[0/2] tracing/probes: Add 'symstr' type for probes

Message

Masami Hiramatsu (Google) Oct. 22, 2022, 6:38 a.m. UTC

Hi,

Here is a couple of patches to add the 'symstr' type for kprobe/eprobe
events.
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) <[e-mail]>