linux-kernel - [PATCH 2/2] mm: zpool: return pool size in pages

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Date: Mon, 11 Mar 2024 12:12:14 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Yosry Ahmed <yosryahmed@...gle.com>,
	Nhat Pham <nphamcs@...il.com>,
	Chengming Zhou <zhouchengming@...edance.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] mm: zpool: return pool size in pages

All zswap backends track their pool sizes in pages. Currently they
multiply by PAGE_SIZE for zswap, only for zswap to divide again in
order to do limit math. Report pages directly.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/z3fold.c   | 2 +-
 mm/zbud.c     | 2 +-
 mm/zpool.c    | 4 ++--
 mm/zsmalloc.c | 2 +-
 mm/zswap.c    | 4 ++--
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/z3fold.c b/mm/z3fold.c
index 7ab05621052d..9bacacd4168c 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -1404,7 +1404,7 @@ static void z3fold_zpool_unmap(void *pool, unsigned long handle)
 
 static u64 z3fold_zpool_total_size(void *pool)
 {
-	return z3fold_get_pool_size(pool) * PAGE_SIZE;
+	return z3fold_get_pool_size(pool);
 }
 
 static struct zpool_driver z3fold_zpool_driver = {
diff --git a/mm/zbud.c b/mm/zbud.c
index 2190cc1f37b3..b7d8a22bbf5f 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -412,7 +412,7 @@ static void zbud_zpool_unmap(void *pool, unsigned long handle)
 
 static u64 zbud_zpool_total_size(void *pool)
 {
-	return zbud_get_pool_size(pool) * PAGE_SIZE;
+	return zbud_get_pool_size(pool);
 }
 
 static struct zpool_driver zbud_zpool_driver = {
diff --git a/mm/zpool.c b/mm/zpool.c
index 846410479c2f..410808aee7fe 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -324,9 +324,9 @@ void zpool_unmap_handle(struct zpool *zpool, unsigned long handle)
  * zpool_get_total_size() - The total size of the pool
  * @zpool:	The zpool to check
  *
- * This returns the total size in bytes of the pool.
+ * This returns the total size in pages of the pool.
  *
- * Returns: Total size of the zpool in bytes.
+ * Returns: Total size of the zpool in pages.
  */
 u64 zpool_get_total_size(struct zpool *zpool)
 {
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 7d7cb3eaabe0..398f3856817f 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -401,7 +401,7 @@ static void zs_zpool_unmap(void *pool, unsigned long handle)
 
 static u64 zs_zpool_total_size(void *pool)
 {
-	return zs_get_total_pages(pool) << PAGE_SHIFT;
+	return zs_get_total_pages(pool);
 }
 
 static struct zpool_driver zs_zpool_driver = {
diff --git a/mm/zswap.c b/mm/zswap.c
index 7c39327a7cc2..fe4343e416e0 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -507,7 +507,7 @@ static unsigned long zswap_max_pages(void)
 unsigned long zswap_total_pages(void)
 {
 	struct zswap_pool *pool;
-	u64 total = 0;
+	unsigned long total = 0;
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(pool, &zswap_pools, list) {
@@ -518,7 +518,7 @@ unsigned long zswap_total_pages(void)
 	}
 	rcu_read_unlock();
 
-	return total >> PAGE_SHIFT;
+	return total;
 }
 
 /*********************************
-- 
2.44.0