[PATCH 3/8] mm: memcontrol: give the kmem states more descriptive names

[Johannes Weiner]

On any given memcg, the kmem accounting feature has three separate
states: not initialized, structures allocated, and actively accounting
slab memory. These are represented through a combination of the
kmem_acct_activated and kmem_acct_active flags, which is confusing.

Convert to a kmem_state enum with the states NONE, ALLOCATED, and
ONLINE. Then rename the functions to modify the state accordingly.
This follows the nomenclature of css object states more closely.

Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 include/linux/memcontrol.h | 15 ++++++++-----
 mm/memcontrol.c            | 52 ++++++++++++++++++++++------------------------
 mm/slab_common.c           |  4 ++--
 mm/vmscan.c                |  2 +-
 4 files changed, 38 insertions(+), 35 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 189f04d..54dab4d 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -152,6 +152,12 @@ struct mem_cgroup_thresholds {
 	struct mem_cgroup_threshold_ary *spare;
 };
 
+enum memcg_kmem_state {
+	KMEM_NONE,
+	KMEM_ALLOCATED,
+	KMEM_ONLINE,
+};
+
 /*
  * The memory controller data structure. The memory controller controls both
  * page cache and RSS per cgroup. We would eventually like to provide
@@ -233,8 +239,7 @@ struct mem_cgroup {
 #if defined(CONFIG_MEMCG_KMEM)
         /* Index in the kmem_cache->memcg_params.memcg_caches array */
 	int kmemcg_id;
-	bool kmem_acct_activated;
-	bool kmem_acct_active;
+	enum memcg_kmem_state kmem_state;
 #endif
 
 	int last_scanned_node;
@@ -750,9 +755,9 @@ static inline bool memcg_kmem_enabled(void)
 	return static_branch_unlikely(&memcg_kmem_enabled_key);
 }
 
-static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
+static inline bool memcg_kmem_online(struct mem_cgroup *memcg)
 {
-	return memcg->kmem_acct_active;
+	return memcg->kmem_state == KMEM_ONLINE;
 }
 
 /*
@@ -850,7 +855,7 @@ static inline bool memcg_kmem_enabled(void)
 	return false;
 }
 
-static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
+static inline bool memcg_kmem_online(struct mem_cgroup *memcg)
 {
 	return false;
 }
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 02167db..22b8c4f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2357,7 +2357,7 @@ int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
 	struct page_counter *counter;
 	int ret;
 
-	if (!memcg_kmem_is_active(memcg))
+	if (!memcg_kmem_online(memcg))
 		return 0;
 
 	if (!page_counter_try_charge(&memcg->kmem, nr_pages, &counter))
@@ -2840,14 +2840,13 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css,
 }
 
 #ifdef CONFIG_MEMCG_KMEM
-static int memcg_activate_kmem(struct mem_cgroup *memcg)
+static int memcg_online_kmem(struct mem_cgroup *memcg)
 {
 	int err = 0;
 	int memcg_id;
 
 	BUG_ON(memcg->kmemcg_id >= 0);
-	BUG_ON(memcg->kmem_acct_activated);
-	BUG_ON(memcg->kmem_acct_active);
+	BUG_ON(memcg->kmem_state);
 
 	/*
 	 * For simplicity, we won't allow this to be disabled.  It also can't
@@ -2877,14 +2876,13 @@ static int memcg_activate_kmem(struct mem_cgroup *memcg)
 
 	static_branch_inc(&memcg_kmem_enabled_key);
 	/*
-	 * A memory cgroup is considered kmem-active as soon as it gets
+	 * A memory cgroup is considered kmem-online as soon as it gets
 	 * kmemcg_id. Setting the id after enabling static branching will
 	 * guarantee no one starts accounting before all call sites are
 	 * patched.
 	 */
 	memcg->kmemcg_id = memcg_id;
-	memcg->kmem_acct_activated = true;
-	memcg->kmem_acct_active = true;
+	memcg->kmem_state = KMEM_ONLINE;
 out:
 	return err;
 }
@@ -2896,8 +2894,8 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
 
 	mutex_lock(&memcg_limit_mutex);
 	/* Top-level cgroup doesn't propagate from root */
-	if (!memcg_kmem_is_active(memcg)) {
-		ret = memcg_activate_kmem(memcg);
+	if (!memcg_kmem_online(memcg)) {
+		ret = memcg_online_kmem(memcg);
 		if (ret)
 			goto out;
 	}
@@ -2917,11 +2915,12 @@ static int memcg_propagate_kmem(struct mem_cgroup *memcg)
 
 	mutex_lock(&memcg_limit_mutex);
 	/*
-	 * If the parent cgroup is not kmem-active now, it cannot be activated
-	 * after this point, because it has at least one child already.
+	 * If the parent cgroup is not kmem-online now, it cannot be
+	 * onlined after this point, because it has at least one child
+	 * already.
 	 */
-	if (memcg_kmem_is_active(parent))
-		ret = memcg_activate_kmem(memcg);
+	if (memcg_kmem_online(parent))
+		ret = memcg_online_kmem(memcg);
 	mutex_unlock(&memcg_limit_mutex);
 	return ret;
 }
@@ -3568,22 +3567,21 @@ static int memcg_init_kmem(struct mem_cgroup *memcg)
 	return tcp_init_cgroup(memcg);
 }
 
-static void memcg_deactivate_kmem(struct mem_cgroup *memcg)
+static void memcg_offline_kmem(struct mem_cgroup *memcg)
 {
 	struct cgroup_subsys_state *css;
 	struct mem_cgroup *parent, *child;
 	int kmemcg_id;
 
-	if (!memcg->kmem_acct_active)
+	if (memcg->kmem_state != KMEM_ONLINE)
 		return;
-
 	/*
-	 * Clear the 'active' flag before clearing memcg_caches arrays entries.
-	 * Since we take the slab_mutex in memcg_deactivate_kmem_caches(), it
-	 * guarantees no cache will be created for this cgroup after we are
-	 * done (see memcg_create_kmem_cache()).
+	 * Clear the online state before clearing memcg_caches array
+	 * entries. The slab_mutex in memcg_deactivate_kmem_caches()
+	 * guarantees that no cache will be created for this cgroup
+	 * after we are done (see memcg_create_kmem_cache()).
 	 */
-	memcg->kmem_acct_active = false;
+	memcg->kmem_state = KMEM_ALLOCATED;
 
 	memcg_deactivate_kmem_caches(memcg);
 
@@ -3614,9 +3612,9 @@ static void memcg_deactivate_kmem(struct mem_cgroup *memcg)
 	memcg_free_cache_id(kmemcg_id);
 }
 
-static void memcg_destroy_kmem(struct mem_cgroup *memcg)
+static void memcg_free_kmem(struct mem_cgroup *memcg)
 {
-	if (memcg->kmem_acct_activated) {
+	if (memcg->kmem_state == KMEM_ALLOCATED) {
 		memcg_destroy_kmem_caches(memcg);
 		static_branch_dec(&memcg_kmem_enabled_key);
 		WARN_ON(page_counter_read(&memcg->kmem));
@@ -3629,11 +3627,11 @@ static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
 	return 0;
 }
 
-static void memcg_deactivate_kmem(struct mem_cgroup *memcg)
+static void memcg_offline_kmem(struct mem_cgroup *memcg)
 {
 }
 
-static void memcg_destroy_kmem(struct mem_cgroup *memcg)
+static void memcg_free_kmem(struct mem_cgroup *memcg)
 {
 }
 #endif
@@ -4286,7 +4284,7 @@ static void mem_cgroup_css_offline(struct cgroup_subsys_state *css)
 
 	vmpressure_cleanup(&memcg->vmpressure);
 
-	memcg_deactivate_kmem(memcg);
+	memcg_offline_kmem(memcg);
 
 	wb_memcg_offline(memcg);
 }
@@ -4295,7 +4293,7 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_css(css);
 
-	memcg_destroy_kmem(memcg);
+	memcg_free_kmem(memcg);
 #ifdef CONFIG_INET
 	if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket)
 		static_branch_dec(&memcg_sockets_enabled_key);
diff --git a/mm/slab_common.c b/mm/slab_common.c
index e016178..8c262e6 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -503,10 +503,10 @@ void memcg_create_kmem_cache(struct mem_cgroup *memcg,
 	mutex_lock(&slab_mutex);
 
 	/*
-	 * The memory cgroup could have been deactivated while the cache
+	 * The memory cgroup could have been offlined while the cache
 	 * creation work was pending.
 	 */
-	if (!memcg_kmem_is_active(memcg))
+	if (!memcg_kmem_online(memcg))
 		goto out_unlock;
 
 	idx = memcg_cache_id(memcg);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 50e54c0..2dbc679 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -411,7 +411,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
 	struct shrinker *shrinker;
 	unsigned long freed = 0;
 
-	if (memcg && !memcg_kmem_is_active(memcg))
+	if (memcg && !memcg_kmem_online(memcg))
 		return 0;
 
 	if (nr_scanned == 0)
-- 
2.6.3

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