linux-kernel - [PATCH] mm: migrate: drop redundant anonymous statistics for file folios migration

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Message-Id: <d5e191ae02c2ab63c70cdf44877fe14fc69f5ae8.1733368611.git.baolin.wang@linux.alibaba.com>
Date: Thu,  5 Dec 2024 11:53:48 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org
Cc: 21cnbao@...il.com,
	david@...hat.com,
	ying.huang@...ux.alibaba.com,
	ziy@...dia.com,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mm: migrate: drop redundant anonymous statistics for file folios migration

Commit 5d65c8d758f2 ("mm: count the number of anonymous THPs per size") adds
a new anonymous counter per THP size, however, when folio_mapping() is not NULL
during folio migration, it means this is not an anonymous folio, so remove the
redundant anonymous statistics in this case.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/migrate.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index e9e00d1d1d19..d7fdfdd23fd0 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -523,8 +523,6 @@ static int __folio_migrate_mapping(struct address_space *mapping,
 	 */
 	newfolio->index = folio->index;
 	newfolio->mapping = folio->mapping;
-	if (folio_test_anon(folio) && folio_test_large(folio))
-		mod_mthp_stat(folio_order(folio), MTHP_STAT_NR_ANON, 1);
 	folio_ref_add(newfolio, nr); /* add cache reference */
 	if (folio_test_swapbacked(folio)) {
 		__folio_set_swapbacked(newfolio);
-- 
2.39.3