From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Hou Tao <houtao1@huawei.com>, Daniel Xu <dxu@dxuuu.xyz>
Subject: [PATCH bpf-next 03/12] bpf: Count stats for kprobe_multi programs
Date: Mon, 28 Aug 2023 09:55:28 +0200 [thread overview]
Message-ID: <20230828075537.194192-4-jolsa@kernel.org> (raw)
In-Reply-To: <20230828075537.194192-1-jolsa@kernel.org>
Adding support to gather stats for kprobe_multi programs.
We now count:
- missed stats due to bpf_prog_active protection (always)
- cnt/nsec of the bpf program execution (if kernel.bpf_stats_enabled=1)
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
kernel/trace/bpf_trace.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index a7264b2c17ad..0a8685fc1eee 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2706,18 +2706,24 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link,
.link = link,
.entry_ip = entry_ip,
};
+ struct bpf_prog *prog = link->link.prog;
struct bpf_run_ctx *old_run_ctx;
+ u64 start;
int err;
if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) {
+ bpf_prog_inc_misses_counter(prog);
err = 0;
goto out;
}
+
migrate_disable();
rcu_read_lock();
old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
- err = bpf_prog_run(link->link.prog, regs);
+ start = bpf_prog_start_time();
+ err = bpf_prog_run(prog, regs);
+ bpf_prog_update_prog_stats(prog, start);
bpf_reset_run_ctx(old_run_ctx);
rcu_read_unlock();
migrate_enable();
--
2.41.0
next prev parent reply other threads:[~2023-08-28 7:56 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-28 7:55 [PATCH bpf-next 00/12] bpf: Add missed stats for kprobes Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 01/12] bpf: Move update_prog_stats to syscall object Jiri Olsa
2023-08-28 17:25 ` Alexei Starovoitov
2023-08-29 8:00 ` Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 02/12] bpf: Move bpf_prog_start_time to linux/filter.h Jiri Olsa
2023-09-04 13:12 ` Hou Tao
2023-08-28 7:55 ` Jiri Olsa [this message]
2023-09-04 13:30 ` [PATCH bpf-next 03/12] bpf: Count stats for kprobe_multi programs Hou Tao
2023-09-05 6:15 ` Hou Tao
2023-09-05 7:19 ` Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 04/12] bpf: Add missed value to kprobe_multi link info Jiri Olsa
2023-09-04 13:33 ` Hou Tao
2023-08-28 7:55 ` [PATCH bpf-next 05/12] bpf: Add missed value to kprobe perf " Jiri Olsa
2023-09-05 2:23 ` Hou Tao
2023-09-05 7:19 ` Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 06/12] bpf: Count missed stats in trace_call_bpf Jiri Olsa
2023-08-28 17:32 ` Alexei Starovoitov
2023-08-29 8:04 ` Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 07/12] bpf: Move bpf_prog_run_array down in the header file Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 08/12] bpf: Count run stats in bpf_prog_run_array Jiri Olsa
2023-09-05 2:40 ` Hou Tao
2023-09-05 7:19 ` Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 09/12] bpftool: Display missed count for kprobe_multi link Jiri Olsa
2023-08-29 16:40 ` Quentin Monnet
2023-08-30 10:46 ` Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 10/12] bpftool: Display missed count for kprobe perf link Jiri Olsa
2023-08-29 16:42 ` Quentin Monnet
2023-08-30 16:01 ` Jiri Olsa
2023-08-28 7:55 ` [PATCH bpf-next 11/12] selftests/bpf: Add test missed counts of perf event link kprobe Jiri Olsa
2023-09-05 3:14 ` Hou Tao
2023-08-28 7:55 ` [PATCH bpf-next 12/12] selftests/bpf: Add test recursion stats " Jiri Olsa
2023-09-05 3:23 ` Hou Tao
2023-09-05 3:30 ` [PATCH bpf-next 00/12] bpf: Add missed stats for kprobes Hou Tao
2023-09-05 7:20 ` Jiri Olsa
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