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Commit 5afb026c authored by Sabyasachi Singh's avatar Sabyasachi Singh Committed by Gerrit - the friendly Code Review server
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core_ctl: Add sysfs node to disable core_ctl 



This core ctl enable sysfs node can be used to enable
and disable the core isolation by core ctl in runtime
for the cluster. By default enable is set to 1, core
ctl is enabled. if this gets set to 0 then isolated
cores, if any, would get available to scheduler for
load balancing and core_ctl will not do any core
isolation.

Change-Id: I0a6df52ec5d9c50f1b722ca0ca8bb195bf04183c
Signed-off-by: default avatarSabyasachi Singh <sssingh@codeaurora.org>
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent a16173ef

kernel/sched/core_ctl.c

+28 −1
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ struct cluster_data { 
	bool pending;

	spinlock_t pending_lock;

	bool is_big_cluster;

	bool enable;

	int nrrun;

	struct task_struct *core_ctl_thread;

	unsigned int first_cpu;
@@ -247,6 +248,29 @@ static ssize_t show_is_big_cluster(const struct cluster_data *state, char *buf) 
	return snprintf(buf, PAGE_SIZE, "%u\n", state->is_big_cluster);

}



static ssize_t store_enable(struct cluster_data *state,

				const char *buf, size_t count)

{

	unsigned int val;

	bool bval;



	if (sscanf(buf, "%u\n", &val) != 1)

		return -EINVAL;



	bval = !!val;

	if (bval != state->enable) {

		state->enable = bval;

		apply_need(state);

	}



	return count;

}



static ssize_t show_enable(const struct cluster_data *state, char *buf)

{

	return scnprintf(buf, PAGE_SIZE, "%u\n", state->enable);

}



static ssize_t show_need_cpus(const struct cluster_data *state, char *buf)

{

	return snprintf(buf, PAGE_SIZE, "%u\n", state->need_cpus);
@@ -377,6 +401,7 @@ core_ctl_attr_ro(need_cpus); 
core_ctl_attr_ro(active_cpus);

core_ctl_attr_ro(global_state);

core_ctl_attr_rw(not_preferred);

core_ctl_attr_rw(enable);



static struct attribute *default_attrs[] = {

	&min_cpus.attr,
@@ -386,6 +411,7 @@ static struct attribute *default_attrs[] = { 
	&busy_down_thres.attr,

	&task_thres.attr,

	&is_big_cluster.attr,

	&enable.attr,

	&need_cpus.attr,

	&active_cpus.attr,

	&global_state.attr,
@@ -529,7 +555,7 @@ static bool eval_need(struct cluster_data *cluster) 


	spin_lock_irqsave(&state_lock, flags);



	if (cluster->boost) {

	if (cluster->boost || !cluster->enable) {

		need_cpus = cluster->max_cpus;

	} else {

		cluster->active_cpus = get_active_cpu_count(cluster);
@@ -1020,6 +1046,7 @@ static int cluster_init(const struct cpumask *mask) 
	cluster->offline_delay_ms = 100;

	cluster->task_thres = UINT_MAX;

	cluster->nrrun = cluster->num_cpus;

	cluster->enable = true;

	INIT_LIST_HEAD(&cluster->lru);

	spin_lock_init(&cluster->pending_lock);