Messages in this thread Patch in this message | | | From | David Hildenbrand <> | Subject | [PATCH v3 08/11] mm: Exit early in set_zone_contiguous() if already contiguous | Date | Thu, 29 Aug 2019 09:00:16 +0200 |
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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 <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Oscar Salvador <osalvador@suse.de> Cc: Pavel Tatashin <pavel.tatashin@microsoft.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com> Signed-off-by: David Hildenbrand <david@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 44038665fe8e..a9935dc19f5b 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
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