The patch titled
Subject: mm, page_alloc: check once if a zone has isolated pageblocks
has been removed from the -mm tree. Its filename was
mm-page_alloc-check-once-if-a-zone-has-isolated-pageblocks.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm, page_alloc: check once if a zone has isolated pageblocks
When bulk freeing pages from the per-cpu lists the zone is checked for
isolated pageblocks on every release. This patch checks it once per
drain.
[mgorman@xxxxxxxxxxxxxxxxxxx: fix locking radce, per Vlastimil]
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN mm/page_alloc.c~mm-page_alloc-check-once-if-a-zone-has-isolated-pageblocks mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-check-once-if-a-zone-has-isolated-pageblocks
+++ a/mm/page_alloc.c
@@ -831,8 +831,10 @@ static void free_pcppages_bulk(struct zo
int batch_free = 0;
int to_free = count;
unsigned long nr_scanned;
+ bool isolated_pageblocks;
spin_lock(&zone->lock);
+ isolated_pageblocks = has_isolate_pageblock(zone);
nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
if (nr_scanned)
__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
@@ -870,7 +872,7 @@ static void free_pcppages_bulk(struct zo
/* MIGRATE_ISOLATE page should not go to pcplists */
VM_BUG_ON_PAGE(is_migrate_isolate(mt), page);
/* Pageblock could have been isolated meanwhile */
- if (unlikely(has_isolate_pageblock(zone)))
+ if (unlikely(isolated_pageblocks))
mt = get_pageblock_migratetype(page);
__free_one_page(page, page_to_pfn(page), zone, 0, mt);
_
Patches currently in -mm which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
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