No need to recompute in case the zone is already marked contiguous.
We will soon exploit this on the memory removal path, where we will only
clear zone->contiguous on zones that intersect with the memory to be
removed.
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Michal Hocko <mho...@suse.com>
Cc: Vlastimil Babka <vba...@suse.cz>
Cc: Oscar Salvador <osalva...@suse.de>
Cc: Pavel Tatashin <pavel.tatas...@microsoft.com>
Cc: Mel Gorman <mgor...@techsingularity.net>
Cc: Mike Rapoport <r...@linux.ibm.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Alexander Duyck <alexander.h.du...@linux.intel.com>
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
mm/page_alloc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5b799e11fba3..995708e05cde 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1546,6 +1546,9 @@ void set_zone_contiguous(struct zone *zone)
unsigned long block_start_pfn = zone->zone_start_pfn;
unsigned long block_end_pfn;
+ if (zone->contiguous)
+ return;
+
block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages);
for (; block_start_pfn < zone_end_pfn(zone);
block_start_pfn = block_end_pfn,
--
2.21.0
