On Sat, Feb 6, 2021 at 9:06 AM Alexei Starovoitov
<alexei.starovoitov@xxxxxxxxx> wrote:
>
> From: Alexei Starovoitov <ast@xxxxxxxxxx>
>
> Add per-program counter for number of times recursion prevention mechanism
> was triggered and expose it via show_fdinfo and bpf_prog_info.
> Teach bpftool to print it.
>
> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
> ---
Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
> include/linux/filter.h | 1 +
> include/uapi/linux/bpf.h | 1 +
> kernel/bpf/syscall.c | 14 ++++++++++----
> kernel/bpf/trampoline.c | 18 ++++++++++++++++--
> tools/bpf/bpftool/prog.c | 5 +++++
> tools/include/uapi/linux/bpf.h | 1 +
> 6 files changed, 34 insertions(+), 6 deletions(-)
>
[...]
> static void print_prog_json(struct bpf_prog_info *info, int fd)
> @@ -446,6 +448,9 @@ static void print_prog_header_plain(struct bpf_prog_info *info)
> if (info->run_time_ns)
> printf(" run_time_ns %lld run_cnt %lld",
> info->run_time_ns, info->run_cnt);
> + if (info->recursion_misses)
> + printf(" recursion_misses %lld",
> + info->recursion_misses);
no need for wrapping the line
> printf("\n");
> }
>
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index c001766adcbc..c547ad1ffe43 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -4501,6 +4501,7 @@ struct bpf_prog_info {
> __aligned_u64 prog_tags;
> __u64 run_time_ns;
> __u64 run_cnt;
> + __u64 recursion_misses;
> } __attribute__((aligned(8)));
>
> struct bpf_map_info {
> --
> 2.24.1
>
