OSN_DEFAULTS = 0,
OSN_WORKLOAD,
OSN_PANIC_ON_STOP,
+ OSN_PREEMPT_DISABLE,
+ OSN_IRQ_DISABLE,
OSN_MAX
};
-static const char * const osnoise_options_str[OSN_MAX] = { "DEFAULTS", "OSNOISE_WORKLOAD", "PANIC_ON_STOP" };
+static const char * const osnoise_options_str[OSN_MAX] = {
+ "DEFAULTS",
+ "OSNOISE_WORKLOAD",
+ "PANIC_ON_STOP",
+ "OSNOISE_PREEMPT_DISABLE",
+ "OSNOISE_IRQ_DISABLE" };
#define OSN_DEFAULT_OPTIONS 0x2
static unsigned long osnoise_options = OSN_DEFAULT_OPTIONS;
*/
static int run_osnoise(void)
{
+ bool disable_irq = test_bit(OSN_IRQ_DISABLE, &osnoise_options);
struct osnoise_variables *osn_var = this_cpu_osn_var();
u64 start, sample, last_sample;
u64 last_int_count, int_count;
s64 noise = 0, max_noise = 0;
s64 total, last_total = 0;
struct osnoise_sample s;
+ bool disable_preemption;
unsigned int threshold;
u64 runtime, stop_in;
u64 sum_noise = 0;
int hw_count = 0;
int ret = -1;
+ /*
+ * Disabling preemption is only required if IRQs are enabled,
+ * and the options is set on.
+ */
+ disable_preemption = !disable_irq && test_bit(OSN_PREEMPT_DISABLE, &osnoise_options);
+
/*
* Considers the current thread as the workload.
*/
*/
threshold = tracing_thresh ? : 5000;
+ /*
+ * Apply PREEMPT and IRQ disabled options.
+ */
+ if (disable_irq)
+ local_irq_disable();
+
+ if (disable_preemption)
+ preempt_disable();
+
/*
* Make sure NMIs see sampling first
*/
* cond_resched()
*/
if (IS_ENABLED(CONFIG_PREEMPT_RCU)) {
- local_irq_disable();
+ if (!disable_irq)
+ local_irq_disable();
+
rcu_momentary_dyntick_idle();
- local_irq_enable();
+
+ if (!disable_irq)
+ local_irq_enable();
}
/*
* For the non-preemptive kernel config: let threads runs, if
- * they so wish.
+ * they so wish, unless set not do to so.
*/
- cond_resched();
+ if (!disable_irq && !disable_preemption)
+ cond_resched();
last_sample = sample;
last_int_count = int_count;
*/
barrier();
+ /*
+ * Return to the preemptive state.
+ */
+ if (disable_preemption)
+ preempt_enable();
+
+ if (disable_irq)
+ local_irq_enable();
+
/*
* Save noise info.
*/