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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	"Naveen N . Rao" <naveen.n.rao@linux.ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	"David S . Miller" <davem@davemloft.net>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: [PATCH 0/2] Enable new kprobe event at boot
Date: Tue, 21 May 2019 16:56:16 +0900	[thread overview]
Message-ID: <155842537599.4253.14690293652007233645.stgit@devnote2> (raw)

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)

             reply	other threads:[~2019-05-21  7:56 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-21  7:56 Masami Hiramatsu [this message]
2019-05-21  7:56 ` [PATCH 1/2] kprobes: Initialize kprobes at subsys_initcall Masami Hiramatsu
2019-05-21  7:56 ` [PATCH 2/2] tracing/kprobe: Add kprobe_event= boot parameter Masami Hiramatsu
2019-05-21 13:33 ` [PATCH 0/2] Enable new kprobe event at boot Steven Rostedt
2019-05-21 15:39   ` Masami Hiramatsu
2019-05-22  7:30     ` Masami Hiramatsu
2019-05-22  8:02       ` Masami Hiramatsu

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