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cpufreq: interactive: Add sysfs boost interface for hints from userspace

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The explicit hint on/off version.

Change-Id: Ibf62b6d45bf6fb8c9c055b9bdaf074ce9374c04f
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor 2012-04-23 20:42:41 -07:00 committed by Arve Hjønnevåg
parent b6c0f567e7
commit 77417b69a8
3 changed files with 60 additions and 4 deletions
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3
Documentation/cpu-freq/governors.txt
View file

@ -267,6 +267,9 @@ not idle. Default is 20000 uS.
input_boost: If non-zero, boost speed of all CPUs to hispeed_freq on
touchscreen activity. Default is 0.
boost: If non-zero, immediately boost speed of all CPUs to
hispeed_freq. If zero, allow CPU speeds to drop below hispeed_freq.
3. The Governor Interface in the CPUfreq Core
=============================================

48
drivers/cpufreq/cpufreq_interactive.c
View file

@ -31,12 +31,11 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <asm/cputime.h>
#define CREATE_TRACE_POINTS
#include <trace/events/cpufreq_interactive.h>
#include <asm/cputime.h>
static atomic_t active_count = ATOMIC_INIT(0);
struct cpufreq_interactive_cpuinfo {
@ -94,7 +93,7 @@ static unsigned long timer_rate;
static unsigned long above_hispeed_delay_val;
/*
* Boost to hispeed on touchscreen input.
* Boost pulse to hispeed on touchscreen input.
*/
static int input_boost_val;
@ -106,6 +105,12 @@ struct cpufreq_interactive_inputopen {
static struct cpufreq_interactive_inputopen inputopen;
/*
* Non-zero means longer-term speed boost active.
*/
static int boost_val;
static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
unsigned int event);
@ -189,7 +194,7 @@ static void cpufreq_interactive_timer(unsigned long data)
if (load_since_change > cpu_load)
cpu_load = load_since_change;
if (cpu_load >= go_hispeed_load) {
if (cpu_load >= go_hispeed_load || boost_val) {
if (pcpu->target_freq <= pcpu->policy->min) {
new_freq = hispeed_freq;
} else {
@ -517,6 +522,12 @@ static void cpufreq_interactive_boost(void)
wake_up_process(up_task);
}
/*
* Pulsed boost on input event raises CPUs to hispeed_freq and lets
* usual algorithm of min_sample_time decide when to allow speed
* to drop.
*/
static void cpufreq_interactive_input_event(struct input_handle *handle,
unsigned int type,
unsigned int code, int value)
@ -732,6 +743,34 @@ static ssize_t store_input_boost(struct kobject *kobj, struct attribute *attr,
define_one_global_rw(input_boost);
static ssize_t show_boost(struct kobject *kobj, struct attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", boost_val);
}
static ssize_t store_boost(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
boost_val = val;
if (boost_val)
cpufreq_interactive_boost();
else
trace_cpufreq_interactive_unboost(hispeed_freq);
return count;
}
define_one_global_rw(boost);
static struct attribute *interactive_attributes[] = {
&hispeed_freq_attr.attr,
&go_hispeed_load_attr.attr,
@ -739,6 +778,7 @@ static struct attribute *interactive_attributes[] = {
&min_sample_time_attr.attr,
&timer_rate_attr.attr,
&input_boost.attr,
&boost.attr,
NULL,
};

13
include/trace/events/cpufreq_interactive.h
View file

@ -93,6 +93,19 @@ TRACE_EVENT(cpufreq_interactive_boost,
),
TP_printk("freq=%lu", __entry->freq)
);
TRACE_EVENT(cpufreq_interactive_unboost,
TP_PROTO(unsigned long freq),
TP_ARGS(freq),
TP_STRUCT__entry(
__field(unsigned long, freq)
),
TP_fast_assign(
__entry->freq = freq;
),
TP_printk("freq=%lu", __entry->freq)
);
#endif /* _TRACE_CPUFREQ_INTERACTIVE_H */
/* This part must be outside protection */