linux-kernel - [PATCH v2 7/8] mm: swap: factor out helper to drop cache of entries within a single cluster

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Message-Id: <20250318150614.6415-8-shikemeng@huaweicloud.com>
Date: Tue, 18 Mar 2025 23:06:13 +0800
From: Kemeng Shi <shikemeng@...weicloud.com>
To: akpm@...ux-foundation.org
Cc: tim.c.chen@...ux.intel.com,
	ryncsn@...il.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 7/8] mm: swap: factor out helper to drop cache of entries within a single cluster

Factor out helper swap_entries_put_cache() from put_swap_folio() to server
as a general-purpose routine for dropping cache flag of entries within a
single cluster.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
Reviewed-by: Tim Chen <tim.c.chen@...ux.intel.com>
---
 mm/swapfile.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 370509eb2f1f..919daaa3922a 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1455,6 +1455,21 @@ struct swap_info_struct *get_swap_device(swp_entry_t entry)
 	return NULL;
 }
 
+static void swap_entries_put_cache(struct swap_info_struct *si,
+				   swp_entry_t entry, int nr)
+{
+	unsigned long offset = swp_offset(entry);
+	struct swap_cluster_info *ci;
+
+	ci = lock_cluster(si, offset);
+	if (swap_only_has_cache(si, offset, nr))
+		swap_entries_free(si, ci, entry, nr);
+	else
+		for (int i = 0; i < nr; i++, entry.val++)
+			swap_entry_put_locked(si, ci, entry, SWAP_HAS_CACHE);
+	unlock_cluster(ci);
+}
+
 static bool swap_entries_put_map(struct swap_info_struct *si,
 				 swp_entry_t entry, int nr)
 {
@@ -1588,8 +1603,6 @@ void swap_free_nr(swp_entry_t entry, int nr_pages)
  */
 void put_swap_folio(struct folio *folio, swp_entry_t entry)
 {
-	unsigned long offset = swp_offset(entry);
-	struct swap_cluster_info *ci;
 	struct swap_info_struct *si;
 	int size = 1 << swap_entry_order(folio_order(folio));
 
@@ -1597,13 +1610,7 @@ void put_swap_folio(struct folio *folio, swp_entry_t entry)
 	if (!si)
 		return;
 
-	ci = lock_cluster(si, offset);
-	if (swap_only_has_cache(si, offset, size))
-		swap_entries_free(si, ci, entry, size);
-	else
-		for (int i = 0; i < size; i++, entry.val++)
-			swap_entry_put_locked(si, ci, entry, SWAP_HAS_CACHE);
-	unlock_cluster(ci);
+	swap_entries_put_cache(si, entry, size);
 }
 
 int __swap_count(swp_entry_t entry)
-- 
2.30.0