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mm: zswap: function ordering: zswap_pools

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Move the operations against the global zswap_pools list (current pool,
last, find) to the pool section.

Link: https://lkml.kernel.org/r/20240130014208.565554-13-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2024-01-29 20:36:48 -05:00 committed by Andrew Morton
parent 39f3ec8eaa
commit c1a0ecb82b
1 changed files with 73 additions and 77 deletions
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150
mm/zswap.c
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@ -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)
@ -937,83 +1010,6 @@ 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)
{