sched: Use an accessor to read the rq clock
Read the runqueue clock through an accessor. This
prepares for adding a debugging infrastructure to
detect missing or redundant calls to update_rq_clock()
between a scheduler's entry and exit point.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Turner <pjt@google.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1365724262-20142-6-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 46d0017..36f85be 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -667,7 +667,7 @@
{
s64 period = sched_avg_period();
- while ((s64)(rq->clock - rq->age_stamp) > period) {
+ while ((s64)(rq_clock(rq) - rq->age_stamp) > period) {
/*
* Inline assembly required to prevent the compiler
* optimising this loop into a divmod call.
@@ -1328,7 +1328,7 @@
p->sched_class->task_woken(rq, p);
if (rq->idle_stamp) {
- u64 delta = rq->clock - rq->idle_stamp;
+ u64 delta = rq_clock(rq) - rq->idle_stamp;
u64 max = 2*sysctl_sched_migration_cost;
if (delta > max)
@@ -2106,7 +2106,7 @@
if (task_current(rq, p)) {
update_rq_clock(rq);
- ns = rq->clock_task - p->se.exec_start;
+ ns = rq_clock_task(rq) - p->se.exec_start;
if ((s64)ns < 0)
ns = 0;
}
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1c8762a..3ee1c2e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -704,7 +704,7 @@
static void update_curr(struct cfs_rq *cfs_rq)
{
struct sched_entity *curr = cfs_rq->curr;
- u64 now = rq_of(cfs_rq)->clock_task;
+ u64 now = rq_clock_task(rq_of(cfs_rq));
unsigned long delta_exec;
if (unlikely(!curr))
@@ -736,7 +736,7 @@
static inline void
update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- schedstat_set(se->statistics.wait_start, rq_of(cfs_rq)->clock);
+ schedstat_set(se->statistics.wait_start, rq_clock(rq_of(cfs_rq)));
}
/*
@@ -756,14 +756,14 @@
update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
schedstat_set(se->statistics.wait_max, max(se->statistics.wait_max,
- rq_of(cfs_rq)->clock - se->statistics.wait_start));
+ rq_clock(rq_of(cfs_rq)) - se->statistics.wait_start));
schedstat_set(se->statistics.wait_count, se->statistics.wait_count + 1);
schedstat_set(se->statistics.wait_sum, se->statistics.wait_sum +
- rq_of(cfs_rq)->clock - se->statistics.wait_start);
+ rq_clock(rq_of(cfs_rq)) - se->statistics.wait_start);
#ifdef CONFIG_SCHEDSTATS
if (entity_is_task(se)) {
trace_sched_stat_wait(task_of(se),
- rq_of(cfs_rq)->clock - se->statistics.wait_start);
+ rq_clock(rq_of(cfs_rq)) - se->statistics.wait_start);
}
#endif
schedstat_set(se->statistics.wait_start, 0);
@@ -789,7 +789,7 @@
/*
* We are starting a new run period:
*/
- se->exec_start = rq_of(cfs_rq)->clock_task;
+ se->exec_start = rq_clock_task(rq_of(cfs_rq));
}
/**************************************************
@@ -1515,7 +1515,7 @@
static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
{
- __update_entity_runnable_avg(rq->clock_task, &rq->avg, runnable);
+ __update_entity_runnable_avg(rq_clock_task(rq), &rq->avg, runnable);
__update_tg_runnable_avg(&rq->avg, &rq->cfs);
}
@@ -1530,7 +1530,7 @@
* accumulated while sleeping.
*/
if (unlikely(se->avg.decay_count <= 0)) {
- se->avg.last_runnable_update = rq_of(cfs_rq)->clock_task;
+ se->avg.last_runnable_update = rq_clock_task(rq_of(cfs_rq));
if (se->avg.decay_count) {
/*
* In a wake-up migration we have to approximate the
@@ -1625,7 +1625,7 @@
tsk = task_of(se);
if (se->statistics.sleep_start) {
- u64 delta = rq_of(cfs_rq)->clock - se->statistics.sleep_start;
+ u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.sleep_start;
if ((s64)delta < 0)
delta = 0;
@@ -1642,7 +1642,7 @@
}
}
if (se->statistics.block_start) {
- u64 delta = rq_of(cfs_rq)->clock - se->statistics.block_start;
+ u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.block_start;
if ((s64)delta < 0)
delta = 0;
@@ -1823,9 +1823,9 @@
struct task_struct *tsk = task_of(se);
if (tsk->state & TASK_INTERRUPTIBLE)
- se->statistics.sleep_start = rq_of(cfs_rq)->clock;
+ se->statistics.sleep_start = rq_clock(rq_of(cfs_rq));
if (tsk->state & TASK_UNINTERRUPTIBLE)
- se->statistics.block_start = rq_of(cfs_rq)->clock;
+ se->statistics.block_start = rq_clock(rq_of(cfs_rq));
}
#endif
}
@@ -2100,7 +2100,7 @@
if (unlikely(cfs_rq->throttle_count))
return cfs_rq->throttled_clock_task;
- return rq_of(cfs_rq)->clock_task - cfs_rq->throttled_clock_task_time;
+ return rq_clock_task(rq_of(cfs_rq)) - cfs_rq->throttled_clock_task_time;
}
/* returns 0 on failure to allocate runtime */
@@ -2159,7 +2159,7 @@
struct rq *rq = rq_of(cfs_rq);
/* if the deadline is ahead of our clock, nothing to do */
- if (likely((s64)(rq->clock - cfs_rq->runtime_expires) < 0))
+ if (likely((s64)(rq_clock(rq_of(cfs_rq)) - cfs_rq->runtime_expires) < 0))
return;
if (cfs_rq->runtime_remaining < 0)
@@ -2248,7 +2248,7 @@
#ifdef CONFIG_SMP
if (!cfs_rq->throttle_count) {
/* adjust cfs_rq_clock_task() */
- cfs_rq->throttled_clock_task_time += rq->clock_task -
+ cfs_rq->throttled_clock_task_time += rq_clock_task(rq) -
cfs_rq->throttled_clock_task;
}
#endif
@@ -2263,7 +2263,7 @@
/* group is entering throttled state, stop time */
if (!cfs_rq->throttle_count)
- cfs_rq->throttled_clock_task = rq->clock_task;
+ cfs_rq->throttled_clock_task = rq_clock_task(rq);
cfs_rq->throttle_count++;
return 0;
@@ -2302,7 +2302,7 @@
rq->nr_running -= task_delta;
cfs_rq->throttled = 1;
- cfs_rq->throttled_clock = rq->clock;
+ cfs_rq->throttled_clock = rq_clock(rq);
raw_spin_lock(&cfs_b->lock);
list_add_tail_rcu(&cfs_rq->throttled_list, &cfs_b->throttled_cfs_rq);
raw_spin_unlock(&cfs_b->lock);
@@ -2323,7 +2323,7 @@
update_rq_clock(rq);
raw_spin_lock(&cfs_b->lock);
- cfs_b->throttled_time += rq->clock - cfs_rq->throttled_clock;
+ cfs_b->throttled_time += rq_clock(rq) - cfs_rq->throttled_clock;
list_del_rcu(&cfs_rq->throttled_list);
raw_spin_unlock(&cfs_b->lock);
@@ -2726,7 +2726,7 @@
#else /* CONFIG_CFS_BANDWIDTH */
static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
{
- return rq_of(cfs_rq)->clock_task;
+ return rq_clock_task(rq_of(cfs_rq));
}
static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq,
@@ -3966,7 +3966,7 @@
* 2) too many balance attempts have failed.
*/
- tsk_cache_hot = task_hot(p, env->src_rq->clock_task, env->sd);
+ tsk_cache_hot = task_hot(p, rq_clock_task(env->src_rq), env->sd);
if (!tsk_cache_hot ||
env->sd->nr_balance_failed > env->sd->cache_nice_tries) {
@@ -4322,7 +4322,7 @@
age_stamp = ACCESS_ONCE(rq->age_stamp);
avg = ACCESS_ONCE(rq->rt_avg);
- total = sched_avg_period() + (rq->clock - age_stamp);
+ total = sched_avg_period() + (rq_clock(rq) - age_stamp);
if (unlikely(total < avg)) {
/* Ensures that power won't end up being negative */
@@ -5261,7 +5261,7 @@
int pulled_task = 0;
unsigned long next_balance = jiffies + HZ;
- this_rq->idle_stamp = this_rq->clock;
+ this_rq->idle_stamp = rq_clock(this_rq);
if (this_rq->avg_idle < sysctl_sched_migration_cost)
return;
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 8853ab1..8d85f9a 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -886,7 +886,7 @@
if (curr->sched_class != &rt_sched_class)
return;
- delta_exec = rq->clock_task - curr->se.exec_start;
+ delta_exec = rq_clock_task(rq) - curr->se.exec_start;
if (unlikely((s64)delta_exec <= 0))
return;
@@ -896,7 +896,7 @@
curr->se.sum_exec_runtime += delta_exec;
account_group_exec_runtime(curr, delta_exec);
- curr->se.exec_start = rq->clock_task;
+ curr->se.exec_start = rq_clock_task(rq);
cpuacct_charge(curr, delta_exec);
sched_rt_avg_update(rq, delta_exec);
@@ -1345,7 +1345,7 @@
} while (rt_rq);
p = rt_task_of(rt_se);
- p->se.exec_start = rq->clock_task;
+ p->se.exec_start = rq_clock_task(rq);
return p;
}
@@ -1997,7 +1997,7 @@
{
struct task_struct *p = rq->curr;
- p->se.exec_start = rq->clock_task;
+ p->se.exec_start = rq_clock_task(rq);
/* The running task is never eligible for pushing */
dequeue_pushable_task(rq, p);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c806c61..74ff659 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -548,6 +548,16 @@
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
#define raw_rq() (&__raw_get_cpu_var(runqueues))
+static inline u64 rq_clock(struct rq *rq)
+{
+ return rq->clock;
+}
+
+static inline u64 rq_clock_task(struct rq *rq)
+{
+ return rq->clock_task;
+}
+
#ifdef CONFIG_SMP
#define rcu_dereference_check_sched_domain(p) \
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 2ef90a5..17d7065 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -61,7 +61,7 @@
*/
static inline void sched_info_dequeued(struct task_struct *t)
{
- unsigned long long now = task_rq(t)->clock, delta = 0;
+ unsigned long long now = rq_clock(task_rq(t)), delta = 0;
if (unlikely(sched_info_on()))
if (t->sched_info.last_queued)
@@ -79,7 +79,7 @@
*/
static void sched_info_arrive(struct task_struct *t)
{
- unsigned long long now = task_rq(t)->clock, delta = 0;
+ unsigned long long now = rq_clock(task_rq(t)), delta = 0;
if (t->sched_info.last_queued)
delta = now - t->sched_info.last_queued;
@@ -100,7 +100,7 @@
{
if (unlikely(sched_info_on()))
if (!t->sched_info.last_queued)
- t->sched_info.last_queued = task_rq(t)->clock;
+ t->sched_info.last_queued = rq_clock(task_rq(t));
}
/*
@@ -112,7 +112,7 @@
*/
static inline void sched_info_depart(struct task_struct *t)
{
- unsigned long long delta = task_rq(t)->clock -
+ unsigned long long delta = rq_clock(task_rq(t)) -
t->sched_info.last_arrival;
rq_sched_info_depart(task_rq(t), delta);
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index da5eb5b..e08fbee 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -28,7 +28,7 @@
struct task_struct *stop = rq->stop;
if (stop && stop->on_rq) {
- stop->se.exec_start = rq->clock_task;
+ stop->se.exec_start = rq_clock_task(rq);
return stop;
}
@@ -57,7 +57,7 @@
struct task_struct *curr = rq->curr;
u64 delta_exec;
- delta_exec = rq->clock_task - curr->se.exec_start;
+ delta_exec = rq_clock_task(rq) - curr->se.exec_start;
if (unlikely((s64)delta_exec < 0))
delta_exec = 0;
@@ -67,7 +67,7 @@
curr->se.sum_exec_runtime += delta_exec;
account_group_exec_runtime(curr, delta_exec);
- curr->se.exec_start = rq->clock_task;
+ curr->se.exec_start = rq_clock_task(rq);
cpuacct_charge(curr, delta_exec);
}
@@ -79,7 +79,7 @@
{
struct task_struct *stop = rq->stop;
- stop->se.exec_start = rq->clock_task;
+ stop->se.exec_start = rq_clock_task(rq);
}
static void switched_to_stop(struct rq *rq, struct task_struct *p)
