Commit 3777999d authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds

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

[ fix locking radce, per Vlastimil]
Signed-off-by: default avatarMel Gorman <>
Signed-off-by: default avatarVlastimil Babka <>
Cc: Vlastimil Babka <>
Cc: Jesper Dangaard Brouer <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 83d4ca81
......@@ -831,8 +831,10 @@ static void free_pcppages_bulk(struct zone *zone, int count,
int batch_free = 0;
int to_free = count;
unsigned long nr_scanned;
bool isolated_pageblocks;
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 zone *zone, int count,
/* 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);
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