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Date: Mon, 29 Jan 2024 20:36:46 -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 10/20] mm: zswap: function ordering: pool alloc & free
The function ordering in zswap.c is a little chaotic, which requires
jumping in unexpected directions when following related code. This is
a series of patches that brings the file into the following order:
- pool functions
- lru functions
- rbtree functions
- zswap entry functions
- compression/backend functions
- writeback & shrinking functions
- store, load, invalidate, swapon, swapoff
- debugfs
- init
But it has to be split up such the moving still produces halfway
readable diffs.
In this patch, move pool allocation and freeing functions.
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
mm/zswap.c | 297 +++++++++++++++++++++++++++--------------------------
1 file changed, 152 insertions(+), 145 deletions(-)
diff --git a/mm/zswap.c b/mm/zswap.c
index 082d076a758d..805d9a35f633 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -320,6 +320,158 @@ static void zswap_update_total_size(void)
zswap_pool_total_size = total;
}
+/*********************************
+* pool functions
+**********************************/
+
+static void zswap_alloc_shrinker(struct zswap_pool *pool);
+static void shrink_worker(struct work_struct *w);
+
+static struct zswap_pool *zswap_pool_create(char *type, char *compressor)
+{
+ int i;
+ struct zswap_pool *pool;
+ char name[38]; /* 'zswap' + 32 char (max) num + \0 */
+ gfp_t gfp = __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM;
+ int ret;
+
+ if (!zswap_has_pool) {
+ /* if either are unset, pool initialization failed, and we
+ * need both params to be set correctly before trying to
+ * create a pool.
+ */
+ if (!strcmp(type, ZSWAP_PARAM_UNSET))
+ return NULL;
+ if (!strcmp(compressor, ZSWAP_PARAM_UNSET))
+ return NULL;
+ }
+
+ pool = kzalloc(sizeof(*pool), GFP_KERNEL);
+ if (!pool)
+ return NULL;
+
+ for (i = 0; i < ZSWAP_NR_ZPOOLS; i++) {
+ /* unique name for each pool specifically required by zsmalloc */
+ snprintf(name, 38, "zswap%x",
+ atomic_inc_return(&zswap_pools_count));
+
+ pool->zpools[i] = zpool_create_pool(type, name, gfp);
+ if (!pool->zpools[i]) {
+ pr_err("%s zpool not available\n", type);
+ goto error;
+ }
+ }
+ pr_debug("using %s zpool\n", zpool_get_type(pool->zpools[0]));
+
+ strscpy(pool->tfm_name, compressor, sizeof(pool->tfm_name));
+
+ pool->acomp_ctx = alloc_percpu(*pool->acomp_ctx);
+ if (!pool->acomp_ctx) {
+ pr_err("percpu alloc failed\n");
+ goto error;
+ }
+
+ ret = cpuhp_state_add_instance(CPUHP_MM_ZSWP_POOL_PREPARE,
+ &pool->node);
+ if (ret)
+ goto error;
+
+ zswap_alloc_shrinker(pool);
+ if (!pool->shrinker)
+ goto error;
+
+ pr_debug("using %s compressor\n", pool->tfm_name);
+
+ /* being the current pool takes 1 ref; this func expects the
+ * caller to always add the new pool as the current pool
+ */
+ kref_init(&pool->kref);
+ INIT_LIST_HEAD(&pool->list);
+ if (list_lru_init_memcg(&pool->list_lru, pool->shrinker))
+ goto lru_fail;
+ shrinker_register(pool->shrinker);
+ INIT_WORK(&pool->shrink_work, shrink_worker);
+ atomic_set(&pool->nr_stored, 0);
+
+ zswap_pool_debug("created", pool);
+
+ return pool;
+
+lru_fail:
+ list_lru_destroy(&pool->list_lru);
+ shrinker_free(pool->shrinker);
+error:
+ if (pool->acomp_ctx)
+ free_percpu(pool->acomp_ctx);
+ while (i--)
+ zpool_destroy_pool(pool->zpools[i]);
+ kfree(pool);
+ return NULL;
+}
+
+static struct zswap_pool *__zswap_pool_create_fallback(void)
+{
+ bool has_comp, has_zpool;
+
+ has_comp = crypto_has_acomp(zswap_compressor, 0, 0);
+ if (!has_comp && strcmp(zswap_compressor,
+ CONFIG_ZSWAP_COMPRESSOR_DEFAULT)) {
+ pr_err("compressor %s not available, using default %s\n",
+ zswap_compressor, CONFIG_ZSWAP_COMPRESSOR_DEFAULT);
+ param_free_charp(&zswap_compressor);
+ zswap_compressor = CONFIG_ZSWAP_COMPRESSOR_DEFAULT;
+ has_comp = crypto_has_acomp(zswap_compressor, 0, 0);
+ }
+ if (!has_comp) {
+ pr_err("default compressor %s not available\n",
+ zswap_compressor);
+ param_free_charp(&zswap_compressor);
+ zswap_compressor = ZSWAP_PARAM_UNSET;
+ }
+
+ has_zpool = zpool_has_pool(zswap_zpool_type);
+ if (!has_zpool && strcmp(zswap_zpool_type,
+ CONFIG_ZSWAP_ZPOOL_DEFAULT)) {
+ pr_err("zpool %s not available, using default %s\n",
+ zswap_zpool_type, CONFIG_ZSWAP_ZPOOL_DEFAULT);
+ param_free_charp(&zswap_zpool_type);
+ zswap_zpool_type = CONFIG_ZSWAP_ZPOOL_DEFAULT;
+ has_zpool = zpool_has_pool(zswap_zpool_type);
+ }
+ if (!has_zpool) {
+ pr_err("default zpool %s not available\n",
+ zswap_zpool_type);
+ param_free_charp(&zswap_zpool_type);
+ zswap_zpool_type = ZSWAP_PARAM_UNSET;
+ }
+
+ if (!has_comp || !has_zpool)
+ return NULL;
+
+ return zswap_pool_create(zswap_zpool_type, zswap_compressor);
+}
+
+static void zswap_pool_destroy(struct zswap_pool *pool)
+{
+ int i;
+
+ zswap_pool_debug("destroying", pool);
+
+ shrinker_free(pool->shrinker);
+ cpuhp_state_remove_instance(CPUHP_MM_ZSWP_POOL_PREPARE, &pool->node);
+ free_percpu(pool->acomp_ctx);
+ list_lru_destroy(&pool->list_lru);
+
+ spin_lock(&zswap_pools_lock);
+ mem_cgroup_iter_break(NULL, pool->next_shrink);
+ pool->next_shrink = NULL;
+ spin_unlock(&zswap_pools_lock);
+
+ for (i = 0; i < ZSWAP_NR_ZPOOLS; i++)
+ zpool_destroy_pool(pool->zpools[i]);
+ kfree(pool);
+}
+
/* should be called under RCU */
#ifdef CONFIG_MEMCG
static inline struct mem_cgroup *mem_cgroup_from_entry(struct zswap_entry *entry)
@@ -970,151 +1122,6 @@ static void shrink_worker(struct work_struct *w)
zswap_pool_put(pool);
}
-static struct zswap_pool *zswap_pool_create(char *type, char *compressor)
-{
- int i;
- struct zswap_pool *pool;
- char name[38]; /* 'zswap' + 32 char (max) num + \0 */
- gfp_t gfp = __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM;
- int ret;
-
- if (!zswap_has_pool) {
- /* if either are unset, pool initialization failed, and we
- * need both params to be set correctly before trying to
- * create a pool.
- */
- if (!strcmp(type, ZSWAP_PARAM_UNSET))
- return NULL;
- if (!strcmp(compressor, ZSWAP_PARAM_UNSET))
- return NULL;
- }
-
- pool = kzalloc(sizeof(*pool), GFP_KERNEL);
- if (!pool)
- return NULL;
-
- for (i = 0; i < ZSWAP_NR_ZPOOLS; i++) {
- /* unique name for each pool specifically required by zsmalloc */
- snprintf(name, 38, "zswap%x",
- atomic_inc_return(&zswap_pools_count));
-
- pool->zpools[i] = zpool_create_pool(type, name, gfp);
- if (!pool->zpools[i]) {
- pr_err("%s zpool not available\n", type);
- goto error;
- }
- }
- pr_debug("using %s zpool\n", zpool_get_type(pool->zpools[0]));
-
- strscpy(pool->tfm_name, compressor, sizeof(pool->tfm_name));
-
- pool->acomp_ctx = alloc_percpu(*pool->acomp_ctx);
- if (!pool->acomp_ctx) {
- pr_err("percpu alloc failed\n");
- goto error;
- }
-
- ret = cpuhp_state_add_instance(CPUHP_MM_ZSWP_POOL_PREPARE,
- &pool->node);
- if (ret)
- goto error;
-
- zswap_alloc_shrinker(pool);
- if (!pool->shrinker)
- goto error;
-
- pr_debug("using %s compressor\n", pool->tfm_name);
-
- /* being the current pool takes 1 ref; this func expects the
- * caller to always add the new pool as the current pool
- */
- kref_init(&pool->kref);
- INIT_LIST_HEAD(&pool->list);
- if (list_lru_init_memcg(&pool->list_lru, pool->shrinker))
- goto lru_fail;
- shrinker_register(pool->shrinker);
- INIT_WORK(&pool->shrink_work, shrink_worker);
- atomic_set(&pool->nr_stored, 0);
-
- zswap_pool_debug("created", pool);
-
- return pool;
-
-lru_fail:
- list_lru_destroy(&pool->list_lru);
- shrinker_free(pool->shrinker);
-error:
- if (pool->acomp_ctx)
- free_percpu(pool->acomp_ctx);
- while (i--)
- zpool_destroy_pool(pool->zpools[i]);
- kfree(pool);
- return NULL;
-}
-
-static struct zswap_pool *__zswap_pool_create_fallback(void)
-{
- bool has_comp, has_zpool;
-
- has_comp = crypto_has_acomp(zswap_compressor, 0, 0);
- if (!has_comp && strcmp(zswap_compressor,
- CONFIG_ZSWAP_COMPRESSOR_DEFAULT)) {
- pr_err("compressor %s not available, using default %s\n",
- zswap_compressor, CONFIG_ZSWAP_COMPRESSOR_DEFAULT);
- param_free_charp(&zswap_compressor);
- zswap_compressor = CONFIG_ZSWAP_COMPRESSOR_DEFAULT;
- has_comp = crypto_has_acomp(zswap_compressor, 0, 0);
- }
- if (!has_comp) {
- pr_err("default compressor %s not available\n",
- zswap_compressor);
- param_free_charp(&zswap_compressor);
- zswap_compressor = ZSWAP_PARAM_UNSET;
- }
-
- has_zpool = zpool_has_pool(zswap_zpool_type);
- if (!has_zpool && strcmp(zswap_zpool_type,
- CONFIG_ZSWAP_ZPOOL_DEFAULT)) {
- pr_err("zpool %s not available, using default %s\n",
- zswap_zpool_type, CONFIG_ZSWAP_ZPOOL_DEFAULT);
- param_free_charp(&zswap_zpool_type);
- zswap_zpool_type = CONFIG_ZSWAP_ZPOOL_DEFAULT;
- has_zpool = zpool_has_pool(zswap_zpool_type);
- }
- if (!has_zpool) {
- pr_err("default zpool %s not available\n",
- zswap_zpool_type);
- param_free_charp(&zswap_zpool_type);
- zswap_zpool_type = ZSWAP_PARAM_UNSET;
- }
-
- if (!has_comp || !has_zpool)
- return NULL;
-
- return zswap_pool_create(zswap_zpool_type, zswap_compressor);
-}
-
-static void zswap_pool_destroy(struct zswap_pool *pool)
-{
- int i;
-
- zswap_pool_debug("destroying", pool);
-
- shrinker_free(pool->shrinker);
- cpuhp_state_remove_instance(CPUHP_MM_ZSWP_POOL_PREPARE, &pool->node);
- free_percpu(pool->acomp_ctx);
- list_lru_destroy(&pool->list_lru);
-
- spin_lock(&zswap_pools_lock);
- mem_cgroup_iter_break(NULL, pool->next_shrink);
- pool->next_shrink = NULL;
- spin_unlock(&zswap_pools_lock);
-
- for (i = 0; i < ZSWAP_NR_ZPOOLS; i++)
- zpool_destroy_pool(pool->zpools[i]);
- kfree(pool);
-}
-
static int __must_check zswap_pool_get(struct zswap_pool *pool)
{
if (!pool)
--
2.43.0
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