Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar:
 "Misc fixes: various scheduler metrics corner case fixes, a
  sched_features deadlock fix, and a topology fix for certain NUMA
  systems"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Fix kernel-doc notation warning
  sched/fair: Fix load_balance redo for !imbalance
  sched/fair: Fix scale_rt_capacity() for SMT
  sched/fair: Fix vruntime_normalized() for remote non-migration wakeup
  sched/pelt: Fix update_blocked_averages() for RT and DL classes
  sched/topology: Set correct NUMA topology type
  sched/debug: Fix potential deadlock when writing to sched_features
This commit is contained in:
Linus Torvalds 2018-09-15 08:00:37 -10:00
commit 4314daa55b
3 changed files with 22 additions and 15 deletions

View File

@ -89,12 +89,12 @@ struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
static void sched_feat_disable(int i)
{
static_key_disable(&sched_feat_keys[i]);
static_key_disable_cpuslocked(&sched_feat_keys[i]);
}
static void sched_feat_enable(int i)
{
static_key_enable(&sched_feat_keys[i]);
static_key_enable_cpuslocked(&sched_feat_keys[i]);
}
#else
static void sched_feat_disable(int i) { };
@ -146,9 +146,11 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
/* Ensure the static_key remains in a consistent state */
inode = file_inode(filp);
cpus_read_lock();
inode_lock(inode);
ret = sched_feat_set(cmp);
inode_unlock(inode);
cpus_read_unlock();
if (ret < 0)
return ret;

View File

@ -3362,6 +3362,7 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
* attach_entity_load_avg - attach this entity to its cfs_rq load avg
* @cfs_rq: cfs_rq to attach to
* @se: sched_entity to attach
* @flags: migration hints
*
* Must call update_cfs_rq_load_avg() before this, since we rely on
* cfs_rq->avg.last_update_time being current.
@ -7263,6 +7264,7 @@ static void update_blocked_averages(int cpu)
{
struct rq *rq = cpu_rq(cpu);
struct cfs_rq *cfs_rq, *pos;
const struct sched_class *curr_class;
struct rq_flags rf;
bool done = true;
@ -7299,8 +7301,10 @@ static void update_blocked_averages(int cpu)
if (cfs_rq_has_blocked(cfs_rq))
done = false;
}
update_rt_rq_load_avg(rq_clock_task(rq), rq, 0);
update_dl_rq_load_avg(rq_clock_task(rq), rq, 0);
curr_class = rq->curr->sched_class;
update_rt_rq_load_avg(rq_clock_task(rq), rq, curr_class == &rt_sched_class);
update_dl_rq_load_avg(rq_clock_task(rq), rq, curr_class == &dl_sched_class);
update_irq_load_avg(rq, 0);
/* Don't need periodic decay once load/util_avg are null */
if (others_have_blocked(rq))
@ -7365,13 +7369,16 @@ static inline void update_blocked_averages(int cpu)
{
struct rq *rq = cpu_rq(cpu);
struct cfs_rq *cfs_rq = &rq->cfs;
const struct sched_class *curr_class;
struct rq_flags rf;
rq_lock_irqsave(rq, &rf);
update_rq_clock(rq);
update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq);
update_rt_rq_load_avg(rq_clock_task(rq), rq, 0);
update_dl_rq_load_avg(rq_clock_task(rq), rq, 0);
curr_class = rq->curr->sched_class;
update_rt_rq_load_avg(rq_clock_task(rq), rq, curr_class == &rt_sched_class);
update_dl_rq_load_avg(rq_clock_task(rq), rq, curr_class == &dl_sched_class);
update_irq_load_avg(rq, 0);
#ifdef CONFIG_NO_HZ_COMMON
rq->last_blocked_load_update_tick = jiffies;
@ -7482,10 +7489,10 @@ static inline int get_sd_load_idx(struct sched_domain *sd,
return load_idx;
}
static unsigned long scale_rt_capacity(int cpu)
static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
{
struct rq *rq = cpu_rq(cpu);
unsigned long max = arch_scale_cpu_capacity(NULL, cpu);
unsigned long max = arch_scale_cpu_capacity(sd, cpu);
unsigned long used, free;
unsigned long irq;
@ -7507,7 +7514,7 @@ static unsigned long scale_rt_capacity(int cpu)
static void update_cpu_capacity(struct sched_domain *sd, int cpu)
{
unsigned long capacity = scale_rt_capacity(cpu);
unsigned long capacity = scale_rt_capacity(sd, cpu);
struct sched_group *sdg = sd->groups;
cpu_rq(cpu)->cpu_capacity_orig = arch_scale_cpu_capacity(sd, cpu);
@ -8269,7 +8276,7 @@ static struct sched_group *find_busiest_group(struct lb_env *env)
force_balance:
/* Looks like there is an imbalance. Compute it */
calculate_imbalance(env, &sds);
return sds.busiest;
return env->imbalance ? sds.busiest : NULL;
out_balanced:
env->imbalance = 0;
@ -9638,7 +9645,8 @@ static inline bool vruntime_normalized(struct task_struct *p)
* - A task which has been woken up by try_to_wake_up() and
* waiting for actually being woken up by sched_ttwu_pending().
*/
if (!se->sum_exec_runtime || p->state == TASK_WAKING)
if (!se->sum_exec_runtime ||
(p->state == TASK_WAKING && p->sched_remote_wakeup))
return true;
return false;

View File

@ -1295,7 +1295,7 @@ static void init_numa_topology_type(void)
n = sched_max_numa_distance;
if (sched_domains_numa_levels <= 1) {
if (sched_domains_numa_levels <= 2) {
sched_numa_topology_type = NUMA_DIRECT;
return;
}
@ -1380,9 +1380,6 @@ void sched_init_numa(void)
break;
}
if (!level)
return;
/*
* 'level' contains the number of unique distances
*