[PATCHv3 bpf-next 0/3] kallsyms: Optimize the search for module symbols by livepatch and bpf

From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
	Petr Mladek <pmladek@suse.com>,
	Zhen Lei <thunder.leizhen@huawei.com>
Cc: bpf@vger.kernel.org, live-patching@vger.kernel.org,
	linux-modules@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>,
	Joe Lawrence <joe.lawrence@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Luis Chamberlain <mcgrof@kernel.org>
Subject: [PATCHv3 bpf-next 0/3] kallsyms: Optimize the search for module symbols by livepatch and bpf
Date: Mon, 16 Jan 2023 11:10:06 +0100	[thread overview]
Message-ID: <20230116101009.23694-1-jolsa@kernel.org> (raw)

hi,
sending new version of [1] patchset posted originally by Zhen Lei.
It contains 2 changes that improove search performance for livepatch
and bpf.

v3 changes:
  - fixed off by 1 issue, simplified condition, added acks [Song]
  - added module attach as subtest [Andrii]

v2 changes:
  - reworked the bpf change and meassured the performance
  - adding new selftest to benchmark kprobe multi module attachment
  - skipping patch 3 as requested by Zhen Lei
  - added Reviewed-by for patch 1 [Petr Mladek]

thanks,
jirka

[1] https://lore.kernel.org/bpf/20221230112729.351-1-thunder.leizhen@huawei.com/
---
Jiri Olsa (2):
      selftests/bpf: Add serial_test_kprobe_multi_bench_attach_kernel/module tests
      bpf: Change modules resolving for kprobe multi link

Zhen Lei (1):
      livepatch: Improve the search performance of module_kallsyms_on_each_symbol()

 include/linux/module.h                                     |  6 ++++--
 kernel/livepatch/core.c                                    | 10 +---------
 kernel/module/kallsyms.c                                   | 13 ++++++++++++-
 kernel/trace/bpf_trace.c                                   | 93 +++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------
 kernel/trace/ftrace.c                                      |  2 +-
 tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 19 ++++++++++++++-----
 6 files changed, 79 insertions(+), 64 deletions(-)