linux-kernel - [PATCH RFC 08/37] mm: compaction: Account for free metadata pages in __compact

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Date:   Wed, 23 Aug 2023 14:13:21 +0100
From:   Alexandru Elisei <alexandru.elisei@....com>
To:     catalin.marinas@....com, will@...nel.org, oliver.upton@...ux.dev,
        maz@...nel.org, james.morse@....com, suzuki.poulose@....com,
        yuzenghui@...wei.com, arnd@...db.de, akpm@...ux-foundation.org,
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Cc:     pcc@...gle.com, steven.price@....com, anshuman.khandual@....com,
        vincenzo.frascino@....com, david@...hat.com, eugenis@...gle.com,
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Subject: [PATCH RFC 08/37] mm: compaction: Account for free metadata pages in __compact_finished()

__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@....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