cpufreq: interactive: configurable delay before raising above hispeed
Change-Id: I4d6ac40b23a3790d48e30c37408284e9f955e8fa
Signed-off-by: Todd Poynor <toddpoynor@google.com>
diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c
index 2fc514f..e73a4a9 100644
--- a/drivers/cpufreq/cpufreq_interactive.c
+++ b/drivers/cpufreq/cpufreq_interactive.c
@@ -82,6 +82,13 @@
#define DEFAULT_TIMER_RATE 20 * USEC_PER_MSEC
static unsigned long timer_rate;
+/*
+ * Wait this long before raising speed above hispeed, by default a single
+ * timer interval.
+ */
+#define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE
+static unsigned long above_hispeed_delay_val;
+
static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
unsigned int event);
@@ -173,6 +180,16 @@
if (new_freq < hispeed_freq)
new_freq = hispeed_freq;
+
+ if (pcpu->target_freq == hispeed_freq &&
+ new_freq > hispeed_freq &&
+ pcpu->timer_run_time - pcpu->target_set_time
+ < above_hispeed_delay_val) {
+ trace_cpufreq_interactive_notyet(data, cpu_load,
+ pcpu->target_freq,
+ new_freq);
+ goto rearm;
+ }
}
} else {
new_freq = pcpu->policy->max * cpu_load / 100;
@@ -514,6 +531,28 @@
static struct global_attr min_sample_time_attr = __ATTR(min_sample_time, 0644,
show_min_sample_time, store_min_sample_time);
+static ssize_t show_above_hispeed_delay(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ return sprintf(buf, "%lu\n", above_hispeed_delay_val);
+}
+
+static ssize_t store_above_hispeed_delay(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long val;
+
+ ret = strict_strtoul(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+ above_hispeed_delay_val = val;
+ return count;
+}
+
+define_one_global_rw(above_hispeed_delay);
+
static ssize_t show_timer_rate(struct kobject *kobj,
struct attribute *attr, char *buf)
{
@@ -539,6 +578,7 @@
static struct attribute *interactive_attributes[] = {
&hispeed_freq_attr.attr,
&go_hispeed_load_attr.attr,
+ &above_hispeed_delay.attr,
&min_sample_time_attr.attr,
&timer_rate_attr.attr,
NULL,
@@ -659,6 +699,7 @@
go_hispeed_load = DEFAULT_GO_HISPEED_LOAD;
min_sample_time = DEFAULT_MIN_SAMPLE_TIME;
+ above_hispeed_delay_val = DEFAULT_ABOVE_HISPEED_DELAY;
timer_rate = DEFAULT_TIMER_RATE;
/* Initalize per-cpu timers */