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@xxxxxxxxxx>
---
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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