linux-kernel - [PATCH 0/3] kallsyms: Optimize the search for module symbols by livepatch and bpf

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Message-ID: <20221230112729.351-1-thunder.leizhen@huawei.com>
Date:   Fri, 30 Dec 2022 19:27:26 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>, <bpf@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>,
        <live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        <linux-modules@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 0/3] kallsyms: Optimize the search for module symbols by livepatch and bpf

Patches 7-8 in [1] have been delayed until now due to merge conflicts. The
current patch 1/3 corresponds to patch 7/9 in [1], and the current patch 3/3
corresponds to patch 8/9 in [1]. But there are some changes. Originally, only
livepatch uses function module_kallsyms_on_each_symbol(), it find the specified
function for the specified module. Now, bpf also uses function
module_kallsyms_on_each_symbol(), it needs to traverse all the modules. So for
the new parameter 'modname' of module_kallsyms_on_each_symbol(), if it's NULL,
the symbols of all modules are still traversed for compatibility with the case
of bpf.

Patch 2/3 is new, as I understand it, it should be fine. If it doesn't work,
then patch 3/3 should be dropped.

[1] https://lkml.org/lkml/2022/11/2/225

Zhen Lei (3):
  livepatch: Improve the search performance of
    module_kallsyms_on_each_symbol()
  bpf: Optimize get_modules_for_addrs()
  kallsyms: Delete an unused parameter related to
    {module_}kallsyms_on_each_symbol()

 include/linux/kallsyms.h   |   3 +-
 include/linux/module.h     |   8 +--
 kernel/kallsyms.c          |   5 +-
 kernel/kallsyms_selftest.c |   6 +--
 kernel/livepatch/core.c    |  13 +----
 kernel/module/kallsyms.c   |  16 ++++--
 kernel/trace/bpf_trace.c   | 101 +++++++++++++++----------------------
 kernel/trace/ftrace.c      |   5 +-
 8 files changed, 67 insertions(+), 90 deletions(-)

-- 
2.25.1