netdev - Re: [PATCH bpf-next v2 09/35] bpf: memcg-based memory accounting for bpf ringbuffer

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Date:   Mon, 27 Jul 2020 16:56:27 -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 09/35] bpf: memcg-based memory accounting for
 bpf ringbuffer

On Mon, Jul 27, 2020 at 12:22 PM Roman Gushchin <guro@...com> wrote:
>
> Enable the memcg-based memory accounting for the memory used by
> the bpf ringbuffer.
>
> Signed-off-by: Roman Gushchin <guro@...com>

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

> ---
>  kernel/bpf/ringbuf.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/bpf/ringbuf.c b/kernel/bpf/ringbuf.c
> index 002f8a5c9e51..e8e2c39cbdc9 100644
> --- a/kernel/bpf/ringbuf.c
> +++ b/kernel/bpf/ringbuf.c
> @@ -60,8 +60,8 @@ struct bpf_ringbuf_hdr {
>
>  static struct bpf_ringbuf *bpf_ringbuf_area_alloc(size_t data_sz, int numa_node)
>  {
> -       const gfp_t flags = GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN |
> -                           __GFP_ZERO;
> +       const gfp_t flags = GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL |
> +                           __GFP_NOWARN | __GFP_ZERO;
>         int nr_meta_pages = RINGBUF_PGOFF + RINGBUF_POS_PAGES;
>         int nr_data_pages = data_sz >> PAGE_SHIFT;
>         int nr_pages = nr_meta_pages + nr_data_pages;
> @@ -89,7 +89,8 @@ static struct bpf_ringbuf *bpf_ringbuf_area_alloc(size_t data_sz, int numa_node)
>          */
>         array_size = (nr_meta_pages + 2 * nr_data_pages) * sizeof(*pages);
>         if (array_size > PAGE_SIZE)
> -               pages = vmalloc_node(array_size, numa_node);
> +               pages = __vmalloc_node(array_size, 1, GFP_KERNEL_ACCOUNT,
> +                                      numa_node, __builtin_return_address(0));
>         else
>                 pages = kmalloc_node(array_size, flags, numa_node);
>         if (!pages)
> @@ -167,7 +168,7 @@ static struct bpf_map *ringbuf_map_alloc(union bpf_attr *attr)
>                 return ERR_PTR(-E2BIG);
>  #endif
>
> -       rb_map = kzalloc(sizeof(*rb_map), GFP_USER);
> +       rb_map = kzalloc(sizeof(*rb_map), GFP_USER | __GFP_ACCOUNT);
>         if (!rb_map)
>                 return ERR_PTR(-ENOMEM);
>
> --
> 2.26.2
>