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Date: Mon, 29 Jan 2024 20:36:48 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Nhat Pham <nphamcs@...il.com>,
Yosry Ahmed <yosryahmed@...gle.com>,
Chengming Zhou <zhouchengming@...edance.com>,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 12/20] mm: zswap: function ordering: zswap_pools
Move the operations against the global zswap_pools list (current pool,
last, find) to the pool section.
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
mm/zswap.c | 150 ++++++++++++++++++++++++++---------------------------
1 file changed, 73 insertions(+), 77 deletions(-)
diff --git a/mm/zswap.c b/mm/zswap.c
index 33775f2224b7..168afd6767b3 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -517,6 +517,79 @@ static void zswap_pool_put(struct zswap_pool *pool)
kref_put(&pool->kref, __zswap_pool_empty);
}
+static struct zswap_pool *__zswap_pool_current(void)
+{
+ struct zswap_pool *pool;
+
+ pool = list_first_or_null_rcu(&zswap_pools, typeof(*pool), list);
+ WARN_ONCE(!pool && zswap_has_pool,
+ "%s: no page storage pool!\n", __func__);
+
+ return pool;
+}
+
+static struct zswap_pool *zswap_pool_current(void)
+{
+ assert_spin_locked(&zswap_pools_lock);
+
+ return __zswap_pool_current();
+}
+
+static struct zswap_pool *zswap_pool_current_get(void)
+{
+ struct zswap_pool *pool;
+
+ rcu_read_lock();
+
+ pool = __zswap_pool_current();
+ if (!zswap_pool_get(pool))
+ pool = NULL;
+
+ rcu_read_unlock();
+
+ return pool;
+}
+
+static struct zswap_pool *zswap_pool_last_get(void)
+{
+ struct zswap_pool *pool, *last = NULL;
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(pool, &zswap_pools, list)
+ last = pool;
+ WARN_ONCE(!last && zswap_has_pool,
+ "%s: no page storage pool!\n", __func__);
+ if (!zswap_pool_get(last))
+ last = NULL;
+
+ rcu_read_unlock();
+
+ return last;
+}
+
+/* type and compressor must be null-terminated */
+static struct zswap_pool *zswap_pool_find_get(char *type, char *compressor)
+{
+ struct zswap_pool *pool;
+
+ assert_spin_locked(&zswap_pools_lock);
+
+ list_for_each_entry_rcu(pool, &zswap_pools, list) {
+ if (strcmp(pool->tfm_name, compressor))
+ continue;
+ /* all zpools share the same type */
+ if (strcmp(zpool_get_type(pool->zpools[0]), type))
+ continue;
+ /* if we can't get it, it's about to be destroyed */
+ if (!zswap_pool_get(pool))
+ continue;
+ return pool;
+ }
+
+ return NULL;
+}
+
/* should be called under RCU */
#ifdef CONFIG_MEMCG
static inline struct mem_cgroup *mem_cgroup_from_entry(struct zswap_entry *entry)
@@ -938,83 +1011,6 @@ static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
return 0;
}
-/*********************************
-* pool functions
-**********************************/
-
-static struct zswap_pool *__zswap_pool_current(void)
-{
- struct zswap_pool *pool;
-
- pool = list_first_or_null_rcu(&zswap_pools, typeof(*pool), list);
- WARN_ONCE(!pool && zswap_has_pool,
- "%s: no page storage pool!\n", __func__);
-
- return pool;
-}
-
-static struct zswap_pool *zswap_pool_current(void)
-{
- assert_spin_locked(&zswap_pools_lock);
-
- return __zswap_pool_current();
-}
-
-static struct zswap_pool *zswap_pool_current_get(void)
-{
- struct zswap_pool *pool;
-
- rcu_read_lock();
-
- pool = __zswap_pool_current();
- if (!zswap_pool_get(pool))
- pool = NULL;
-
- rcu_read_unlock();
-
- return pool;
-}
-
-static struct zswap_pool *zswap_pool_last_get(void)
-{
- struct zswap_pool *pool, *last = NULL;
-
- rcu_read_lock();
-
- list_for_each_entry_rcu(pool, &zswap_pools, list)
- last = pool;
- WARN_ONCE(!last && zswap_has_pool,
- "%s: no page storage pool!\n", __func__);
- if (!zswap_pool_get(last))
- last = NULL;
-
- rcu_read_unlock();
-
- return last;
-}
-
-/* type and compressor must be null-terminated */
-static struct zswap_pool *zswap_pool_find_get(char *type, char *compressor)
-{
- struct zswap_pool *pool;
-
- assert_spin_locked(&zswap_pools_lock);
-
- list_for_each_entry_rcu(pool, &zswap_pools, list) {
- if (strcmp(pool->tfm_name, compressor))
- continue;
- /* all zpools share the same type */
- if (strcmp(zpool_get_type(pool->zpools[0]), type))
- continue;
- /* if we can't get it, it's about to be destroyed */
- if (!zswap_pool_get(pool))
- continue;
- return pool;
- }
-
- return NULL;
-}
-
static enum lru_status shrink_memcg_cb(struct list_head *item, struct list_lru_one *l,
spinlock_t *lock, void *arg)
{
--
2.43.0
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