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From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	yrl.pp-manager.tt@hitachi.com, Oleg Nesterov <oleg@redhat.com>,
	Ingo Molnar <mingo@redhat.com>,
	Tom Zanussi <tom.zanussi@intel.com>
Subject: [PATCH 11/11] tracing/kprobes: Support soft-mode disabling
Date: Thu, 09 May 2013 14:44:54 +0900	[thread overview]
Message-ID: <20130509054454.30398.7237.stgit@mhiramat-M0-7522> (raw)
In-Reply-To: <20130509054405.30398.73831.stgit@mhiramat-M0-7522>

Support soft-mode disabling on kprobe-based dynamic events.
Soft-disabling is just ignoring recording if the soft disabled
flag is set.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Tom Zanussi <tom.zanussi@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
 kernel/trace/trace_kprobe.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index fee865d..636d45f 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -845,6 +845,9 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
 
 	WARN_ON(call != ftrace_file->event_call);
 
+	if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
+		return;
+
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 
@@ -893,6 +896,9 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 
 	WARN_ON(call != ftrace_file->event_call);
 
+	if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
+		return;
+
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 


      parent reply	other threads:[~2013-05-09  5:47 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-09  5:44 [PATCH 00/11] tracing: bugfix and kprobe-based dynamic event updates Masami Hiramatsu
2013-05-09  5:44 ` [PATCH 01/11] [BUGFIX] tracing: Return 0 if event_enable_func succeeded Masami Hiramatsu
2013-05-09 14:31   ` Steven Rostedt
2013-05-09 15:11     ` Steven Rostedt
2013-05-09 15:21   ` Steven Rostedt
2013-05-09  5:44 ` [PATCH 02/11] [BUGFIX] ftrace, kprobes: Fix a deadlock on ftrace_regex_lock Masami Hiramatsu
2013-05-09 14:47   ` Steven Rostedt
2013-05-09 15:41     ` Steven Rostedt
2013-05-09 16:27   ` Steven Rostedt
2013-05-09 16:34     ` Steven Rostedt
2013-05-09 17:08       ` Steven Rostedt
2013-05-10  1:40         ` Masami Hiramatsu
2013-05-10 13:38           ` Steven Rostedt
2013-05-09  5:44 ` [PATCH 03/11] ftrace: Cleanup regex_lock and ftrace_lock around hash updating Masami Hiramatsu
2013-05-09 17:12   ` Steven Rostedt
2013-05-09 22:09     ` Steven Rostedt
2013-05-09  5:44 ` [PATCH 04/11] [BUGFIX] tracing/kprobes: Fix to increment return event probe hit-count Masami Hiramatsu
2013-05-09  5:44 ` [PATCH 05/11] tracing: Indicate enabled soft-mode in enable file Masami Hiramatsu
2013-05-09  5:44 ` [PATCH 06/11] [BUGFIX] tracing: Modify soft-mode only if no other referrer Masami Hiramatsu
2013-05-09  5:44 ` [PATCH 07/11] [TRIVIAL] tracing/kprobes: Use bool for retprobe checker Masami Hiramatsu
2013-05-09  5:44 ` [PATCH 08/11] tracing/kprobes: Increment probe hit-count even if it is used by perf Masami Hiramatsu
2013-05-09  5:44 ` [PATCH 09/11] tracing/kprobes: Pass trace_probe directly from dispatcher Masami Hiramatsu
2013-05-09  5:44 ` [PATCH 10/11] tracing/kprobes: Support ftrace_event_file base multibuffer Masami Hiramatsu
2013-05-09  5:44 ` Masami Hiramatsu [this message]

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