linux-kernel - [PATCH 1/2] mm/khugepaged: Introduce release_pte_folio() to replace release_pte

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Message-Id: <20230114001556.43795-1-vishal.moola@gmail.com>
Date:   Fri, 13 Jan 2023 16:15:55 -0800
From:   "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH 1/2] mm/khugepaged: Introduce release_pte_folio() to replace release_pte_page()

release_pte_page() is converted to be a wrapper for release_pte_folio()
to help facilitate the khugepaged conversion to folios.

This replaces 3 calls to compound_head() with 1, and saves 85 bytes of
kernel text.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
 mm/khugepaged.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index e1c7c1f357ef..4888e8688401 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -492,13 +492,18 @@ void __khugepaged_exit(struct mm_struct *mm)
 	}
 }
 
+static void release_pte_folio(struct folio *folio)
+{
+	node_stat_mod_folio(folio,
+			NR_ISOLATED_ANON + folio_is_file_lru(folio),
+			-folio_nr_pages(folio));
+	folio_unlock(folio);
+	folio_putback_lru(folio);
+}
+
 static void release_pte_page(struct page *page)
 {
-	mod_node_page_state(page_pgdat(page),
-			NR_ISOLATED_ANON + page_is_file_lru(page),
-			-compound_nr(page));
-	unlock_page(page);
-	putback_lru_page(page);
+	release_pte_folio(page_folio(page));
 }
 
 static void release_pte_pages(pte_t *pte, pte_t *_pte,
-- 
2.38.1