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Commit 1f820e14 authored by Lina Iyer's avatar Lina Iyer
Browse files

cpuidle: menu: trace menu governor decisions 



Enable debugging of menu governor's choices by tracing at different
points.

Change-Id: Ia72a92cd74b5ae02bd0e504ec66653e680e9df7e
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
parent 67629947

drivers/cpuidle/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -24,6 +24,15 @@ config CPU_IDLE_GOV_LADDER 
config CPU_IDLE_GOV_MENU

	bool "Menu governor (for tickless system)"



config QGKI_MENU_GOV_DEBUG

	bool "Trace menu governor decisions"

	depends on QGKI && CPU_IDLE_GOV_MENU && FTRACE

	help

	  Trace menu governor decisions to help understand the system

	  state. The predicted sleep time, latency requirement for the

	  CPU and the idle state chosen based on the parameters are all

	  logged in the trace.



config CPU_IDLE_GOV_TEO

	bool "Timer events oriented (TEO) governor (for tickless systems)"

	help

drivers/cpuidle/governors/menu.c

+17 −0
Original line number Diff line number Diff line
@@ -18,6 +18,9 @@ 
#include <linux/sched/loadavg.h>

#include <linux/sched/stat.h>

#include <linux/math64.h>

#ifdef CONFIG_QGKI_MENU_GOV_DEBUG

#include <trace/events/power.h>

#endif



/*

 * Please note when changing the tuning values:
@@ -277,6 +280,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, 
{

	struct menu_device *data = this_cpu_ptr(&menu_devices);

	int latency_req = cpuidle_governor_latency_req(dev->cpu);

#ifdef CONFIG_QGKI_MENU_GOV_DEBUG

	int qos = latency_req;

#endif

	int i;

	int idx;

	unsigned int interactivity_req;
@@ -305,6 +311,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, 
		 * polling one.

		 */

		*stop_tick = !(drv->states[0].flags & CPUIDLE_FLAG_POLLING);

#ifdef CONFIG_QGKI_MENU_GOV_DEBUG

		trace_cpuidle_select(dev->cpu, 0, 0, *stop_tick, 0);

#endif

		return 0;

	}
@@ -393,6 +402,11 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, 
			    s->target_residency <= ktime_to_us(delta_next))

				idx = i;



#ifdef CONFIG_QGKI_MENU_GOV_DEBUG

			trace_cpuidle_select(dev->cpu, predicted_us, qos,

					     *stop_tick, idx);

#endif



			return idx;

		}

		if (s->exit_latency > latency_req)
@@ -433,6 +447,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, 
		}

	}



#ifdef CONFIG_QGKI_MENU_GOV_DEBUG

	trace_cpuidle_select(dev->cpu, predicted_us, qos, *stop_tick, idx);

#endif

	return idx;

}

include/trace/events/power.h

+30 −0
Original line number Diff line number Diff line
@@ -40,6 +40,36 @@ DEFINE_EVENT(cpu, cpu_idle, 
	TP_ARGS(state, cpu_id)

);



#ifdef CONFIG_QGKI_MENU_GOV_DEBUG

TRACE_EVENT(cpuidle_select,



	TP_PROTO(int cpu, long residency, unsigned int latency, bool tick,

		 int idx),



	TP_ARGS(cpu, residency, latency, tick, idx),



	TP_STRUCT__entry(

			 __field(int,  cpu)

			 __field(long, residency)

			 __field(u32,  latency)

			 __field(bool, tick)

			 __field(int,  idx)

	),



	TP_fast_assign(

		       __entry->cpu = cpu;

		       __entry->residency = residency;

		       __entry->latency = latency;

		       __entry->tick = tick;

		       __entry->idx = idx;

	),



	TP_printk("cpu: %d residency: %lld latency: %d tick: %d idx: %d",

		  __entry->cpu, __entry->residency, __entry->latency,

		  __entry->tick, __entry->idx)

);

#endif



TRACE_EVENT(powernv_throttle,



	TP_PROTO(int chip_id, const char *reason, int pmax),