Re: [PATCHv2 bpf-next 2/9] bpf: Add missed value to kprobe_multi link info

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On Thu, Sep 7, 2023 at 12:13 AM Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
>
> Add missed value to kprobe_multi link info to hold the stats of missed
> kprobe_multi probe.
>
> The missed counter gets incremented when fprobe fails the recursion
> check or there's no rethook available for return probe. In either
> case the attached bpf program is not executed.
>
> Acked-by: Hou Tao <houtao1@xxxxxxxxxx>
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>

Reviewed-and-tested-by: Song Liu <song@xxxxxxxxxx>

> ---
>  include/uapi/linux/bpf.h       | 1 +
>  kernel/trace/bpf_trace.c       | 1 +
>  tools/include/uapi/linux/bpf.h | 1 +
>  3 files changed, 3 insertions(+)
>
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 73b155e52204..e5216420ec73 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -6530,6 +6530,7 @@ struct bpf_link_info {
>                         __aligned_u64 addrs;
>                         __u32 count; /* in/out: kprobe_multi function count */
>                         __u32 flags;
> +                       __u64 missed;
>                 } kprobe_multi;
>                 struct {
>                         __u32 type; /* enum bpf_perf_event_type */
> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index 279a3d370812..aec52938c703 100644
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -2614,6 +2614,7 @@ static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link,
>         kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link);
>         info->kprobe_multi.count = kmulti_link->cnt;
>         info->kprobe_multi.flags = kmulti_link->flags;
> +       info->kprobe_multi.missed = kmulti_link->fp.nmissed;
>
>         if (!uaddrs)
>                 return 0;
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index 73b155e52204..e5216420ec73 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -6530,6 +6530,7 @@ struct bpf_link_info {
>                         __aligned_u64 addrs;
>                         __u32 count; /* in/out: kprobe_multi function count */
>                         __u32 flags;
> +                       __u64 missed;
>                 } kprobe_multi;
>                 struct {
>                         __u32 type; /* enum bpf_perf_event_type */
> --
> 2.41.0
>
>





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