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Date: Thu, 22 May 2008 11:49:22 -0400 (EDT)
From: Steven Rostedt <rostedt@...dmis.org>
To: Ingo Molnar <mingo@...e.hu>
cc: Peter Zijlstra <peterz@...radead.org>,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] ftrace: fix up cmdline recording
The new work with converting the trace hooks over to markers broke the
command line recording of ftrace. This patch fixes it again.
Signed-off-by: Steven Rostedt <srostedt@...hat.com>
---
kernel/trace/trace.c | 3 ---
kernel/trace/trace.h | 4 ++--
kernel/trace/trace_functions.c | 4 ++--
kernel/trace/trace_sched_switch.c | 21 +++++++++++++++------
4 files changed, 19 insertions(+), 13 deletions(-)
Index: linux-tip.git/kernel/trace/trace.h
===================================================================
--- linux-tip.git.orig/kernel/trace/trace.h 2008-05-21 13:25:34.000000000 -0400
+++ linux-tip.git/kernel/trace/trace.h 2008-05-22 11:19:19.000000000 -0400
@@ -225,6 +225,8 @@ void trace_function(struct trace_array *
void tracing_start_function_trace(void);
void tracing_stop_function_trace(void);
+void tracing_start_cmdline_record(void);
+void tracing_stop_cmdline_record(void);
int register_tracer(struct tracer *type);
void unregister_tracer(struct tracer *type);
@@ -233,8 +235,6 @@ extern unsigned long nsecs_to_usecs(unsi
extern unsigned long tracing_max_latency;
extern unsigned long tracing_thresh;
-extern atomic_t trace_record_cmdline_enabled;
-
void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
void update_max_tr_single(struct trace_array *tr,
struct task_struct *tsk, int cpu);
Index: linux-tip.git/kernel/trace/trace_functions.c
===================================================================
--- linux-tip.git.orig/kernel/trace/trace_functions.c 2008-05-21 13:25:34.000000000 -0400
+++ linux-tip.git/kernel/trace/trace_functions.c 2008-05-22 11:27:32.000000000 -0400
@@ -29,14 +29,14 @@ static void function_reset(struct trace_
static void start_function_trace(struct trace_array *tr)
{
function_reset(tr);
- atomic_inc(&trace_record_cmdline_enabled);
+ tracing_start_cmdline_record();
tracing_start_function_trace();
}
static void stop_function_trace(struct trace_array *tr)
{
tracing_stop_function_trace();
- atomic_dec(&trace_record_cmdline_enabled);
+ tracing_stop_cmdline_record();
}
static void function_trace_init(struct trace_array *tr)
Index: linux-tip.git/kernel/trace/trace_sched_switch.c
===================================================================
--- linux-tip.git.orig/kernel/trace/trace_sched_switch.c 2008-05-22 08:04:49.000000000 -0400
+++ linux-tip.git/kernel/trace/trace_sched_switch.c 2008-05-22 11:26:13.000000000 -0400
@@ -29,6 +29,9 @@ sched_switch_func(void *private, void *_
long disabled;
int cpu;
+ tracing_record_cmdline(prev);
+ tracing_record_cmdline(next);
+
if (!tracer_enabled)
return;
@@ -63,8 +66,6 @@ sched_switch_callback(void *probe_data,
prev = va_arg(*args, typeof(prev));
next = va_arg(*args, typeof(next));
- tracing_record_cmdline(prev);
-
/*
* If tracer_switch_func only points to the local
* switch func, it still needs the ptr passed to it.
@@ -123,18 +124,26 @@ void tracing_stop_sched_switch(void)
tracing_sched_unregister();
}
+void tracing_start_cmdline_record(void)
+{
+ tracing_start_sched_switch();
+}
+
+void tracing_stop_cmdline_record(void)
+{
+ tracing_stop_sched_switch();
+}
+
static void start_sched_trace(struct trace_array *tr)
{
sched_switch_reset(tr);
- atomic_inc(&trace_record_cmdline_enabled);
tracer_enabled = 1;
- tracing_start_sched_switch();
+ tracing_start_cmdline_record();
}
static void stop_sched_trace(struct trace_array *tr)
{
- tracing_stop_sched_switch();
- atomic_dec(&trace_record_cmdline_enabled);
+ tracing_stop_cmdline_record();
tracer_enabled = 0;
}
Index: linux-tip.git/kernel/trace/trace.c
===================================================================
--- linux-tip.git.orig/kernel/trace/trace.c 2008-05-22 08:04:49.000000000 -0400
+++ linux-tip.git/kernel/trace/trace.c 2008-05-22 11:27:10.000000000 -0400
@@ -652,9 +652,6 @@ static char saved_cmdlines[SAVED_CMDLINE
static int cmdline_idx;
static DEFINE_SPINLOCK(trace_cmdline_lock);
-/* trace in all context switches */
-atomic_t trace_record_cmdline_enabled __read_mostly;
-
/* temporary disable recording */
atomic_t trace_record_cmdline_disabled __read_mostly;
--
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