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

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Pull scheduler fixes from Ingo Molnar:
 "Misc fixes: a (rare) PSI crash fix, a CPU affinity related balancing
  fix, and a toning down of active migration attempts"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cfs: fix spurious active migration
  sched/fair: Fix find_idlest_group() to handle CPU affinity
  psi: Fix a division error in psi poll()
  sched/psi: Fix sampling error and rare div0 crashes with cgroups and high uptime
This commit is contained in:
Linus Torvalds 2019-12-21 10:52:10 -08:00
commit fd7a6d2b8f
2 changed files with 15 additions and 3 deletions
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13
kernel/sched/fair.c
View File

@ -7328,7 +7328,14 @@ static int detach_tasks(struct lb_env *env)
load < 16 && !env->sd->nr_balance_failed)
goto next;
if (load/2 > env->imbalance)
/*
* Make sure that we don't migrate too much load.
* Nevertheless, let relax the constraint if
* scheduler fails to find a good waiting task to
* migrate.
*/
if (load/2 > env->imbalance &&
env->sd->nr_balance_failed <= env->sd->cache_nice_tries)
goto next;
env->imbalance -= load;
@ -8417,6 +8424,10 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p,
if (!idlest)
return NULL;
/* The local group has been skipped because of CPU affinity */
if (!local)
return idlest;
/*
* If the local group is idler than the selected idlest group
* don't try and push the task.

5
kernel/sched/psi.c
View File

@ -185,7 +185,8 @@ static void group_init(struct psi_group *group)
for_each_possible_cpu(cpu)
seqcount_init(&per_cpu_ptr(group->pcpu, cpu)->seq);
group->avg_next_update = sched_clock() + psi_period;
group->avg_last_update = sched_clock();
group->avg_next_update = group->avg_last_update + psi_period;
INIT_DELAYED_WORK(&group->avgs_work, psi_avgs_work);
mutex_init(&group->avgs_lock);
/* Init trigger-related members */
@ -481,7 +482,7 @@ static u64 window_update(struct psi_window *win, u64 now, u64 value)
u32 remaining;
remaining = win->size - elapsed;
growth += div_u64(win->prev_growth * remaining, win->size);
growth += div64_u64(win->prev_growth * remaining, win->size);
}
return growth;