From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
lkml <linux-kernel@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>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCHv4 bpf-next 0/5] bpf: Speed up symbol resolving in kprobe multi link
Date: Fri, 29 Apr 2022 07:28:11 -0700 [thread overview]
Message-ID: <CAEf4BzYtXWvBWzmadhLGqwf8_e2sruK6999th6c=b=O0WLkHOA@mail.gmail.com> (raw)
In-Reply-To: <20220428201207.954552-1-jolsa@kernel.org>
On Thu, Apr 28, 2022 at 1:12 PM Jiri Olsa <jolsa@kernel.org> wrote:
>
> hi,
> sending additional fix for symbol resolving in kprobe multi link
> requested by Alexei and Andrii [1].
>
> This speeds up bpftrace kprobe attachment, when using pure symbols
> (3344 symbols) to attach:
>
> Before:
>
> # perf stat -r 5 -e cycles ./src/bpftrace -e 'kprobe:x* { } i:ms:1 { exit(); }'
> ...
> 6.5681 +- 0.0225 seconds time elapsed ( +- 0.34% )
>
> After:
>
> # perf stat -r 5 -e cycles ./src/bpftrace -e 'kprobe:x* { } i:ms:1 { exit(); }'
> ...
> 0.5661 +- 0.0275 seconds time elapsed ( +- 4.85% )
>
> v4 changes:
> - fix compile issue [kernel test robot]
> - added acks [Andrii]
>
> v3 changes:
> - renamed kallsyms_lookup_names to ftrace_lookup_symbols
> and moved it to ftrace.c [Masami]
> - added ack [Andrii]
> - couple small test fixes [Andrii]
>
> v2 changes (first version [2]):
> - removed the 2 seconds check [Alexei]
> - moving/forcing symbols sorting out of kallsyms_lookup_names function [Alexei]
> - skipping one array allocation and copy_from_user [Andrii]
> - several small fixes [Masami,Andrii]
> - build fix [kernel test robot]
>
> thanks,
> jirka
>
>
> [1] https://lore.kernel.org/bpf/CAEf4BzZtQaiUxQ-sm_hH2qKPRaqGHyOfEsW96DxtBHRaKLoL3Q@mail.gmail.com/
> [2] https://lore.kernel.org/bpf/20220407125224.310255-1-jolsa@kernel.org/
> ---
> Jiri Olsa (5):
> kallsyms: Fully export kallsyms_on_each_symbol function
> ftrace: Add ftrace_lookup_symbols function
> fprobe: Resolve symbols with ftrace_lookup_symbols
> bpf: Resolve symbols with ftrace_lookup_symbols for kprobe multi link
> selftests/bpf: Add attach bench test
>
Please check [0], it reports rcu_read_unlock() misuse
[0] https://github.com/kernel-patches/bpf/runs/6223167405?check_suite_focus=true
> include/linux/ftrace.h | 6 ++++++
> include/linux/kallsyms.h | 7 ++++++-
> kernel/kallsyms.c | 3 +--
> kernel/trace/bpf_trace.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------
> kernel/trace/fprobe.c | 32 ++++++++++++--------------------
> kernel/trace/ftrace.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> tools/testing/selftests/bpf/progs/kprobe_multi_empty.c | 12 ++++++++++++
> 8 files changed, 298 insertions(+), 69 deletions(-)
> create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi_empty.c
next prev parent reply other threads:[~2022-04-29 14:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-28 20:12 [PATCHv4 bpf-next 0/5] bpf: Speed up symbol resolving in kprobe multi link Jiri Olsa
2022-04-28 20:12 ` [PATCHv4 bpf-next 1/5] kallsyms: Fully export kallsyms_on_each_symbol function Jiri Olsa
2022-04-29 14:51 ` Masami Hiramatsu
2022-04-28 20:12 ` [PATCHv4 bpf-next 2/5] ftrace: Add ftrace_lookup_symbols function Jiri Olsa
2022-04-29 14:56 ` Masami Hiramatsu
2022-04-28 20:12 ` [PATCHv4 bpf-next 3/5] fprobe: Resolve symbols with ftrace_lookup_symbols Jiri Olsa
2022-04-29 14:54 ` Masami Hiramatsu
2022-04-28 20:12 ` [PATCHv4 bpf-next 4/5] bpf: Resolve symbols with ftrace_lookup_symbols for kprobe multi link Jiri Olsa
2022-04-28 20:12 ` [PATCHv4 bpf-next 5/5] selftests/bpf: Add attach bench test Jiri Olsa
2022-04-29 14:28 ` Andrii Nakryiko [this message]
2022-04-30 12:14 ` [PATCHv4 bpf-next 0/5] bpf: Speed up symbol resolving in kprobe multi link Jiri Olsa
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