linux-kernel - [PATCH v3 2/3] hugetlb: memcg: account hugetlb-backed memory in memory controller (fix)

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Date:   Wed,  4 Oct 2023 12:45:06 -0700
From:   Nhat Pham <nphamcs@...il.com>
To:     akpm@...ux-foundation.org
Cc:     riel@...riel.com, hannes@...xchg.org, mhocko@...nel.org,
        roman.gushchin@...ux.dev, shakeelb@...gle.com,
        muchun.song@...ux.dev, tj@...nel.org, lizefan.x@...edance.com,
        shuah@...nel.org, mike.kravetz@...cle.com, yosryahmed@...gle.com,
        fvdl@...gle.com, linux-mm@...ck.org, kernel-team@...a.com,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: [PATCH v3 2/3] hugetlb: memcg: account hugetlb-backed memory in memory controller (fix)

Ensure hugetlb folio migration also transfers the memcg metadata.

This fixlet should be squashed to the following patch:
https://lore.kernel.org/lkml/20231003001828.2554080-3-nphamcs@gmail.com/
hugetlb: memcg: account hugetlb-backed memory in memory controller

Suggested-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Nhat Pham <nphamcs@...il.com>
---
 mm/migrate.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 7d1804c4a5d9..6034c7ed1d65 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -633,8 +633,7 @@ void folio_migrate_flags(struct folio *newfolio, struct folio *folio)
 
 	folio_copy_owner(newfolio, folio);
 
-	if (!folio_test_hugetlb(folio))
-		mem_cgroup_migrate(folio, newfolio);
+	mem_cgroup_migrate(folio, newfolio);
 }
 EXPORT_SYMBOL(folio_migrate_flags);
 
-- 
2.34.1