Messages in this thread Patch in this message | | | Date | Wed, 14 Aug 2013 12:45:41 +0800 | From | Xishi Qiu <> | Subject | [PATCH] mm: skip the page buddy block instead of one page |
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A large free page buddy block will continue many times, so if the page is free, skip the whole page buddy block instead of one page.
Signed-off-by: Xishi Qiu <qiuxishi@huawei.com> --- mm/compaction.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c index 05ccb4c..874bae1 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -520,9 +520,10 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, goto next_pageblock; /* Skip if free */ - if (PageBuddy(page)) + if (PageBuddy(page)) { + low_pfn += (1 << page_order(page)) - 1; continue; - + } /* * For async migration, also only scan in MOVABLE blocks. Async * migration is optimistic to see if the minimum amount of work -- 1.7.1
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