Current, od_init() uses get_cpu_idle_time_us() to check whether
idle micro accouting is supported. The get_cpu_idle_time_us()
returns -1 only when tick nohz is disabled. This patch is to use
tick_nohz_check() directly to check nohz enable status instead of
get_cpu_idle_time_us(). This can avoid unnecessary getting and
putting cpu.
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/cpufreq/cpufreq_ondemand.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 18d4091..7db2468 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -475,8 +475,6 @@ static struct attribute_group od_attr_group_gov_pol = {
static int od_init(struct dbs_data *dbs_data)
{
struct od_dbs_tuners *tuners;
- u64 idle_time;
- int cpu;
tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
if (!tuners) {
@@ -484,10 +482,7 @@ static int od_init(struct dbs_data *dbs_data)
return -ENOMEM;
}
- cpu = get_cpu();
- idle_time = get_cpu_idle_time_us(cpu, NULL);
- put_cpu();
- if (idle_time != -1ULL) {
+ if (tick_nohz_check()) {
/* Idle micro accounting is supported. Use finer thresholds */
tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
/*
--
1.8.4.rc0.1.g8f6a3e5.dirty
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