netdev - Re: [PATCH bpf-next v2 20/35] bpf: eliminate rlimit-based memory accounting for queue_stack

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Date:   Mon, 27 Jul 2020 22:35:19 -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 20/35] bpf: eliminate rlimit-based memory
 accounting for queue_stack_maps maps

On Mon, Jul 27, 2020 at 12:25 PM Roman Gushchin <guro@...com> wrote:
>
> Do not use rlimit-based memory accounting for queue_stack 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/queue_stack_maps.c | 16 ++++------------
>  1 file changed, 4 insertions(+), 12 deletions(-)
>
> diff --git a/kernel/bpf/queue_stack_maps.c b/kernel/bpf/queue_stack_maps.c
> index 44184f82916a..92e73c35a34a 100644
> --- a/kernel/bpf/queue_stack_maps.c
> +++ b/kernel/bpf/queue_stack_maps.c
> @@ -66,29 +66,21 @@ static int queue_stack_map_alloc_check(union bpf_attr *attr)
>
>  static struct bpf_map *queue_stack_map_alloc(union bpf_attr *attr)
>  {
> -       int ret, numa_node = bpf_map_attr_numa_node(attr);
> -       struct bpf_map_memory mem = {0};
> +       int numa_node = bpf_map_attr_numa_node(attr);
>         struct bpf_queue_stack *qs;
> -       u64 size, queue_size, cost;
> +       u64 size, queue_size;
>
>         size = (u64) attr->max_entries + 1;
> -       cost = queue_size = sizeof(*qs) + size * attr->value_size;
> -
> -       ret = bpf_map_charge_init(&mem, cost);
> -       if (ret < 0)
> -               return ERR_PTR(ret);
> +       queue_size = sizeof(*qs) + size * attr->value_size;
>
>         qs = bpf_map_area_alloc(queue_size, numa_node);
> -       if (!qs) {
> -               bpf_map_charge_finish(&mem);
> +       if (!qs)
>                 return ERR_PTR(-ENOMEM);
> -       }
>
>         memset(qs, 0, sizeof(*qs));
>
>         bpf_map_init_from_attr(&qs->map, attr);
>
> -       bpf_map_charge_move(&qs->map.memory, &mem);
>         qs->size = size;
>
>         raw_spin_lock_init(&qs->lock);
> --
> 2.26.2
>