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Commit 8bd86be3 authored by Lina Iyer's avatar Lina Iyer
Browse files

cpuidle: record state entry failed statistics 



When CPUs fail to enter the chosen idle state because of pending
interrupt, let's record that and show along with other statistics for
the idle state.

Change-Id: I22265e8a86160c98a7ae810808b6b4821a6633b6
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
parent 67629947

drivers/cpuidle/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -18,6 +18,17 @@ if CPU_IDLE 
config CPU_IDLE_MULTIPLE_DRIVERS

        bool



config QGKI_CPUIDLE_FAILED_STAT

	bool "Record failed attempts at entering idle states"

	depends on QGKI

	help

	  CPU idle maintains statistics for successful entry to each idle

	  state. It is also useful to record statistics of failure to

	  enter each idle state.



	  Save and report the failed statistics in sysfs along with usage

	  statistics.



config CPU_IDLE_GOV_LADDER

	bool "Ladder governor (for periodic timer tick)"

drivers/cpuidle/cpuidle.c

+3 −0
Original line number Diff line number Diff line
@@ -291,6 +291,9 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, 
		}

	} else {

		dev->last_residency = 0;

#ifdef CONFIG_QGKI_CPUIDLE_FAILED_STAT

		dev->states_usage[index].failed++;

#endif

	}



	return entered_state;

drivers/cpuidle/sysfs.c

+9 −0
Original line number Diff line number Diff line
@@ -297,6 +297,9 @@ define_show_state_function(target_residency) 
define_show_state_function(power_usage)

define_show_state_ull_function(usage)

define_show_state_ull_function(time)

#ifdef CONFIG_QGKI_CPUIDLE_FAILED_STAT

define_show_state_ull_function(failed)

#endif

define_show_state_str_function(name)

define_show_state_str_function(desc)

define_show_state_ull_function(disable)
@@ -310,6 +313,9 @@ define_one_state_ro(latency, show_state_exit_latency); 
define_one_state_ro(residency, show_state_target_residency);

define_one_state_ro(power, show_state_power_usage);

define_one_state_ro(usage, show_state_usage);

#ifdef CONFIG_QGKI_CPUIDLE_FAILED_STAT

define_one_state_ro(failed, show_state_failed);

#endif

define_one_state_ro(time, show_state_time);

define_one_state_rw(disable, show_state_disable, store_state_disable);

define_one_state_ro(above, show_state_above);
@@ -322,6 +328,9 @@ static struct attribute *cpuidle_state_default_attrs[] = { 
	&attr_residency.attr,

	&attr_power.attr,

	&attr_usage.attr,

#ifdef CONFIG_QGKI_CPUIDLE_FAILED_STAT

	&attr_failed.attr,

#endif

	&attr_time.attr,

	&attr_disable.attr,

	&attr_above.attr,

include/linux/cpuidle.h

+3 −0
Original line number Diff line number Diff line
@@ -35,6 +35,9 @@ struct cpuidle_state_usage { 
	unsigned long long	time; /* in US */

	unsigned long long	above; /* Number of times it's been too deep */

	unsigned long long	below; /* Number of times it's been too shallow */

#ifdef CONFIG_QGKI_CPUIDLE_FAILED_STAT

	unsigned long long	failed; /* Number of times it failed to enter */

#endif

#ifdef CONFIG_SUSPEND

	unsigned long long	s2idle_usage;

	unsigned long long	s2idle_time; /* in US */