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Message-ID: <20090205200200.GB9846@ghostprotocols.net>
Date: Thu, 5 Feb 2009 18:02:00 -0200
From: Arnaldo Carvalho de Melo <acme@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...e.hu>,
Frédéric Weisbecker <fweisbec@...il.com>,
Jens Axboe <jens.axboe@...cle.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH tip 1/1] trace: Call tracing_reset_online_cpus before
tracer->init()
Impact: cleanup
To make it easy for ftrace plugin writers, as this was open coded in
the existing plugins
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Jens Axboe <jens.axboe@...cle.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
block/blktrace.c | 2 --
kernel/trace/trace.c | 8 +++++++-
kernel/trace/trace.h | 1 +
kernel/trace/trace_branch.c | 1 -
kernel/trace/trace_functions.c | 17 +++--------------
kernel/trace/trace_functions_graph.c | 1 -
kernel/trace/trace_hw_branches.c | 1 -
kernel/trace/trace_nop.c | 1 -
kernel/trace/trace_sched_switch.c | 8 +-------
kernel/trace/trace_selftest.c | 18 +++++++++---------
kernel/trace/trace_sysprof.c | 14 ++++----------
11 files changed, 25 insertions(+), 47 deletions(-)
diff --git a/block/blktrace.c b/block/blktrace.c
index 834cd84..ca6d320 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -1086,8 +1086,6 @@ static void blk_tracer_print_header(struct seq_file *m)
static void blk_tracer_start(struct trace_array *tr)
{
- tracing_reset_online_cpus(tr);
-
mutex_lock(&blk_probe_mutex);
if (atomic_add_return(1, &blk_probes_ref) == 1)
if (blk_register_tracepoints())
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8fad377..ef4dbac 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2171,6 +2171,12 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf,
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
+int tracer_init(struct tracer *t, struct trace_array *tr)
+{
+ tracing_reset_online_cpus(tr);
+ return t->init(tr);
+}
+
static int tracing_set_tracer(const char *buf)
{
struct trace_array *tr = &global_trace;
@@ -2195,7 +2201,7 @@ static int tracing_set_tracer(const char *buf)
current_trace = t;
if (t->init) {
- ret = t->init(tr);
+ ret = tracer_init(t, tr);
if (ret)
goto out;
}
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index e03f157..f2742fb 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -395,6 +395,7 @@ struct trace_iterator {
cpumask_var_t started;
};
+int tracer_init(struct tracer *t, struct trace_array *tr);
int tracing_is_enabled(void);
void trace_wake_up(void);
void tracing_reset(struct trace_array *tr, int cpu);
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index 48b2196..f8ae2c5 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -131,7 +131,6 @@ static void stop_branch_trace(struct trace_array *tr)
static int branch_trace_init(struct trace_array *tr)
{
- tracing_reset_online_cpus(tr);
start_branch_trace(tr);
return 0;
}
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index d067cea..36bf956 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -24,32 +24,21 @@ static struct trace_array *func_trace;
static void tracing_start_function_trace(void);
static void tracing_stop_function_trace(void);
-static void start_function_trace(struct trace_array *tr)
+static int function_trace_init(struct trace_array *tr)
{
func_trace = tr;
tr->cpu = get_cpu();
- tracing_reset_online_cpus(tr);
put_cpu();
tracing_start_cmdline_record();
tracing_start_function_trace();
-}
-
-static void stop_function_trace(struct trace_array *tr)
-{
- tracing_stop_function_trace();
- tracing_stop_cmdline_record();
-}
-
-static int function_trace_init(struct trace_array *tr)
-{
- start_function_trace(tr);
return 0;
}
static void function_trace_reset(struct trace_array *tr)
{
- stop_function_trace(tr);
+ tracing_stop_function_trace();
+ tracing_stop_cmdline_record();
}
static void function_trace_start(struct trace_array *tr)
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index c97594d..222f97d 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -56,7 +56,6 @@ static int graph_trace_init(struct trace_array *tr)
&trace_graph_entry);
if (ret)
return ret;
- tracing_reset_online_cpus(tr);
tracing_start_cmdline_record();
return 0;
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index 2aa1c9f..ca4bbcf 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -132,7 +132,6 @@ static int bts_trace_init(struct trace_array *tr)
hw_branch_trace = tr;
register_hotcpu_notifier(&bts_hotcpu_notifier);
- tracing_reset_online_cpus(tr);
bts_trace_start(tr);
return 0;
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
index 087b6cb..9aa84bd 100644
--- a/kernel/trace/trace_nop.c
+++ b/kernel/trace/trace_nop.c
@@ -48,7 +48,6 @@ static void stop_nop_trace(struct trace_array *tr)
static int nop_trace_init(struct trace_array *tr)
{
ctx_trace = tr;
- tracing_reset_online_cpus(tr);
start_nop_trace(tr);
return 0;
}
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index c4f9add..30e14fe 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -185,12 +185,6 @@ void tracing_sched_switch_assign_trace(struct trace_array *tr)
ctx_trace = tr;
}
-static void start_sched_trace(struct trace_array *tr)
-{
- tracing_reset_online_cpus(tr);
- tracing_start_sched_switch_record();
-}
-
static void stop_sched_trace(struct trace_array *tr)
{
tracing_stop_sched_switch_record();
@@ -199,7 +193,7 @@ static void stop_sched_trace(struct trace_array *tr)
static int sched_switch_trace_init(struct trace_array *tr)
{
ctx_trace = tr;
- start_sched_trace(tr);
+ tracing_start_sched_switch_record();
return 0;
}
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 5013812..445700e 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -115,7 +115,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
ftrace_set_filter(func_name, strlen(func_name), 1);
/* enable tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
goto out;
@@ -189,7 +189,7 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
ftrace_enabled = 1;
tracer_enabled = 1;
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
goto out;
@@ -236,7 +236,7 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
int ret;
/* start the tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
return ret;
@@ -290,7 +290,7 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
}
/* start the tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
return ret;
@@ -344,7 +344,7 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
}
/* start the tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
goto out;
@@ -476,7 +476,7 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
wait_for_completion(&isrt);
/* start the tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
return ret;
@@ -537,7 +537,7 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
int ret;
/* start the tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
return ret;
@@ -569,7 +569,7 @@ trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
int ret;
/* start the tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
return 0;
@@ -596,7 +596,7 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
int ret;
/* start the tracing */
- ret = trace->init(tr);
+ ret = tracer_init(trace, tr);
if (ret) {
warn_failed_init_tracer(trace, ret);
return ret;
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index eaca5ad..84ca9d8 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -226,15 +226,6 @@ static void stop_stack_timers(void)
stop_stack_timer(cpu);
}
-static void start_stack_trace(struct trace_array *tr)
-{
- mutex_lock(&sample_timer_lock);
- tracing_reset_online_cpus(tr);
- start_stack_timers();
- tracer_enabled = 1;
- mutex_unlock(&sample_timer_lock);
-}
-
static void stop_stack_trace(struct trace_array *tr)
{
mutex_lock(&sample_timer_lock);
@@ -247,7 +238,10 @@ static int stack_trace_init(struct trace_array *tr)
{
sysprof_trace = tr;
- start_stack_trace(tr);
+ mutex_lock(&sample_timer_lock);
+ start_stack_timers();
+ tracer_enabled = 1;
+ mutex_unlock(&sample_timer_lock);
return 0;
}
--
1.6.0.6
--
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