Re: [PATCH 18/24] mm/list_lru.c: Remove kvfree_rcu_local() function

[Uladzislau Rezki <urezki@gmail.com>]

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Hello.

I apologize. Please ignore this patch and email. Wanted to send it to one
person,
instead git send-email also handled some emails from commit footer.

--
Vlad Rezki

On Mon, Apr 27, 2020 at 1:11 PM Uladzislau Rezki (Sony) <urezki@gmail.com>
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.
>
> Cc: linux-mm@kvack.org
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: rcu@vger.kernel.org
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.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
>
>

-- 
Uladzislau Rezki

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