linux-kernel - [PATCH 18/24] mm/list_lru.c: Remove kvfree_rcu

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Message-Id: <20200428205903.61704-19-urezki@gmail.com>
Date:   Tue, 28 Apr 2020 22:58:57 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Matthew Wilcox <willy@...radead.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        RCU <rcu@...r.kernel.org>, Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: [PATCH 18/24] mm/list_lru.c: Remove kvfree_rcu_local() function

Since there is newly introduced kvfree_rcu() API, there is no need in
queuing and using call_rcu() to kvfree() an object after the GP.

Remove kvfree_rcu_local() function and replace call_rcu() by new
kvfree_rcu() API that does the same but in more efficient way.

Cc: linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: rcu@...r.kernel.org
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 mm/list_lru.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/mm/list_lru.c b/mm/list_lru.c
index 42c95bcb53ca..a0b08b27a9b9 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -12,6 +12,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/memcontrol.h>
+#include <linux/rcupdate.h>
 #include "slab.h"
 
 #ifdef CONFIG_MEMCG_KMEM
@@ -373,21 +374,13 @@ static void memcg_destroy_list_lru_node(struct list_lru_node *nlru)
 	struct list_lru_memcg *memcg_lrus;
 	/*
 	 * This is called when shrinker has already been unregistered,
-	 * and nobody can use it. So, there is no need to use kvfree_rcu_local().
+	 * and nobody can use it. So, there is no need to use kvfree_rcu().
 	 */
 	memcg_lrus = rcu_dereference_protected(nlru->memcg_lrus, true);
 	__memcg_destroy_list_lru_node(memcg_lrus, 0, memcg_nr_cache_ids);
 	kvfree(memcg_lrus);
 }
 
-static void kvfree_rcu_local(struct rcu_head *head)
-{
-	struct list_lru_memcg *mlru;
-
-	mlru = container_of(head, struct list_lru_memcg, rcu);
-	kvfree(mlru);
-}
-
 static int memcg_update_list_lru_node(struct list_lru_node *nlru,
 				      int old_size, int new_size)
 {
@@ -419,7 +412,7 @@ static int memcg_update_list_lru_node(struct list_lru_node *nlru,
 	rcu_assign_pointer(nlru->memcg_lrus, new);
 	spin_unlock_irq(&nlru->lock);
 
-	call_rcu(&old->rcu, kvfree_rcu_local);
+	kvfree_rcu(old, rcu);
 	return 0;
 }
 
-- 
2.20.1