GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-03-17 12:34:01 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

tracing/osnoise: Make osnoise_main to sleep for microseconds

Browse source 
osnoise's runtime and period are in the microseconds scale, but it is
currently sleeping in the millisecond's scale. This behavior roots in the
usage of hwlat as the skeleton for osnoise.

Make osnoise to sleep in the microseconds scale. Also, move the sleep to
a specialized function.

Link: https://lkml.kernel.org/r/302aa6c7bdf2d131719b22901905e9da122a11b2.1645197336.git.bristot@kernel.org

Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2022-02-18 16:17:38 +01:00 • committed by Steven Rostedt (Google)
parent ab2f993c01
commit dd990352f0
1 changed files with 32 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

53
kernel/trace/trace_osnoise.c
View file

@ -1436,6 +1436,37 @@ out:
static struct cpumask osnoise_cpumask;
static struct cpumask save_cpumask;
/*
* osnoise_sleep - sleep until the next period
*/
static void osnoise_sleep(void)
{
u64 interval;
ktime_t wake_time;
mutex_lock(&interface_lock);
interval = osnoise_data.sample_period - osnoise_data.sample_runtime;
mutex_unlock(&interface_lock);
/*
* differently from hwlat_detector, the osnoise tracer can run
* without a pause because preemption is on.
*/
if (!interval) {
/* Let synchronize_rcu_tasks() make progress */
cond_resched_tasks_rcu_qs();
return;
}
wake_time = ktime_add_us(ktime_get(), interval);
__set_current_state(TASK_INTERRUPTIBLE);
while (schedule_hrtimeout_range(&wake_time, 0, HRTIMER_MODE_ABS)) {
if (kthread_should_stop())
break;
}
}
/*
* osnoise_main - The osnoise detection kernel thread
*
@ -1444,30 +1475,10 @@ static struct cpumask save_cpumask;
*/
static int osnoise_main(void *data)
{
u64 interval;
while (!kthread_should_stop()) {
run_osnoise();
mutex_lock(&interface_lock);
interval = osnoise_data.sample_period - osnoise_data.sample_runtime;
mutex_unlock(&interface_lock);
do_div(interval, USEC_PER_MSEC);
/*
* differently from hwlat_detector, the osnoise tracer can run
* without a pause because preemption is on.
*/
if (interval < 1) {
/* Let synchronize_rcu_tasks() make progress */
cond_resched_tasks_rcu_qs();
continue;
}
if (msleep_interruptible(interval))
break;
osnoise_sleep();
}
return 0;