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authorSteven Rostedt <rostedt@goodmis.org>2008-05-22 11:49:22 -0400
committerThomas Gleixner <tglx@linutronix.de>2008-05-26 22:51:49 +0200
commit41bc8144d02028133bcd1d545023c6f49e8b2411 (patch)
tree382a6bbd0560df129c27b490aca36404edd7b19a
parent41c52c0db9607e59f90da7da5309489fa06e887f (diff)
downloadop-kernel-dev-41bc8144d02028133bcd1d545023c6f49e8b2411.zip
op-kernel-dev-41bc8144d02028133bcd1d545023c6f49e8b2411.tar.gz
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@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--kernel/trace/trace.c3
-rw-r--r--kernel/trace/trace.h4
-rw-r--r--kernel/trace/trace_functions.c4
-rw-r--r--kernel/trace/trace_sched_switch.c21
4 files changed, 19 insertions, 13 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 583fe24..0feae23 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -652,9 +652,6 @@ static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN];
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;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index c460e85..6b8bd88 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -218,6 +218,8 @@ void trace_function(struct trace_array *tr,
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);
@@ -226,8 +228,6 @@ extern unsigned long nsecs_to_usecs(unsigned long nsecs);
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);
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 0a08465..7ee7dcd 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -29,14 +29,14 @@ static void function_reset(struct trace_array *tr)
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)
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 798ec0d..c16935d 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -29,6 +29,9 @@ sched_switch_func(void *private, void *__rq, struct task_struct *prev,
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, void *call_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.
@@ -213,18 +214,26 @@ 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;
}
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