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Commit 8b78cf60 authored by Yi Yang's avatar Yi Yang Committed by Len Brown
Browse files

cpuidle: fix cpuidle time and usage overflow 



cpuidle C-state sysfs node time and usage are very easy to overflow because
they are all of unsigned int type, time will overflow within about two hours,
usage will take longer time to overflow, but they are increasing for ever.

This patch will convert them to unsigned long long.

Signed-off-by: default avatarYi Yang <yi.y.yang@intel.com>
Acked-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 996520c1

drivers/cpuidle/cpuidle.c

+1 −1
Original line number Diff line number Diff line
@@ -67,7 +67,7 @@ static void cpuidle_idle_call(void) 
	/* enter the state and update stats */

	dev->last_residency = target_state->enter(dev, target_state);

	dev->last_state = target_state;

	target_state->time += dev->last_residency;

	target_state->time += (unsigned long long)dev->last_residency;

	target_state->usage++;



	/* give the governor an opportunity to reflect on the outcome */

drivers/cpuidle/sysfs.c

+8 −2
Original line number Diff line number Diff line
@@ -218,6 +218,12 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ 
	return sprintf(buf, "%u\n", state->_name);\

}



#define define_show_state_ull_function(_name) \

static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \

{ \

	return sprintf(buf, "%llu\n", state->_name);\

}



#define define_show_state_str_function(_name) \

static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \

{ \
@@ -228,8 +234,8 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \ 


define_show_state_function(exit_latency)

define_show_state_function(power_usage)

define_show_state_function(usage)

define_show_state_function(time)

define_show_state_ull_function(usage)

define_show_state_ull_function(time)

define_show_state_str_function(name)

define_show_state_str_function(desc)

include/linux/cpuidle.h

+2 −2
Original line number Diff line number Diff line
@@ -38,8 +38,8 @@ struct cpuidle_state { 
	unsigned int	power_usage; /* in mW */

	unsigned int	target_residency; /* in US */



	unsigned int	usage;

	unsigned int	time; /* in US */

	unsigned long long	usage;

	unsigned long long	time; /* in US */



	int (*enter)	(struct cpuidle_device *dev,

			 struct cpuidle_state *state);