linux-kernel - [PATCH v6 03/10] mm: rename slab delayed deactivation functions and fields

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Date:   Tue, 4 Jun 2019 19:44:47 -0700
From:   Roman Gushchin <guro@...com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>, Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Waiman Long <longman@...hat.com>, Roman Gushchin <guro@...com>
Subject: [PATCH v6 03/10] mm: rename slab delayed deactivation functions and fields

The delayed work/rcu deactivation infrastructure of non-root
kmem_caches can be also used for asynchronous release of these
objects. Let's get rid of the word "deactivation" in corresponding
names to make the code look better after generalization.

It's easier to make the renaming first, so that the generalized
code will look consistent from scratch.

Let's rename struct memcg_cache_params fields:
  deact_fn -> work_fn
  deact_rcu_head -> rcu_head
  deact_work -> work

And RCU/delayed work callbacks in slab common code:
  kmemcg_deactivate_rcufn -> kmemcg_rcufn
  kmemcg_deactivate_workfn -> kmemcg_workfn

This patch contains no functional changes, only renamings.

Signed-off-by: Roman Gushchin <guro@...com>
---
 include/linux/slab.h |  6 +++---
 mm/slab.h            |  2 +-
 mm/slab_common.c     | 30 +++++++++++++++---------------
 3 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 9449b19c5f10..47923c173f30 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -642,10 +642,10 @@ struct memcg_cache_params {
 			struct list_head children_node;
 			struct list_head kmem_caches_node;
 
-			void (*deact_fn)(struct kmem_cache *);
+			void (*work_fn)(struct kmem_cache *);
 			union {
-				struct rcu_head deact_rcu_head;
-				struct work_struct deact_work;
+				struct rcu_head rcu_head;
+				struct work_struct work;
 			};
 		};
 	};
diff --git a/mm/slab.h b/mm/slab.h
index c16e5af0fb59..8ff90f42548a 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -292,7 +292,7 @@ static __always_inline void memcg_uncharge_slab(struct page *page, int order,
 extern void slab_init_memcg_params(struct kmem_cache *);
 extern void memcg_link_cache(struct kmem_cache *s, struct mem_cgroup *memcg);
 extern void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
-				void (*deact_fn)(struct kmem_cache *));
+				void (*work_fn)(struct kmem_cache *));
 
 #else /* CONFIG_MEMCG_KMEM */
 
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 77df6029de8e..d019ee66bdc4 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -692,17 +692,17 @@ void memcg_create_kmem_cache(struct mem_cgroup *memcg,
 	put_online_cpus();
 }
 
-static void kmemcg_deactivate_workfn(struct work_struct *work)
+static void kmemcg_workfn(struct work_struct *work)
 {
 	struct kmem_cache *s = container_of(work, struct kmem_cache,
-					    memcg_params.deact_work);
+					    memcg_params.work);
 
 	get_online_cpus();
 	get_online_mems();
 
 	mutex_lock(&slab_mutex);
 
-	s->memcg_params.deact_fn(s);
+	s->memcg_params.work_fn(s);
 
 	mutex_unlock(&slab_mutex);
 
@@ -713,36 +713,36 @@ static void kmemcg_deactivate_workfn(struct work_struct *work)
 	css_put(&s->memcg_params.memcg->css);
 }
 
-static void kmemcg_deactivate_rcufn(struct rcu_head *head)
+static void kmemcg_rcufn(struct rcu_head *head)
 {
 	struct kmem_cache *s = container_of(head, struct kmem_cache,
-					    memcg_params.deact_rcu_head);
+					    memcg_params.rcu_head);
 
 	/*
-	 * We need to grab blocking locks.  Bounce to ->deact_work.  The
+	 * We need to grab blocking locks.  Bounce to ->work.  The
 	 * work item shares the space with the RCU head and can't be
 	 * initialized eariler.
 	 */
-	INIT_WORK(&s->memcg_params.deact_work, kmemcg_deactivate_workfn);
-	queue_work(memcg_kmem_cache_wq, &s->memcg_params.deact_work);
+	INIT_WORK(&s->memcg_params.work, kmemcg_workfn);
+	queue_work(memcg_kmem_cache_wq, &s->memcg_params.work);
 }
 
 /**
  * slab_deactivate_memcg_cache_rcu_sched - schedule deactivation after a
  *					   sched RCU grace period
  * @s: target kmem_cache
- * @deact_fn: deactivation function to call
+ * @work_fn: deactivation function to call
  *
- * Schedule @deact_fn to be invoked with online cpus, mems and slab_mutex
+ * Schedule @work_fn to be invoked with online cpus, mems and slab_mutex
  * held after a sched RCU grace period.  The slab is guaranteed to stay
- * alive until @deact_fn is finished.  This is to be used from
+ * alive until @work_fn is finished.  This is to be used from
  * __kmemcg_cache_deactivate().
  */
 void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
-					   void (*deact_fn)(struct kmem_cache *))
+					   void (*work_fn)(struct kmem_cache *))
 {
 	if (WARN_ON_ONCE(is_root_cache(s)) ||
-	    WARN_ON_ONCE(s->memcg_params.deact_fn))
+	    WARN_ON_ONCE(s->memcg_params.work_fn))
 		return;
 
 	if (s->memcg_params.root_cache->memcg_params.dying)
@@ -751,8 +751,8 @@ void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
 	/* pin memcg so that @s doesn't get destroyed in the middle */
 	css_get(&s->memcg_params.memcg->css);
 
-	s->memcg_params.deact_fn = deact_fn;
-	call_rcu(&s->memcg_params.deact_rcu_head, kmemcg_deactivate_rcufn);
+	s->memcg_params.work_fn = work_fn;
+	call_rcu(&s->memcg_params.rcu_head, kmemcg_rcufn);
 }
 
 void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg)
-- 
2.20.1