linux-kernel - [PATCH 0/3] perf probe: Boot time tracing support

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Message-Id: <162282409255.452340.4645118932261585719.stgit@devnote2>
Date:   Sat,  5 Jun 2021 01:28:12 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org
Subject: [PATCH 0/3] perf probe: Boot time tracing support

Hi,

Here is a series of patches to add boot-time tracing support to perf
probe command.
Recently, I tried to debug kernel boot process with boot-time tracing
and I found perf probe lacks some features for it.

[1/3] fixes perf probe to show probe definitions on __init functions.
Since __init functions are removed after boot (and those are not in
.text but .inittext section), perf's map object can not find them.
[2/3] is a code cleanup preparing for the next patch.
[3/3] adds --bootconfig option for showing the probe definitions in
the bootconfig format. This option can be used with -D (--definition)
option.

One todo is improving -F option. Since the -F option also using the
map object, it can not list up the __init function. Anyway, that may
not be important. Usually, the person who debugs kernel already know
the target function name, and can use "perf probe -L func" for
checking the function source code. (Note that perf probe -L doesn't
depend on map object)

Thank you,

---

Masami Hiramatsu (3):
      perf/probe: Support probes on init functions for offline kernel
      perf/probe: Cleanup synthesize_probe_trace_command
      perf/probe: Add --bootconfig to output definition in bootconfig format

 tools/perf/builtin-probe.c    |   12 +++
 tools/perf/util/probe-event.c |  167 +++++++++++++++++++++++++++++++----------
 tools/perf/util/probe-event.h |    2 
 3 files changed, 141 insertions(+), 40 deletions(-)

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