evie/android_kernel_oneplus_msm8998
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core_ctl: Add sysfs node to disable core_ctl

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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: I856ec9358f3ceb781468e2537b4d086e4d4600f0
Signed-off-by: Sabyasachi Singh <sssingh@codeaurora.org>
This commit is contained in:
Sabyasachi Singh 2017-05-09 18:50:19 -07:00
parent 33a94f46e5
commit a43e9b1d23
1 changed files with 28 additions and 1 deletions
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29
kernel/sched/core_ctl.c
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@ -44,6 +44,7 @@ struct cluster_data {
bool pending;
spinlock_t pending_lock;
bool is_big_cluster;
bool enable;
int nrrun;
bool nrrun_changed;
struct task_struct *core_ctl_thread;
@ -244,6 +245,29 @@ 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);
@ -372,6 +396,7 @@ 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,
@ -381,6 +406,7 @@ 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,
@ -549,7 +575,7 @@ 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);
@ -1046,6 +1072,7 @@ 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);