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Commit 2517b9d7 authored by Miguel de Dios's avatar Miguel de Dios Committed by Pranav Vashi
Browse files

kernel: sched: cpufreq_schedutil: Make iowait boost optional. 



Bug: 120438505
Change-Id: I59e3675a320ce71c3c90be3904756b125300ba6b
Signed-off-by: default avatarMiguel de Dios <migueldedios@google.com>
Signed-off-by: default avatarAlexander Winkowski <dereference23@outlook.com>
Signed-off-by: default avatarPranav Vashi <neobuddy89@gmail.com>
parent e93d7345

kernel/sched/cpufreq_schedutil.c

+30 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ struct sugov_tunables { 
	struct gov_attr_set attr_set;

	unsigned int		up_rate_limit_us;

	unsigned int		down_rate_limit_us;

	bool iowait_boost_enable;

};



struct sugov_policy {
@@ -238,6 +239,11 @@ static void sugov_get_util(unsigned long *util, unsigned long *max, int cpu) 
static void sugov_set_iowait_boost(struct sugov_cpu *sg_cpu, u64 time,

				   unsigned int flags)

{

	struct sugov_policy *sg_policy = sg_cpu->sg_policy;



	if (!sg_policy->tunables->iowait_boost_enable)

		return;



	/* Clear iowait_boost if the CPU apprears to have been idle. */

	if (sg_cpu->iowait_boost) {

		s64 delta_ns = time - sg_cpu->last_update;
@@ -535,12 +541,35 @@ static ssize_t down_rate_limit_us_store(struct gov_attr_set *attr_set, 
	return count;

}



static ssize_t iowait_boost_enable_show(struct gov_attr_set *attr_set,

                                        char *buf)

{

        struct sugov_tunables *tunables = to_sugov_tunables(attr_set);

        return snprintf(buf, PAGE_SIZE, "%u\n",

                        tunables->iowait_boost_enable);

}



static ssize_t iowait_boost_enable_store(struct gov_attr_set *attr_set,

                                         const char *buf, size_t count)

{

        struct sugov_tunables *tunables = to_sugov_tunables(attr_set);

        bool enable;

        if (kstrtobool(buf, &enable))

                return -EINVAL;



        tunables->iowait_boost_enable = enable;

        return count;

}



static struct governor_attr up_rate_limit_us = __ATTR_RW(up_rate_limit_us);

static struct governor_attr down_rate_limit_us = __ATTR_RW(down_rate_limit_us);

static struct governor_attr iowait_boost_enable =

	__ATTR_RW(iowait_boost_enable);



static struct attribute *sugov_attributes[] = {

	&up_rate_limit_us.attr,

	&down_rate_limit_us.attr,

	&iowait_boost_enable.attr,

	NULL

};
@@ -733,6 +762,7 @@ static int sugov_init(struct cpufreq_policy *policy) 
				cpufreq_policy_transition_delay_us(policy);

	tunables->down_rate_limit_us =

				cpufreq_policy_transition_delay_us(policy);

	tunables->iowait_boost_enable = false;



	policy->governor_data = sg_policy;

	sg_policy->tunables = tunables;