On Sun, Mar 15, 2020 at 07:18:40PM +0100, Uladzislau Rezki (Sony) wrote:
> 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.
This patch LGTM:
Reviewed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
thanks,
- Joel
>
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
> ---
> 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 386424688f80..69becdb22408 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
> @@ -383,21 +384,13 @@ 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)
> {
> @@ -429,7 +422,7 @@ 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
>
