[PATCH RFC 08/37] mm: compaction: Account for free metadata pages in __compact_finished()

Alexandru Elisei
2023-08-23T13:15:02Z

__compact_finished() signals the end of compaction if a page of an order
greater than or equal to the requested order if found on a free_area.
When allocation of MIGRATE_METADATA pages is allowed, count the number
of free metadata storage pages towards the request order.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
mm/compaction.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index dbc9f86b1934..f132c02b0655 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2208,6 +2208,13 @@ static enum compact_result __compact_finished(struct compact_control *cc)
if (migratetype == MIGRATE_MOVABLE &&
!free_area_empty(area, MIGRATE_CMA))
return COMPACT_SUCCESS;
+#endif
+#ifdef CONFIG_MEMORY_METADATA
+ if (metadata_storage_enabled() &&
+ migratetype == MIGRATE_MOVABLE &&
+ (cc->alloc_flags & ALLOC_FROM_METADATA) &&
+ !free_area_empty(area, MIGRATE_METADATA))
+ return COMPACT_SUCCESS;
#endif
/*
* Job done if allocation would steal freepages from
--
2.41.0