diff options
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_osnoise.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c index c265ec5f1726..220172cb874d 100644 --- a/kernel/trace/trace_osnoise.c +++ b/kernel/trace/trace_osnoise.c @@ -1286,6 +1286,22 @@ static __always_inline void osnoise_stop_tracing(void) } /* + * osnoise_has_tracing_on - Check if there is at least one instance on + */ +static __always_inline int osnoise_has_tracing_on(void) +{ + struct osnoise_instance *inst; + int trace_is_on = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(inst, &osnoise_instances, list) + trace_is_on += tracer_tracing_is_on(inst->tr); + rcu_read_unlock(); + + return trace_is_on; +} + +/* * notify_new_max_latency - Notify a new max latency via fsnotify interface. */ static void notify_new_max_latency(u64 latency) @@ -1517,13 +1533,16 @@ static struct cpumask save_cpumask; /* * osnoise_sleep - sleep until the next period */ -static void osnoise_sleep(void) +static void osnoise_sleep(bool skip_period) { u64 interval; ktime_t wake_time; mutex_lock(&interface_lock); - interval = osnoise_data.sample_period - osnoise_data.sample_runtime; + if (skip_period) + interval = osnoise_data.sample_period; + else + interval = osnoise_data.sample_period - osnoise_data.sample_runtime; mutex_unlock(&interface_lock); /* @@ -1604,8 +1623,14 @@ static int osnoise_main(void *data) if (osnoise_migration_pending()) break; + /* skip a period if tracing is off on all instances */ + if (!osnoise_has_tracing_on()) { + osnoise_sleep(true); + continue; + } + run_osnoise(); - osnoise_sleep(); + osnoise_sleep(false); } migrate_enable(); |