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-rw-r--r--kernel/power/qos.c1
-rw-r--r--kernel/power/wakelock.c1
-rw-r--r--kernel/sched/cpufreq_schedutil.c262
-rw-r--r--kernel/trace/trace.c12
-rw-r--r--kernel/trace/trace.h11
-rw-r--r--kernel/trace/trace_events_trigger.c15
6 files changed, 208 insertions, 94 deletions
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index fa39092b7aea..86d72ffb811b 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -184,7 +184,6 @@ static inline void pm_qos_set_value(struct pm_qos_constraints *c, s32 value)
c->target_value = value;
}
-static inline int pm_qos_get_value(struct pm_qos_constraints *c);
static int pm_qos_dbg_show_requests(struct seq_file *s, void *unused)
{
struct pm_qos_object *qos = (struct pm_qos_object *)s->private;
diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c
index dfba59be190b..4210152e56f0 100644
--- a/kernel/power/wakelock.c
+++ b/kernel/power/wakelock.c
@@ -188,6 +188,7 @@ static struct wakelock *wakelock_lookup_add(const char *name, size_t len,
return ERR_PTR(-ENOMEM);
}
wl->ws.name = wl->name;
+ wl->ws.last_time = ktime_get();
wakeup_source_add(&wl->ws);
rb_link_node(&wl->node, parent, node);
rb_insert_color(&wl->node, &wakelocks_tree);
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index e13df951aca7..fd76497efeb1 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -51,7 +51,7 @@ struct sugov_cpu {
bool iowait_boost_pending;
unsigned int iowait_boost;
unsigned int iowait_boost_max;
- u64 last_update;
+ u64 last_update;
/* The fields below are only needed when sharing a policy: */
unsigned long util_cfs;
@@ -89,46 +89,52 @@ static bool sugov_should_update_freq(struct sugov_policy *sg_policy, u64 time)
* schedule the kthread.
*/
if (sg_policy->policy->fast_switch_enabled &&
- !cpufreq_can_do_remote_dvfs(sg_policy->policy))
+ !cpufreq_this_cpu_can_update(sg_policy->policy))
return false;
- if (sg_policy->work_in_progress)
- return false;
-
- if (unlikely(sg_policy->need_freq_update)) {
- sg_policy->need_freq_update = false;
- /*
- * This happens when limits change, so forget the previous
- * next_freq value and force an update.
- */
- sg_policy->next_freq = UINT_MAX;
+ if (unlikely(sg_policy->need_freq_update))
return true;
- }
delta_ns = time - sg_policy->last_freq_update_time;
return delta_ns >= sg_policy->freq_update_delay_ns;
}
-static void sugov_update_commit(struct sugov_policy *sg_policy, u64 time,
- unsigned int next_freq)
+static bool sugov_update_next_freq(struct sugov_policy *sg_policy, u64 time,
+ unsigned int next_freq)
{
- struct cpufreq_policy *policy = sg_policy->policy;
-
if (sg_policy->next_freq == next_freq)
- return;
+ return false;
sg_policy->next_freq = next_freq;
sg_policy->last_freq_update_time = time;
- if (policy->fast_switch_enabled) {
- next_freq = cpufreq_driver_fast_switch(policy, next_freq);
- if (!next_freq)
- return;
+ return true;
+}
- policy->cur = next_freq;
- trace_cpu_frequency(next_freq, smp_processor_id());
- } else {
+static void sugov_fast_switch(struct sugov_policy *sg_policy, u64 time,
+ unsigned int next_freq)
+{
+ struct cpufreq_policy *policy = sg_policy->policy;
+
+ if (!sugov_update_next_freq(sg_policy, time, next_freq))
+ return;
+
+ next_freq = cpufreq_driver_fast_switch(policy, next_freq);
+ if (!next_freq)
+ return;
+
+ policy->cur = next_freq;
+ trace_cpu_frequency(next_freq, smp_processor_id());
+}
+
+static void sugov_deferred_update(struct sugov_policy *sg_policy, u64 time,
+ unsigned int next_freq)
+{
+ if (!sugov_update_next_freq(sg_policy, time, next_freq))
+ return;
+
+ if (!sg_policy->work_in_progress) {
sg_policy->work_in_progress = true;
irq_work_queue(&sg_policy->irq_work);
}
@@ -165,8 +171,10 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy,
freq = (freq + (freq >> 2)) * util / max;
- if (freq == sg_policy->cached_raw_freq && sg_policy->next_freq != UINT_MAX)
+ if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update)
return sg_policy->next_freq;
+
+ sg_policy->need_freq_update = false;
sg_policy->cached_raw_freq = freq;
return cpufreq_driver_resolve_freq(policy, freq);
}
@@ -201,43 +209,120 @@ static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
return min(util, sg_cpu->max);
}
-static void sugov_set_iowait_boost(struct sugov_cpu *sg_cpu, u64 time, unsigned int flags)
+/**
+ * sugov_iowait_reset() - Reset the IO boost status of a CPU.
+ * @sg_cpu: the sugov data for the CPU to boost
+ * @time: the update time from the caller
+ * @set_iowait_boost: true if an IO boost has been requested
+ *
+ * The IO wait boost of a task is disabled after a tick since the last update
+ * of a CPU. If a new IO wait boost is requested after more then a tick, then
+ * we enable the boost starting from the minimum frequency, which improves
+ * energy efficiency by ignoring sporadic wakeups from IO.
+ */
+static bool sugov_iowait_reset(struct sugov_cpu *sg_cpu, u64 time,
+ bool set_iowait_boost)
{
- if (flags & SCHED_CPUFREQ_IOWAIT) {
- if (sg_cpu->iowait_boost_pending)
- return;
+ s64 delta_ns = time - sg_cpu->last_update;
- sg_cpu->iowait_boost_pending = true;
+ /* Reset boost only if a tick has elapsed since last request */
+ if (delta_ns <= TICK_NSEC)
+ return false;
- if (sg_cpu->iowait_boost) {
- sg_cpu->iowait_boost <<= 1;
- if (sg_cpu->iowait_boost > sg_cpu->iowait_boost_max)
- sg_cpu->iowait_boost = sg_cpu->iowait_boost_max;
- } else {
- sg_cpu->iowait_boost = sg_cpu->sg_policy->policy->min;
- }
- } else if (sg_cpu->iowait_boost) {
- s64 delta_ns = time - sg_cpu->last_update;
+ sg_cpu->iowait_boost = set_iowait_boost
+ ? sg_cpu->sg_policy->policy->min : 0;
+ sg_cpu->iowait_boost_pending = set_iowait_boost;
- /* Clear iowait_boost if the CPU apprears to have been idle. */
- if (delta_ns > TICK_NSEC) {
- sg_cpu->iowait_boost = 0;
- sg_cpu->iowait_boost_pending = false;
- }
+ return true;
+}
+
+/**
+ * sugov_iowait_boost() - Updates the IO boost status of a CPU.
+ * @sg_cpu: the sugov data for the CPU to boost
+ * @time: the update time from the caller
+ * @flags: SCHED_CPUFREQ_IOWAIT if the task is waking up after an IO wait
+ *
+ * Each time a task wakes up after an IO operation, the CPU utilization can be
+ * boosted to a certain utilization which doubles at each "frequent and
+ * successive" wakeup from IO, ranging from the utilization of the minimum
+ * OPP to the utilization of the maximum OPP.
+ * To keep doubling, an IO boost has to be requested at least once per tick,
+ * otherwise we restart from the utilization of the minimum OPP.
+ */
+static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, u64 time,
+ unsigned int flags)
+{
+ bool set_iowait_boost = flags & SCHED_CPUFREQ_IOWAIT;
+
+ /* Reset boost if the CPU appears to have been idle enough */
+ if (sg_cpu->iowait_boost &&
+ sugov_iowait_reset(sg_cpu, time, set_iowait_boost))
+ return;
+
+ /* Boost only tasks waking up after IO */
+ if (!set_iowait_boost)
+ return;
+
+ /* Ensure boost doubles only one time at each request */
+ if (sg_cpu->iowait_boost_pending)
+ return;
+ sg_cpu->iowait_boost_pending = true;
+
+ /* Double the boost at each request */
+ if (sg_cpu->iowait_boost) {
+ sg_cpu->iowait_boost <<= 1;
+ if (sg_cpu->iowait_boost > sg_cpu->iowait_boost_max)
+ sg_cpu->iowait_boost = sg_cpu->iowait_boost_max;
+ return;
}
+
+ /* First wakeup after IO: start with minimum boost */
+ sg_cpu->iowait_boost = sg_cpu->sg_policy->policy->min;
}
-static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, unsigned long *util,
- unsigned long *max)
+/**
+ * sugov_iowait_apply() - Apply the IO boost to a CPU.
+ * @sg_cpu: the sugov data for the cpu to boost
+ * @time: the update time from the caller
+ * @util: the utilization to (eventually) boost
+ * @max: the maximum value the utilization can be boosted to
+ *
+ * A CPU running a task which woken up after an IO operation can have its
+ * utilization boosted to speed up the completion of those IO operations.
+ * The IO boost value is increased each time a task wakes up from IO, in
+ * sugov_iowait_apply(), and it's instead decreased by this function,
+ * each time an increase has not been requested (!iowait_boost_pending).
+ *
+ * A CPU which also appears to have been idle for at least one tick has also
+ * its IO boost utilization reset.
+ *
+ * This mechanism is designed to boost high frequently IO waiting tasks, while
+ * being more conservative on tasks which does sporadic IO operations.
+ */
+static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time,
+ unsigned long *util, unsigned long *max)
{
unsigned int boost_util, boost_max;
+ /* No boost currently required */
if (!sg_cpu->iowait_boost)
return;
+ /* Reset boost if the CPU appears to have been idle enough */
+ if (sugov_iowait_reset(sg_cpu, time, false))
+ return;
+
+ /*
+ * An IO waiting task has just woken up:
+ * allow to further double the boost value
+ */
if (sg_cpu->iowait_boost_pending) {
sg_cpu->iowait_boost_pending = false;
} else {
+ /*
+ * Otherwise: reduce the boost value and disable it when we
+ * reach the minimum.
+ */
sg_cpu->iowait_boost >>= 1;
if (sg_cpu->iowait_boost < sg_cpu->sg_policy->policy->min) {
sg_cpu->iowait_boost = 0;
@@ -245,9 +330,12 @@ static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, unsigned long *util,
}
}
+ /*
+ * Apply the current boost value: a CPU is boosted only if its current
+ * utilization is smaller then the current IO boost level.
+ */
boost_util = sg_cpu->iowait_boost;
boost_max = sg_cpu->iowait_boost_max;
-
if (*util * boost_max < *max * boost_util) {
*util = boost_util;
*max = boost_max;
@@ -286,7 +374,7 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
unsigned int next_f;
bool busy;
- sugov_set_iowait_boost(sg_cpu, time, flags);
+ sugov_iowait_boost(sg_cpu, time, flags);
sg_cpu->last_update = time;
ignore_dl_rate_limit(sg_cpu, sg_policy);
@@ -299,21 +387,31 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
sugov_get_util(sg_cpu);
max = sg_cpu->max;
util = sugov_aggregate_util(sg_cpu);
- sugov_iowait_boost(sg_cpu, &util, &max);
+ sugov_iowait_apply(sg_cpu, time, &util, &max);
next_f = get_next_freq(sg_policy, util, max);
/*
* Do not reduce the frequency if the CPU has not been idle
* recently, as the reduction is likely to be premature then.
*/
- if (busy && next_f < sg_policy->next_freq &&
- sg_policy->next_freq != UINT_MAX) {
+ if (busy && next_f < sg_policy->next_freq) {
next_f = sg_policy->next_freq;
/* Reset cached freq as next_freq has changed */
sg_policy->cached_raw_freq = 0;
}
- sugov_update_commit(sg_policy, time, next_f);
+ /*
+ * This code runs under rq->lock for the target CPU, so it won't run
+ * concurrently on two different CPUs for the same target and it is not
+ * necessary to acquire the lock in the fast switch case.
+ */
+ if (sg_policy->policy->fast_switch_enabled) {
+ sugov_fast_switch(sg_policy, time, next_f);
+ } else {
+ raw_spin_lock(&sg_policy->update_lock);
+ sugov_deferred_update(sg_policy, time, next_f);
+ raw_spin_unlock(&sg_policy->update_lock);
+ }
}
static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
@@ -326,28 +424,12 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
for_each_cpu(j, policy->cpus) {
struct sugov_cpu *j_sg_cpu = &per_cpu(sugov_cpu, j);
unsigned long j_util, j_max;
- s64 delta_ns;
sugov_get_util(j_sg_cpu);
-
- /*
- * If the CFS CPU utilization was last updated before the
- * previous frequency update and the time elapsed between the
- * last update of the CPU utilization and the last frequency
- * update is long enough, reset iowait_boost and util_cfs, as
- * they are now probably stale. However, still consider the
- * CPU contribution if it has some DEADLINE utilization
- * (util_dl).
- */
- delta_ns = time - j_sg_cpu->last_update;
- if (delta_ns > TICK_NSEC) {
- j_sg_cpu->iowait_boost = 0;
- j_sg_cpu->iowait_boost_pending = false;
- }
-
j_max = j_sg_cpu->max;
j_util = sugov_aggregate_util(j_sg_cpu);
- sugov_iowait_boost(j_sg_cpu, &j_util, &j_max);
+ sugov_iowait_apply(j_sg_cpu, time, &j_util, &j_max);
+
if (j_util * max > j_max * util) {
util = j_util;
max = j_max;
@@ -366,14 +448,18 @@ sugov_update_shared(struct update_util_data *hook, u64 time, unsigned int flags)
raw_spin_lock(&sg_policy->update_lock);
- sugov_set_iowait_boost(sg_cpu, time, flags);
+ sugov_iowait_boost(sg_cpu, time, flags);
sg_cpu->last_update = time;
ignore_dl_rate_limit(sg_cpu, sg_policy);
if (sugov_should_update_freq(sg_policy, time)) {
next_f = sugov_next_freq_shared(sg_cpu, time);
- sugov_update_commit(sg_policy, time, next_f);
+
+ if (sg_policy->policy->fast_switch_enabled)
+ sugov_fast_switch(sg_policy, time, next_f);
+ else
+ sugov_deferred_update(sg_policy, time, next_f);
}
raw_spin_unlock(&sg_policy->update_lock);
@@ -382,13 +468,27 @@ sugov_update_shared(struct update_util_data *hook, u64 time, unsigned int flags)
static void sugov_work(struct kthread_work *work)
{
struct sugov_policy *sg_policy = container_of(work, struct sugov_policy, work);
+ unsigned int freq;
+ unsigned long flags;
+
+ /*
+ * Hold sg_policy->update_lock shortly to handle the case where:
+ * incase sg_policy->next_freq is read here, and then updated by
+ * sugov_deferred_update() just before work_in_progress is set to false
+ * here, we may miss queueing the new update.
+ *
+ * Note: If a work was queued after the update_lock is released,
+ * sugov_work() will just be called again by kthread_work code; and the
+ * request will be proceed before the sugov thread sleeps.
+ */
+ raw_spin_lock_irqsave(&sg_policy->update_lock, flags);
+ freq = sg_policy->next_freq;
+ sg_policy->work_in_progress = false;
+ raw_spin_unlock_irqrestore(&sg_policy->update_lock, flags);
mutex_lock(&sg_policy->work_lock);
- __cpufreq_driver_target(sg_policy->policy, sg_policy->next_freq,
- CPUFREQ_RELATION_L);
+ __cpufreq_driver_target(sg_policy->policy, freq, CPUFREQ_RELATION_L);
mutex_unlock(&sg_policy->work_lock);
-
- sg_policy->work_in_progress = false;
}
static void sugov_irq_work(struct irq_work *irq_work)
@@ -511,11 +611,7 @@ static int sugov_kthread_create(struct sugov_policy *sg_policy)
}
sg_policy->thread = thread;
-
- /* Kthread is bound to all CPUs by default */
- if (!policy->dvfs_possible_from_any_cpu)
- kthread_bind_mask(thread, policy->related_cpus);
-
+ kthread_bind_mask(thread, policy->related_cpus);
init_irq_work(&sg_policy->irq_work, sugov_irq_work);
mutex_init(&sg_policy->work_lock);
@@ -658,7 +754,7 @@ static int sugov_start(struct cpufreq_policy *policy)
sg_policy->freq_update_delay_ns = sg_policy->tunables->rate_limit_us * NSEC_PER_USEC;
sg_policy->last_freq_update_time = 0;
- sg_policy->next_freq = UINT_MAX;
+ sg_policy->next_freq = 0;
sg_policy->work_in_progress = false;
sg_policy->need_freq_update = false;
sg_policy->cached_raw_freq = 0;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 414d7210b2ec..bcd93031d042 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -893,7 +893,7 @@ int __trace_bputs(unsigned long ip, const char *str)
EXPORT_SYMBOL_GPL(__trace_bputs);
#ifdef CONFIG_TRACER_SNAPSHOT
-static void tracing_snapshot_instance(struct trace_array *tr)
+void tracing_snapshot_instance(struct trace_array *tr)
{
struct tracer *tracer = tr->current_trace;
unsigned long flags;
@@ -949,7 +949,7 @@ static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
struct trace_buffer *size_buf, int cpu_id);
static void set_buffer_entries(struct trace_buffer *buf, unsigned long val);
-static int alloc_snapshot(struct trace_array *tr)
+int tracing_alloc_snapshot_instance(struct trace_array *tr)
{
int ret;
@@ -995,7 +995,7 @@ int tracing_alloc_snapshot(void)
struct trace_array *tr = &global_trace;
int ret;
- ret = alloc_snapshot(tr);
+ ret = tracing_alloc_snapshot_instance(tr);
WARN_ON(ret < 0);
return ret;
@@ -5408,7 +5408,7 @@ static int tracing_set_tracer(struct trace_array *tr, const char *buf)
#ifdef CONFIG_TRACER_MAX_TRACE
if (t->use_max_tr && !had_max_tr) {
- ret = alloc_snapshot(tr);
+ ret = tracing_alloc_snapshot_instance(tr);
if (ret < 0)
goto out;
}
@@ -6451,7 +6451,7 @@ tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt,
}
#endif
if (!tr->allocated_snapshot) {
- ret = alloc_snapshot(tr);
+ ret = tracing_alloc_snapshot_instance(tr);
if (ret < 0)
break;
}
@@ -7179,7 +7179,7 @@ ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash,
return ret;
out_reg:
- ret = alloc_snapshot(tr);
+ ret = tracing_alloc_snapshot_instance(tr);
if (ret < 0)
goto out;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 6fb46a06c9dc..507954b4e058 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1817,6 +1817,17 @@ static inline void __init trace_event_init(void) { }
static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
#endif
+#ifdef CONFIG_TRACER_SNAPSHOT
+void tracing_snapshot_instance(struct trace_array *tr);
+int tracing_alloc_snapshot_instance(struct trace_array *tr);
+#else
+static inline void tracing_snapshot_instance(struct trace_array *tr) { }
+static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
+{
+ return 0;
+}
+#endif
+
extern struct trace_iterator *tracepoint_print_iter;
#endif /* _LINUX_KERNEL_TRACE_H */
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index d251cabcf69a..8b5bdcf64871 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -483,9 +483,10 @@ clear_event_triggers(struct trace_array *tr)
struct trace_event_file *file;
list_for_each_entry(file, &tr->events, list) {
- struct event_trigger_data *data;
- list_for_each_entry_rcu(data, &file->triggers, list) {
+ struct event_trigger_data *data, *n;
+ list_for_each_entry_safe(data, n, &file->triggers, list) {
trace_event_trigger_enable_disable(file, 0);
+ list_del_rcu(&data->list);
if (data->ops->free)
data->ops->free(data->ops, data);
}
@@ -642,6 +643,7 @@ event_trigger_callback(struct event_command *cmd_ops,
trigger_data->count = -1;
trigger_data->ops = trigger_ops;
trigger_data->cmd_ops = cmd_ops;
+ trigger_data->private_data = file;
INIT_LIST_HEAD(&trigger_data->list);
INIT_LIST_HEAD(&trigger_data->named_list);
@@ -1053,7 +1055,12 @@ static void
snapshot_trigger(struct event_trigger_data *data, void *rec,
struct ring_buffer_event *event)
{
- tracing_snapshot();
+ struct trace_event_file *file = data->private_data;
+
+ if (file)
+ tracing_snapshot_instance(file->tr);
+ else
+ tracing_snapshot();
}
static void
@@ -1076,7 +1083,7 @@ register_snapshot_trigger(char *glob, struct event_trigger_ops *ops,
{
int ret = register_trigger(glob, ops, data, file);
- if (ret > 0 && tracing_alloc_snapshot() != 0) {
+ if (ret > 0 && tracing_alloc_snapshot_instance(file->tr) != 0) {
unregister_trigger(glob, ops, data, file);
ret = 0;
}