lkml.org 
[lkml]   [2019]   [May]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/2] Enable new kprobe event at boot
Date
Hi,

This v2 series adds a kernel parameter, 'kprobe_event=' to add and enable
new kprobe events at boot time.

In this version, I changed to use postcore_initcall() instead of
subsys_initcall() for kprobes initialization.

Currently ftrace can enable some existing trace events at boot time.
This also allows admin/developer to add new kprobe-events at boot
time to debug device drivers etc.

The syntax is similar to tracing/kprobe_events interface, but
uses ',' and ';' instead of ' ' and '\n' respectively. e.g.

kprobe_event=p,func1,$arg1,$arg2;p,func2,$arg1

will add probes on func1 with the 1st and the 2nd arguments and on
func2 with the 1st argument.

Note that 'trace_event=' option enables trace event at very early
timing, but the events added by 'kprobe_event=' are enabled right
before enabling device drivers at this point. It is enough for
tracing device driver initialization etc.

Thank you,

---

Masami Hiramatsu (2):
kprobes: Initialize kprobes at postcore_initcall
tracing/kprobe: Add kprobe_event= boot parameter


Documentation/admin-guide/kernel-parameters.txt | 13 ++++++
Documentation/trace/kprobetrace.rst | 14 ++++++
kernel/kprobes.c | 3 -
kernel/trace/trace_kprobe.c | 54 +++++++++++++++++++++++
4 files changed, 82 insertions(+), 2 deletions(-)

--
Masami Hiramatsu (Linaro)

\
 
 \ /
  Last update: 2019-05-22 10:33    [W:0.084 / U:61.216 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site