[PATCH 0/2] Enable new kprobe event at boot

Masami Hiramatsu
2019-05-21T07:56:23Z

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

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 subsys_initcall
tracing/kprobe: Add kprobe_event= boot parameter

Documentation/admin-guide/kernel-parameters.txt | 13 ++++++
Documentation/trace/kprobetrace.rst | 14 ++++++
kernel/kprobes.c | 2 -
kernel/trace/trace_kprobe.c | 54 +++++++++++++++++++++++
4 files changed, 82 insertions(+), 1 deletion(-)

--
Masami Hiramatsu (Linaro)