From: Joonsoo Kim Date: Mon, 7 Apr 2014 22:37:04 +0000 (-0700) Subject: mm/compaction: do not call suitable_migration_target() on every page X-Git-Tag: v3.14.21~15 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e292d9ad60b820e49a6825a501461df7f527b8d8;p=thirdparty%2Fkernel%2Fstable.git mm/compaction: do not call suitable_migration_target() on every page commit 01ead5340bcf5f3a1cd2452c75516d0ef4d908d7 upstream. suitable_migration_target() checks that pageblock is suitable for migration target. In isolate_freepages_block(), it is called on every page and this is inefficient. So make it called once per pageblock. suitable_migration_target() also checks if page is highorder or not, but it's criteria for highorder is pageblock order. So calling it once within pageblock range has no problem. Signed-off-by: Joonsoo Kim Acked-by: Vlastimil Babka Cc: Mel Gorman Cc: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Mel Gorman Signed-off-by: Greg Kroah-Hartman --- diff --git a/mm/compaction.c b/mm/compaction.c index fcb05da931ffc..711ebf75b454c 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -244,6 +244,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc, struct page *cursor, *valid_page = NULL; unsigned long flags; bool locked = false; + bool checked_pageblock = false; cursor = pfn_to_page(blockpfn); @@ -275,8 +276,16 @@ static unsigned long isolate_freepages_block(struct compact_control *cc, break; /* Recheck this is a suitable migration target under lock */ - if (!strict && !suitable_migration_target(page)) - break; + if (!strict && !checked_pageblock) { + /* + * We need to check suitability of pageblock only once + * and this isolate_freepages_block() is called with + * pageblock range, so just check once is sufficient. + */ + checked_pageblock = true; + if (!suitable_migration_target(page)) + break; + } /* Recheck this is a buddy page under lock */ if (!PageBuddy(page))