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Merge tag 'v4.20-rc5' into sched/core, to pick up fixes

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2018-12-03 11:42:17 +01:00
parent 3e18450108 2595646791
commit 5f675231e4
5490 changed files with 297187 additions and 85701 deletions
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53
kernel/sched/core.c
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@@ -2880,6 +2880,18 @@ unsigned long long nr_context_switches(void)
return sum;
}
/*
* Consumers of these two interfaces, like for example the cpuidle menu
* governor, are using nonsensical data. Preferring shallow idle state selection
* for a CPU that has IO-wait which might not even end up running the task when
* it does become runnable.
*/
unsigned long nr_iowait_cpu(int cpu)
{
return atomic_read(&cpu_rq(cpu)->nr_iowait);
}
/*
* IO-wait accounting, and how its mostly bollocks (on SMP).
*
@@ -2915,31 +2927,11 @@ unsigned long nr_iowait(void)
unsigned long i, sum = 0;
for_each_possible_cpu(i)
sum += atomic_read(&cpu_rq(i)->nr_iowait);
sum += nr_iowait_cpu(i);
return sum;
}
/*
* Consumers of these two interfaces, like for example the cpuidle menu
* governor, are using nonsensical data. Preferring shallow idle state selection
* for a CPU that has IO-wait which might not even end up running the task when
* it does become runnable.
*/
unsigned long nr_iowait_cpu(int cpu)
{
struct rq *this = cpu_rq(cpu);
return atomic_read(&this->nr_iowait);
}
void get_iowait_load(unsigned long *nr_waiters, unsigned long *load)
{
struct rq *rq = this_rq();
*nr_waiters = atomic_read(&rq->nr_iowait);
*load = rq->load.weight;
}
#ifdef CONFIG_SMP
/*
@@ -5746,15 +5738,10 @@ int sched_cpu_activate(unsigned int cpu)
#ifdef CONFIG_SCHED_SMT
/*
* The sched_smt_present static key needs to be evaluated on every
* hotplug event because at boot time SMT might be disabled when
* the number of booted CPUs is limited.
*
* If then later a sibling gets hotplugged, then the key would stay
* off and SMT scheduling would never be functional.
* When going up, increment the number of cores with SMT present.
*/
if (cpumask_weight(cpu_smt_mask(cpu)) > 1)
static_branch_enable_cpuslocked(&sched_smt_present);
if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
static_branch_inc_cpuslocked(&sched_smt_present);
#endif
set_cpu_active(cpu, true);
@@ -5798,6 +5785,14 @@ int sched_cpu_deactivate(unsigned int cpu)
*/
synchronize_rcu_mult(call_rcu, call_rcu_sched);
#ifdef CONFIG_SCHED_SMT
/*
* When going down, decrement the number of cores with SMT present.
*/
if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
static_branch_dec_cpuslocked(&sched_smt_present);
#endif
if (!sched_smp_initialized)
return 0;