linux-kernel - Re: [PATCH bpf-next v4 02/30] bpf: memcg-based memory accounting for bpf progs

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Message-ID: <20200825222628.GD2250889@carbon.dhcp.thefacebook.com>
Date:   Tue, 25 Aug 2020 15:26:28 -0700
From:   Roman Gushchin <guro@...com>
To:     Shakeel Butt <shakeelb@...gle.com>
CC:     <bpf@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH bpf-next v4 02/30] bpf: memcg-based memory accounting for
 bpf progs

On Tue, Aug 25, 2020 at 12:00:15PM -0700, Shakeel Butt wrote:
> On Fri, Aug 21, 2020 at 8:01 AM 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 ed0b3578867c..021fff2df81b 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;
> > --
> > 2.26.2
> >
> 
> What about prog->aux->jited_linfo in bpf_prog_alloc_jited_linfo()?

I tried to approximately match the existing accounting, so didn't include this one.
But I agree, this is a good candidate for the inclusion. Will add in v5.

Thanks!