.patch
mm-compaction-cleanup-unused-functions.patch
mm-compaction-rename-compact_partial-to-compact_success.patch
mm-compaction-dont-recheck-watermarks-after-compact_success.patch
mm-compaction-add-the-ultimate-direct-compaction-priority.patch
mm-compaction-more-reliably-increase-direct-compaction-priority.patch
mm-compaction-use-correct-watermark-when-checking-compaction-success.patch
mm-compaction-create-compact_gap-wrapper.patch
mm-compaction-use-proper-alloc_flags-in-__compaction_suitable.patch
mm-compaction-require-only-min-watermarks-for-non-costly-orders.patch
mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix.patch
mm-vmscan-make-compaction_ready-more-accurate-and-readable.patch
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