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cpufreq: interactive: run at fraction of hispeed_freq when load is low

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When load is below go_hispeed_load, apply the percentage of CPU load to
a max frequency of hispeed_freq instead of the max speed.  This avoids
jumping too quickly to hispeed_freq when it is a relatively low
percentage of max speed.  This also allows go_hispeed_load to be set to
a high percentage relative to hispeed_freq (as a percentage of max speed,
again useful when hispeed_freq is a low fraction of max speed), to cap
larger loads at hispeed_freq.  For example, a load of 60% will typically
move to 60% of hispeed_freq, not 60% of max speed.  This causes the
governor to apply two different speed caps, depending on whether load is
below or above go_hispeed_load.

Also fix the type of hispeed_freq, which was u64, to match other
speed data types (and avoid overhead and allow division).

Change-Id: Ie2d0668be161c074aaad77db2037505431457b3a
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor
2012-10-03 00:39:56 -07:00
committed by John Stultz
parent 984e8bbd61
commit 53d77c97f2
1 changed files with 5 additions and 5 deletions
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10
drivers/cpufreq/cpufreq_interactive.c
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@@ -63,7 +63,7 @@ static cpumask_t speedchange_cpumask;
static spinlock_t speedchange_cpumask_lock;
/* Hi speed to bump to from lo speed when load burst (default max) */
static u64 hispeed_freq;
static unsigned int hispeed_freq;
/* Go to hi speed when CPU load at or above this value. */
#define DEFAULT_GO_HISPEED_LOAD 85
@@ -198,7 +198,7 @@ static void cpufreq_interactive_timer(unsigned long data)
}
}
} else {
new_freq = pcpu->policy->max * cpu_load / 100;
new_freq = hispeed_freq * cpu_load / 100;
}
if (new_freq <= hispeed_freq)
@@ -465,7 +465,7 @@ static void cpufreq_interactive_boost(void)
static ssize_t show_hispeed_freq(struct kobject *kobj,
struct attribute *attr, char *buf)
{
return sprintf(buf, "%llu\n", hispeed_freq);
return sprintf(buf, "%u\n", hispeed_freq);
}
static ssize_t store_hispeed_freq(struct kobject *kobj,
@@ -473,9 +473,9 @@ static ssize_t store_hispeed_freq(struct kobject *kobj,
size_t count)
{
int ret;
u64 val;
long unsigned int val;
ret = strict_strtoull(buf, 0, &val);
ret = strict_strtoul(buf, 0, &val);
if (ret < 0)
return ret;
hispeed_freq = val;