Re: [PATCH v2 bpf-next 2/4] bpf: expose program stats via bpf_prog_info

Return bpf program runtime and runcnt via bpf_prog_info

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
 include/uapi/linux/bpf.h | 2 ++
 kernel/bpf/syscall.c     | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index bcdd2474eee7..d2cb85d85b39 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h

@@ -2813,6 +2813,8 @@ struct bpf_prog_info {
        __u32 jited_line_info_rec_size;
        __u32 nr_prog_tags;
        __aligned_u64 prog_tags;
+       __u64 runtime;
+       __u64 runcnt;
 } __attribute__((aligned(8)));

 struct bpf_map_info {

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 9a8c990c5df4..3405e0a4cf77 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c

@@ -2152,6 +2152,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
        struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
        struct bpf_prog_info info = {};
        u32 info_len = attr->info.info_len;
+       struct bpf_prog_stats stats;
        char __user *uinsns;
        u32 ulen;
        int err;

@@ -2191,6 +2192,10 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
        if (err)
                return err;

+       bpf_prog_get_stats(prog, &stats);
+       info.runtime = stats.nsecs;
+       info.runcnt = stats.cnt;
+