unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
- if (uaccess_kernel()) {
- memcpy(to, (__force void*)from, n);
- return 0;
- }
-
return buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to);
}
EXPORT_SYMBOL(raw_copy_from_user);
unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
- if (uaccess_kernel()) {
- memcpy((__force void *) to, from, n);
- return 0;
- }
-
return buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from);
}
EXPORT_SYMBOL(raw_copy_to_user);
if (!access_ok(src, 1))
return -EFAULT;
-
- if (uaccess_kernel()) {
- strncpy(dst, (__force void *) src, count);
- return strnlen(dst, count);
- }
-
n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
&ptr);
if (n != 0)
unsigned long __clear_user(void __user *mem, unsigned long len)
{
- if (uaccess_kernel()) {
- memset((__force void*)mem, 0, len);
- return 0;
- }
-
return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);
}
EXPORT_SYMBOL(__clear_user);
if (!access_ok(str, 1))
return -EFAULT;
-
- if (uaccess_kernel())
- return strnlen((__force char*)str, len) + 1;
-
n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
if (n == 0)
return count + 1;
* 0 - On success
* -EFAULT - User access resulted in a page fault
* -EAGAIN - Atomic operation was unable to complete due to contention
- * -ENOSYS - Function not implemented (only if !HAVE_FUTEX_CMPXCHG)
*/
int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
return false;
/* flip prio, so high prio is leftmost */
- if (prio_less(b, a, task_rq(a)->core->core_forceidle))
+ if (prio_less(b, a, !!task_rq(a)->core->core_forceidle_count))
return true;
return false;
rb_add(&p->core_node, &rq->core_tree, rb_sched_core_less);
}
-void sched_core_dequeue(struct rq *rq, struct task_struct *p)
+void sched_core_dequeue(struct rq *rq, struct task_struct *p, int flags)
{
rq->core->core_task_seq++;
- if (!sched_core_enqueued(p))
- return;
+ if (sched_core_enqueued(p)) {
+ rb_erase(&p->core_node, &rq->core_tree);
+ RB_CLEAR_NODE(&p->core_node);
+ }
- rb_erase(&p->core_node, &rq->core_tree);
- RB_CLEAR_NODE(&p->core_node);
+ /*
+ * Migrating the last task off the cpu, with the cpu in forced idle
+ * state. Reschedule to create an accounting edge for forced idle,
+ * and re-examine whether the core is still in forced idle state.
+ */
+ if (!(flags & DEQUEUE_SAVE) && rq->nr_running == 1 &&
+ rq->core->core_forceidle_count && rq->curr == rq->idle)
+ resched_curr(rq);
}
/*
for_each_cpu(t, smt_mask)
cpu_rq(t)->core_enabled = enabled;
+ cpu_rq(cpu)->core->core_forceidle_start = 0;
+
sched_core_unlock(cpu, &flags);
cpumask_andnot(&sched_core_mask, &sched_core_mask, smt_mask);
#else /* !CONFIG_SCHED_CORE */
static inline void sched_core_enqueue(struct rq *rq, struct task_struct *p) { }
-static inline void sched_core_dequeue(struct rq *rq, struct task_struct *p) { }
+static inline void
+sched_core_dequeue(struct rq *rq, struct task_struct *p, int flags) { }
#endif /* CONFIG_SCHED_CORE */
static inline void dequeue_task(struct rq *rq, struct task_struct *p, int flags)
{
if (sched_core_enabled(rq))
- sched_core_dequeue(rq, p);
+ sched_core_dequeue(rq, p, flags);
if (!(flags & DEQUEUE_NOCLOCK))
update_rq_clock(rq);
return;
}
+ if (WARN_ON_ONCE(!p->migration_disabled))
+ return;
+
/*
* Ensure stop_task runs either before or after this, and that
* __set_cpus_allowed_ptr(SCA_MIGRATE_ENABLE) doesn't schedule().
if (sched_feat(LATENCY_WARN))
resched_latency = cpu_resched_latency(rq);
calc_global_load_tick(rq);
+ sched_core_tick(rq);
rq_unlock(rq, &rf);
struct task_struct *next, *p, *max = NULL;
const struct cpumask *smt_mask;
bool fi_before = false;
+ bool core_clock_updated = (rq == rq->core);
unsigned long cookie;
int i, cpu, occ = 0;
struct rq *rq_i;
/* reset state */
rq->core->core_cookie = 0UL;
- if (rq->core->core_forceidle) {
+ if (rq->core->core_forceidle_count) {
+ if (!core_clock_updated) {
+ update_rq_clock(rq->core);
+ core_clock_updated = true;
+ }
+ sched_core_account_forceidle(rq);
+ /* reset after accounting force idle */
+ rq->core->core_forceidle_start = 0;
+ rq->core->core_forceidle_count = 0;
+ rq->core->core_forceidle_occupation = 0;
need_sync = true;
fi_before = true;
- rq->core->core_forceidle = false;
}
/*
for_each_cpu_wrap(i, smt_mask, cpu) {
rq_i = cpu_rq(i);
- if (i != cpu)
+ /*
+ * Current cpu always has its clock updated on entrance to
+ * pick_next_task(). If the current cpu is not the core,
+ * the core may also have been updated above.
+ */
+ if (i != cpu && (rq_i != rq->core || !core_clock_updated))
update_rq_clock(rq_i);
p = rq_i->core_pick = pick_task(rq_i);
if (p == rq_i->idle) {
if (rq_i->nr_running) {
- rq->core->core_forceidle = true;
+ rq->core->core_forceidle_count++;
if (!fi_before)
rq->core->core_forceidle_seq++;
}
}
}
+ if (schedstat_enabled() && rq->core->core_forceidle_count) {
+ if (cookie)
+ rq->core->core_forceidle_start = rq_clock(rq->core);
+ rq->core->core_forceidle_occupation = occ;
+ }
+
rq->core->core_pick_seq = rq->core->core_task_seq;
next = rq->core_pick;
rq->core_sched_seq = rq->core->core_pick_seq;
* 1 0 1
* 1 1 0
*/
- if (!(fi_before && rq->core->core_forceidle))
- task_vruntime_update(rq_i, rq_i->core_pick, rq->core->core_forceidle);
+ if (!(fi_before && rq->core->core_forceidle_count))
+ task_vruntime_update(rq_i, rq_i->core_pick, !!rq->core->core_forceidle_count);
rq_i->core_pick->core_occupation = occ;
goto unlock;
/* copy the shared state to the new leader */
- core_rq->core_task_seq = rq->core_task_seq;
- core_rq->core_pick_seq = rq->core_pick_seq;
- core_rq->core_cookie = rq->core_cookie;
- core_rq->core_forceidle = rq->core_forceidle;
- core_rq->core_forceidle_seq = rq->core_forceidle_seq;
+ core_rq->core_task_seq = rq->core_task_seq;
+ core_rq->core_pick_seq = rq->core_pick_seq;
+ core_rq->core_cookie = rq->core_cookie;
+ core_rq->core_forceidle_count = rq->core_forceidle_count;
+ core_rq->core_forceidle_seq = rq->core_forceidle_seq;
+ core_rq->core_forceidle_occupation = rq->core_forceidle_occupation;
+
+ /*
+ * Accounting edge for forced idle is handled in pick_next_task().
+ * Don't need another one here, since the hotplug thread shouldn't
+ * have a cookie.
+ */
+ core_rq->core_forceidle_start = 0;
/* install new leader */
for_each_cpu(t, smt_mask) {
unsigned long sched_cpu_util(int cpu, unsigned long max)
{
- return effective_cpu_util(cpu, cpu_util_cfs(cpu_rq(cpu)), max,
+ return effective_cpu_util(cpu, cpu_util_cfs(cpu), max,
ENERGY_UTIL, NULL);
}
#endif /* CONFIG_SMP */
rcu_read_unlock();
pr_cont(" stack:%5lu pid:%5d ppid:%6d flags:0x%08lx\n",
free, task_pid_nr(p), ppid,
- (unsigned long)task_thread_info(p)->flags);
+ read_task_thread_flags(p));
print_worker_info(KERN_INFO, p);
print_stop_info(KERN_INFO, p);
rq->core_pick = NULL;
rq->core_enabled = 0;
rq->core_tree = RB_ROOT;
- rq->core_forceidle = false;
+ rq->core_forceidle_count = 0;
+ rq->core_forceidle_occupation = 0;
+ rq->core_forceidle_start = 0;
rq->core_cookie = 0UL;
#endif
projects / linux.git / commitdiff