linux-kernel - [PATCH v2 0/2] tracing/probes: Add 'symstr' type for probes

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Date:   Thu, 27 Oct 2022 00:48:19 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Primiano Tucci <primiano@...gle.com>
Subject: [PATCH v2 0/2] tracing/probes: Add 'symstr' type for probes

Hi,

Here is the 2nd version of the patches to add the 'symstr' type for
kprobe/eprobe events.
This version removes redundant strlen()[1/2] and fixes indentation
[2/2].

This type converts given value into kernel symbol string and stores
it as a dymanic symbol in the trace ring buffer entry. Thus, user who
reads the raw ring buffer data doesn't need to resolve the symbol
name afterwards.

This is similar to the existing 'symbol' type. The 'symbol' type
stores the address value itself to the entry, it only *shows* the
symbol name when it is printed.

Thank you,

---

Masami Hiramatsu (Google) (2):
      tracing/probes: Add symstr type for dynamic events
      tracing/probes: Reject symbol/symstr type for uprobe

 Documentation/trace/kprobetrace.rst                |    8 ++
 kernel/trace/trace.c                               |    2 -
 kernel/trace/trace_probe.c                         |   65 +++++++++++++-------
 kernel/trace/trace_probe.h                         |   19 ++++--
 kernel/trace/trace_probe_tmpl.h                    |   47 ++++++++++++++
 kernel/trace/trace_uprobe.c                        |    3 +
 .../ftrace/test.d/kprobe/uprobe_syntax_errors.tc   |    5 ++
 7 files changed, 113 insertions(+), 36 deletions(-)

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