linux-kernel - Re: [PATCH bpf-next v2 21/35] bpf: eliminate rlimit-based memory accounting for reuseport

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Message-ID: <CAPhsuW5-SK0GyvpDzEWf4SW+fJ3PpoT8q0GmamRDjydPqNk_ew@mail.gmail.com>
Date:   Mon, 27 Jul 2020 22:36:00 -0700
From:   Song Liu <song@...nel.org>
To:     Roman Gushchin <guro@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 21/35] bpf: eliminate rlimit-based memory
 accounting for reuseport_array maps

On Mon, Jul 27, 2020 at 12:23 PM Roman Gushchin <guro@...com> wrote:
>
> Do not use rlimit-based memory accounting for reuseport_array maps.
> It has been replaced with the memcg-based memory accounting.
>
> Signed-off-by: Roman Gushchin <guro@...com>

Acked-by: Song Liu <songliubraving@...com>

> ---
>  kernel/bpf/reuseport_array.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/kernel/bpf/reuseport_array.c b/kernel/bpf/reuseport_array.c
> index 90b29c5b1da7..9d0161fdfec7 100644
> --- a/kernel/bpf/reuseport_array.c
> +++ b/kernel/bpf/reuseport_array.c
> @@ -150,9 +150,8 @@ static void reuseport_array_free(struct bpf_map *map)
>
>  static struct bpf_map *reuseport_array_alloc(union bpf_attr *attr)
>  {
> -       int err, numa_node = bpf_map_attr_numa_node(attr);
> +       int numa_node = bpf_map_attr_numa_node(attr);
>         struct reuseport_array *array;
> -       struct bpf_map_memory mem;
>         u64 array_size;
>
>         if (!bpf_capable())
> @@ -161,20 +160,13 @@ static struct bpf_map *reuseport_array_alloc(union bpf_attr *attr)
>         array_size = sizeof(*array);
>         array_size += (u64)attr->max_entries * sizeof(struct sock *);
>
> -       err = bpf_map_charge_init(&mem, array_size);
> -       if (err)
> -               return ERR_PTR(err);
> -
>         /* allocate all map elements and zero-initialize them */
>         array = bpf_map_area_alloc(array_size, numa_node);
> -       if (!array) {
> -               bpf_map_charge_finish(&mem);
> +       if (!array)
>                 return ERR_PTR(-ENOMEM);
> -       }
>
>         /* copy mandatory map attributes */
>         bpf_map_init_from_attr(&array->map, attr);
> -       bpf_map_charge_move(&array->map.memory, &mem);
>
>         return &array->map;
>  }
> --
> 2.26.2
>