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tracing/osnoise: Remove TIMERLAT ifdefs from inside functions

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Remove CONFIG_TIMERLAT_TRACER from inside functions, avoiding
compilation problems in the future.

Link: https://lkml.kernel.org/r/8245abb5a112d249f5da6c1df499244ad9e647bc.1635702894.git.bristot@kernel.org

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: linux-rt-users@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2021-10-31 19:05:01 +01:00 committed by Steven Rostedt (VMware)
parent dae181349f
commit ccb6754495
1 changed files with 106 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

150
kernel/trace/trace_osnoise.c
View File

@ -321,6 +321,57 @@ static struct osnoise_data {
#endif
};
#ifdef CONFIG_TIMERLAT_TRACER
static inline bool timerlat_enabled(void)
{
return osnoise_data.timerlat_tracer;
}
static inline int timerlat_softirq_exit(struct osnoise_variables *osn_var)
{
struct timerlat_variables *tlat_var = this_cpu_tmr_var();
/*
* If the timerlat is enabled, but the irq handler did
* not run yet enabling timerlat_tracer, do not trace.
*/
if (!tlat_var->tracing_thread) {
osn_var->softirq.arrival_time = 0;
osn_var->softirq.delta_start = 0;
return 0;
}
return 1;
}
static inline int timerlat_thread_exit(struct osnoise_variables *osn_var)
{
struct timerlat_variables *tlat_var = this_cpu_tmr_var();
/*
* If the timerlat is enabled, but the irq handler did
* not run yet enabling timerlat_tracer, do not trace.
*/
if (!tlat_var->tracing_thread) {
osn_var->thread.delta_start = 0;
osn_var->thread.arrival_time = 0;
return 0;
}
return 1;
}
#else /* CONFIG_TIMERLAT_TRACER */
static inline bool timerlat_enabled(void)
{
return false;
}
static inline int timerlat_softirq_exit(struct osnoise_variables *osn_var)
{
return 1;
}
static inline int timerlat_thread_exit(struct osnoise_variables *osn_var)
{
return 1;
}
#endif
#ifdef CONFIG_PREEMPT_RT
/*
* Print the osnoise header info.
@ -978,21 +1029,9 @@ static void trace_softirq_exit_callback(void *data, unsigned int vec_nr)
if (!osn_var->sampling)
return;
#ifdef CONFIG_TIMERLAT_TRACER
/*
* If the timerlat is enabled, but the irq handler did
* not run yet enabling timerlat_tracer, do not trace.
*/
if (unlikely(osnoise_data.timerlat_tracer)) {
struct timerlat_variables *tlat_var;
tlat_var = this_cpu_tmr_var();
if (!tlat_var->tracing_thread) {
osn_var->softirq.arrival_time = 0;
osn_var->softirq.delta_start = 0;
if (unlikely(timerlat_enabled()))
if (!timerlat_softirq_exit(osn_var))
return;
}
}
#endif
duration = get_int_safe_duration(osn_var, &osn_var->softirq.delta_start);
trace_softirq_noise(vec_nr, osn_var->softirq.arrival_time, duration);
@ -1086,17 +1125,9 @@ thread_exit(struct osnoise_variables *osn_var, struct task_struct *t)
if (!osn_var->sampling)
return;
#ifdef CONFIG_TIMERLAT_TRACER
if (osnoise_data.timerlat_tracer) {
struct timerlat_variables *tlat_var;
tlat_var = this_cpu_tmr_var();
if (!tlat_var->tracing_thread) {
osn_var->thread.delta_start = 0;
osn_var->thread.arrival_time = 0;
if (unlikely(timerlat_enabled()))
if (!timerlat_thread_exit(osn_var))
return;
}
}
#endif
duration = get_int_safe_duration(osn_var, &osn_var->thread.delta_start);
@ -1600,6 +1631,11 @@ static int timerlat_main(void *data)
hrtimer_cancel(&tlat->timer);
return 0;
}
#else /* CONFIG_TIMERLAT_TRACER */
static int timerlat_main(void *data)
{
return 0;
}
#endif /* CONFIG_TIMERLAT_TRACER */
/*
@ -1642,16 +1678,13 @@ static int start_kthread(unsigned int cpu)
void *main = osnoise_main;
char comm[24];
#ifdef CONFIG_TIMERLAT_TRACER
if (osnoise_data.timerlat_tracer) {
if (timerlat_enabled()) {
snprintf(comm, 24, "timerlat/%d", cpu);
main = timerlat_main;
} else {
snprintf(comm, 24, "osnoise/%d", cpu);
}
#else
snprintf(comm, 24, "osnoise/%d", cpu);
#endif
kthread = kthread_create_on_cpu(main, NULL, cpu, comm);
if (IS_ERR(kthread)) {
@ -1945,6 +1978,35 @@ static const struct file_operations cpus_fops = {
.llseek = generic_file_llseek,
};
#ifdef CONFIG_TIMERLAT_TRACER
/*
* init_timerlat_tracefs - A function to initialize the timerlat interface files
*/
static int init_timerlat_tracefs(struct dentry *top_dir)
{
struct dentry *tmp;
#ifdef CONFIG_STACKTRACE
tmp = tracefs_create_file("print_stack", TRACE_MODE_WRITE, top_dir,
&osnoise_print_stack, &trace_min_max_fops);
if (!tmp)
return -ENOMEM;
#endif
tmp = tracefs_create_file("timerlat_period_us", TRACE_MODE_WRITE, top_dir,
&timerlat_period, &trace_min_max_fops);
if (!tmp)
return -ENOMEM;
return 0;
}
#else /* CONFIG_TIMERLAT_TRACER */
static int init_timerlat_tracefs(struct dentry *top_dir)
{
return 0;
}
#endif /* CONFIG_TIMERLAT_TRACER */
/*
* init_tracefs - A function to initialize the tracefs interface files
*
@ -1989,19 +2051,10 @@ static int init_tracefs(void)
tmp = trace_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops);
if (!tmp)
goto err;
#ifdef CONFIG_TIMERLAT_TRACER
#ifdef CONFIG_STACKTRACE
tmp = tracefs_create_file("print_stack", TRACE_MODE_WRITE, top_dir,
&osnoise_print_stack, &trace_min_max_fops);
if (!tmp)
goto err;
#endif
tmp = tracefs_create_file("timerlat_period_us", TRACE_MODE_WRITE, top_dir,
&timerlat_period, &trace_min_max_fops);
if (!tmp)
ret = init_timerlat_tracefs(top_dir);
if (ret)
goto err;
#endif
return 0;
@ -2207,6 +2260,16 @@ static struct tracer timerlat_tracer __read_mostly = {
.print_header = print_timerlat_headers,
.allow_instances = true,
};
__init static int init_timerlat_tracer(void)
{
return register_tracer(&timerlat_tracer);
}
#else /* CONFIG_TIMERLAT_TRACER */
__init static int init_timerlat_tracer(void)
{
return 0;
}
#endif /* CONFIG_TIMERLAT_TRACER */
__init static int init_osnoise_tracer(void)
@ -2223,13 +2286,12 @@ __init static int init_osnoise_tracer(void)
return ret;
}
#ifdef CONFIG_TIMERLAT_TRACER
ret = register_tracer(&timerlat_tracer);
ret = init_timerlat_tracer();
if (ret) {
pr_err(BANNER "Error registering timerlat\n");
pr_err(BANNER "Error registering timerlat!\n");
return ret;
}
#endif
osnoise_init_hotplug_support();
INIT_LIST_HEAD_RCU(&osnoise_instances);