linux-kernel - Re: [PATCH v5 0/9] tracing: Improbe BTF support on probe events

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Date:   Tue, 22 Aug 2023 00:09:39 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>, bpf@...r.kernel.org,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH v5 0/9] tracing: Improbe BTF support on probe events

Hi Steve,

Can you review this series?
I would like to push this to for-next.

Thank you,

On Mon,  7 Aug 2023 11:54:28 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> Hi,
> 
> Here is the 5th version of series to improve the BTF support on probe events.
> The previous series is here:
> 
> https://lore.kernel.org/all/169078860386.173706.3091034523220945605.stgit@devnote2/
> 
> This version introduces kernel/trace/trace_btf.c to separate the btf generic
> functions. These functions will be moved to btf.c next merge window.
> This fixes the member-search function to return the bit-offset of the
> parent anonymous union/structure. Thus the caller can calculate the real
> bit-offset from the root data structure.
> This also fixes the ftrace selftest issue which fails if the kernel
> supports only BTF args but not support field access.
> 
> This series can be applied on top of "probes/core" branch of
> https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git/
> 
> You can also get this series from:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git topic/fprobe-event-ext
> 
> Thank you,
> 
> ---
> 
> Masami Hiramatsu (Google) (9):
>       tracing/probes: Support BTF argument on module functions
>       tracing/probes: Move finding func-proto API and getting func-param API to trace_btf
>       tracing/probes: Add a function to search a member of a struct/union
>       tracing/probes: Support BTF based data structure field access
>       tracing/probes: Support BTF field access from $retval
>       tracing/probes: Add string type check with BTF
>       tracing/fprobe-event: Assume fprobe is a return event by $retval
>       selftests/ftrace: Add BTF fields access testcases
>       Documentation: tracing: Update fprobe event example with BTF field
> 
> 
>  Documentation/trace/fprobetrace.rst                |   64 ++-
>  include/linux/btf.h                                |    1 
>  kernel/bpf/btf.c                                   |    2 
>  kernel/trace/Makefile                              |    1 
>  kernel/trace/trace.c                               |    3 
>  kernel/trace/trace_btf.c                           |  109 ++++
>  kernel/trace/trace_btf.h                           |   11 
>  kernel/trace/trace_eprobe.c                        |    4 
>  kernel/trace/trace_fprobe.c                        |   59 ++
>  kernel/trace/trace_kprobe.c                        |    1 
>  kernel/trace/trace_probe.c                         |  499 +++++++++++++++-----
>  kernel/trace/trace_probe.h                         |   27 +
>  kernel/trace/trace_uprobe.c                        |    1 
>  .../ftrace/test.d/dynevent/add_remove_btfarg.tc    |   20 +
>  .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |   10 
>  15 files changed, 637 insertions(+), 175 deletions(-)
>  create mode 100644 kernel/trace/trace_btf.c
>  create mode 100644 kernel/trace/trace_btf.h
> 
> --
> Masami Hiramatsu (Google) <mhiramat@...nel.org>


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>