netdev - Re: [PATCH bpf-next v2 25/35] bpf: eliminate rlimit-based memory accounting for socket storage maps

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Message-ID: <CAPhsuW4jBU973ZzouXuxnueBoNEGnnyvt4M5CusmcWyTyttJAg@mail.gmail.com>
Date:   Mon, 27 Jul 2020 22:41:58 -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 25/35] bpf: eliminate rlimit-based memory
 accounting for socket storage maps

On Mon, Jul 27, 2020 at 12:26 PM Roman Gushchin <guro@...com> wrote:
>
> Do not use rlimit-based memory accounting for socket storage maps.
> It has been replaced with the memcg-based memory accounting.
>
> Signed-off-by: Roman Gushchin <guro@...com>

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

> ---
>  net/core/bpf_sk_storage.c | 11 -----------
>  1 file changed, 11 deletions(-)
>
> diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
> index fbcd03cd00d3..c0a35b6368af 100644
> --- a/net/core/bpf_sk_storage.c
> +++ b/net/core/bpf_sk_storage.c
> @@ -676,8 +676,6 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
>         struct bpf_sk_storage_map *smap;
>         unsigned int i;
>         u32 nbuckets;
> -       u64 cost;
> -       int ret;
>
>         smap = kzalloc(sizeof(*smap), GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
>         if (!smap)
> @@ -688,18 +686,9 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
>         /* Use at least 2 buckets, select_bucket() is undefined behavior with 1 bucket */
>         nbuckets = max_t(u32, 2, nbuckets);
>         smap->bucket_log = ilog2(nbuckets);
> -       cost = sizeof(*smap->buckets) * nbuckets + sizeof(*smap);
> -
> -       ret = bpf_map_charge_init(&smap->map.memory, cost);
> -       if (ret < 0) {
> -               kfree(smap);
> -               return ERR_PTR(ret);
> -       }
> -
>         smap->buckets = kvcalloc(sizeof(*smap->buckets), nbuckets,
>                                  GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
>         if (!smap->buckets) {
> -               bpf_map_charge_finish(&smap->map.memory);
>                 kfree(smap);
>                 return ERR_PTR(-ENOMEM);
>         }
> --
> 2.26.2
>