linux-kernel - Re: [PATCH bpf-next v2 01/35] bpf: memcg-based memory accounting for bpf progs

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Message-ID: <CAPhsuW49mOQYCx77jucJ_NkeYhoSxOZ_cCujBUjgMdJBy3keeg@mail.gmail.com>
Date:   Mon, 27 Jul 2020 15:11:42 -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 01/35] bpf: memcg-based memory accounting for
 bpf progs

On Mon, Jul 27, 2020 at 12:20 PM Roman Gushchin <guro@...com> wrote:
>
> Include memory used by bpf programs into the memcg-based accounting.
> This includes the memory used by programs itself, auxiliary data
> and statistics.
>
> Signed-off-by: Roman Gushchin <guro@...com>
> ---
>  kernel/bpf/core.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
> index bde93344164d..daab8dcafbd4 100644
> --- a/kernel/bpf/core.c
> +++ b/kernel/bpf/core.c
> @@ -77,7 +77,7 @@ void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, int k, uns
>
>  struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags)
>  {
> -       gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags;
> +       gfp_t gfp_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO | gfp_extra_flags;
>         struct bpf_prog_aux *aux;
>         struct bpf_prog *fp;
>
> @@ -86,7 +86,7 @@ struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flag
>         if (fp == NULL)
>                 return NULL;
>
> -       aux = kzalloc(sizeof(*aux), GFP_KERNEL | gfp_extra_flags);
> +       aux = kzalloc(sizeof(*aux), GFP_KERNEL_ACCOUNT | gfp_extra_flags);
>         if (aux == NULL) {
>                 vfree(fp);
>                 return NULL;
> @@ -104,7 +104,7 @@ struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flag
>
>  struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags)
>  {
> -       gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags;
> +       gfp_t gfp_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO | gfp_extra_flags;
>         struct bpf_prog *prog;
>         int cpu;
>
> @@ -217,7 +217,7 @@ void bpf_prog_free_linfo(struct bpf_prog *prog)
>  struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
>                                   gfp_t gfp_extra_flags)
>  {
> -       gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags;
> +       gfp_t gfp_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO | gfp_extra_flags;
>         struct bpf_prog *fp;
>         u32 pages, delta;
>         int ret;
> --

Do we need similar changes in

bpf_prog_array_copy()
bpf_prog_alloc_jited_linfo()
bpf_prog_clone_create()

and maybe a few more?

Thanks,
Song