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Date:   Wed, 5 Jun 2019 12:56:36 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Hui Zhu <teawaterz@...ux.alibaba.com>
Cc:     Dan Streetman <ddstreet@...e.org>,
        Minchan Kim <minchan@...nel.org>, ngupta@...are.org,
        sergey.senozhatsky.work@...il.com,
        Seth Jennings <sjenning@...hat.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 1/2] zpool: Add malloc_support_movable to zpool_driver

On Wed, Jun 5, 2019 at 3:06 AM Hui Zhu <teawaterz@...ux.alibaba.com> wrote:
>
> As a zpool_driver, zsmalloc can allocate movable memory because it
> support migate pages.
> But zbud and z3fold cannot allocate movable memory.
>
> This commit adds malloc_support_movable to zpool_driver.
> If a zpool_driver support allocate movable memory, set it to true.
> And add zpool_malloc_support_movable check malloc_support_movable
> to make sure if a zpool support allocate movable memory.
>
> Signed-off-by: Hui Zhu <teawaterz@...ux.alibaba.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>

IMHO no need to block this series on z3fold query.

> ---
>  include/linux/zpool.h |  3 +++
>  mm/zpool.c            | 16 ++++++++++++++++
>  mm/zsmalloc.c         | 19 ++++++++++---------
>  3 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/zpool.h b/include/linux/zpool.h
> index 7238865e75b0..51bf43076165 100644
> --- a/include/linux/zpool.h
> +++ b/include/linux/zpool.h
> @@ -46,6 +46,8 @@ const char *zpool_get_type(struct zpool *pool);
>
>  void zpool_destroy_pool(struct zpool *pool);
>
> +bool zpool_malloc_support_movable(struct zpool *pool);
> +
>  int zpool_malloc(struct zpool *pool, size_t size, gfp_t gfp,
>                         unsigned long *handle);
>
> @@ -90,6 +92,7 @@ struct zpool_driver {
>                         struct zpool *zpool);
>         void (*destroy)(void *pool);
>
> +       bool malloc_support_movable;
>         int (*malloc)(void *pool, size_t size, gfp_t gfp,
>                                 unsigned long *handle);
>         void (*free)(void *pool, unsigned long handle);
> diff --git a/mm/zpool.c b/mm/zpool.c
> index a2dd9107857d..863669212070 100644
> --- a/mm/zpool.c
> +++ b/mm/zpool.c
> @@ -238,6 +238,22 @@ const char *zpool_get_type(struct zpool *zpool)
>         return zpool->driver->type;
>  }
>
> +/**
> + * zpool_malloc_support_movable() - Check if the zpool support
> + * allocate movable memory
> + * @zpool:     The zpool to check
> + *
> + * This returns if the zpool support allocate movable memory.
> + *
> + * Implementations must guarantee this to be thread-safe.
> + *
> + * Returns: true if if the zpool support allocate movable memory, false if not
> + */
> +bool zpool_malloc_support_movable(struct zpool *zpool)
> +{
> +       return zpool->driver->malloc_support_movable;
> +}
> +
>  /**
>   * zpool_malloc() - Allocate memory
>   * @zpool:     The zpool to allocate from.
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 0787d33b80d8..8f3d9a4d46f4 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -437,15 +437,16 @@ static u64 zs_zpool_total_size(void *pool)
>  }
>
>  static struct zpool_driver zs_zpool_driver = {
> -       .type =         "zsmalloc",
> -       .owner =        THIS_MODULE,
> -       .create =       zs_zpool_create,
> -       .destroy =      zs_zpool_destroy,
> -       .malloc =       zs_zpool_malloc,
> -       .free =         zs_zpool_free,
> -       .map =          zs_zpool_map,
> -       .unmap =        zs_zpool_unmap,
> -       .total_size =   zs_zpool_total_size,
> +       .type =                   "zsmalloc",
> +       .owner =                  THIS_MODULE,
> +       .create =                 zs_zpool_create,
> +       .destroy =                zs_zpool_destroy,
> +       .malloc_support_movable = true,
> +       .malloc =                 zs_zpool_malloc,
> +       .free =                   zs_zpool_free,
> +       .map =                    zs_zpool_map,
> +       .unmap =                  zs_zpool_unmap,
> +       .total_size =             zs_zpool_total_size,
>  };
>
>  MODULE_ALIAS("zpool-zsmalloc");
> --
> 2.21.0 (Apple Git-120)
>

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