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Code Issues Releases Wiki Activity

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>
This commit is contained in:
Steven Rostedt 2008-05-22 11:49:22 -04:00 committed by Thomas Gleixner
parent 41c52c0db9
commit 41bc8144d0
4 changed files with 19 additions and 13 deletions
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3
kernel/trace/trace.c
View File

@ -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;

4
kernel/trace/trace.h
View File

@ -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);

4
kernel/trace/trace_functions.c
View File

@ -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)

21
kernel/trace/trace_sched_switch.c
View File

@ -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;
}