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authorMel Gorman <mgorman@techsingularity.net>2016-05-19 17:13:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 19:12:14 -0700
commit3777999dd47ec00ec34a151b1d93c0a2b721e822 (patch)
tree1c64a296774ffc929bf71ab7aab9023379f406dd /mm
parent83d4ca8148fd9092715fd8ef75b30bbfd67fd2a9 (diff)
downloadop-kernel-dev-3777999dd47ec00ec34a151b1d93c0a2b721e822.zip
op-kernel-dev-3777999dd47ec00ec34a151b1d93c0a2b721e822.tar.gz
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@techsingularity.net: fix locking radce, per Vlastimil] Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 48afc1a..a3b7eb8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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;
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 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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