Since commit efe771c7603b ("mm, compaction: always finish scanning of a
full pageblock"), compaction will always finish scanning a pageblock. And
migrate_pfn is assured to align with pageblock_nr_pages when we reach here.
So we will always return COMPACT_SUCCESS if a suitable fallback is found
due to the below IS_ALIGNED check of migrate_pfn. Simplify the code to make
this clear and improve the readability. No functional change intended.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/compaction.c | 29 ++++++++---------------------
1 file changed, 8 insertions(+), 21 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 334a573485fe..609a76d7e051 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2134,29 +2134,16 @@ static enum compact_result __compact_finished(struct compact_control *cc)
* other migratetype buddy lists.
*/
if (find_suitable_fallback(area, order, migratetype,
- true, &can_steal) != -1) {
-
- /* movable pages are OK in any pageblock */
- if (migratetype == MIGRATE_MOVABLE)
- return COMPACT_SUCCESS;
-
+ true, &can_steal) != -1)
/*
- * We are stealing for a non-movable allocation. Make
- * sure we finish compacting the current pageblock
- * first so it is as free as possible and we won't
- * have to steal another one soon. This only applies
- * to sync compaction, as async compaction operates
- * on pageblocks of the same migratetype.
+ * Movable pages are OK in any pageblock. If we are
+ * stealing for a non-movable allocation, make sure
+ * we finish compacting the current pageblock first
+ * (which is assured by the above migrate_pfn align
+ * check) so it is as free as possible and we won't
+ * have to steal another one soon.
*/
- if (cc->mode == MIGRATE_ASYNC ||
- IS_ALIGNED(cc->migrate_pfn,
- pageblock_nr_pages)) {
- return COMPACT_SUCCESS;
- }
-
- ret = COMPACT_CONTINUE;
- break;
- }
+ return COMPACT_SUCCESS;
}
out:
--
2.23.0
