A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-11 23:24:22 -04:00
Code Issues Projects Releases Packages Wiki Activity

Merge "sched/cpupri: skip isolated cpus"

Browse source
This commit is contained in:
qctecmdr 2020-08-26 17:22:50 -07:00 • committed by Gerrit - the friendly Code Review server
commit 042b36b17b
1 changed files with 27 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

34
kernel/sched/cpupri.c
View file

@ -41,6 +41,7 @@ static int convert_prio(int prio)
return cpupri;
}
#ifdef CONFIG_SCHED_WALT
/**
* drop_nopreempt_cpus - remove a cpu from the mask if it is likely
* non-preemptible
@ -61,9 +62,16 @@ drop_nopreempt_cpus(struct cpumask *lowest_mask)
cpu = cpumask_next(cpu, lowest_mask);
}
}
#endif /* CONFIG_SCHED_WALT */
#ifndef CONFIG_SCHED_WALT
static inline int __cpupri_find(struct cpupri *cp, struct task_struct *p,
struct cpumask *lowest_mask, int idx)
#else
static inline int __cpupri_find(struct cpupri *cp, struct task_struct *p,
struct cpumask *lowest_mask, int idx,
bool drop_nopreempts)
#endif
{
struct cpupri_vec *vec = &cp->pri_to_cpu[idx];
int skip = 0;
@ -100,6 +108,13 @@ static inline int __cpupri_find(struct cpupri *cp, struct task_struct *p,
if (lowest_mask) {
cpumask_and(lowest_mask, p->cpus_ptr, vec->mask);
#ifdef CONFIG_SCHED_WALT
if (drop_nopreempts)
drop_nopreempt_cpus(lowest_mask);
cpumask_andnot(lowest_mask, lowest_mask,
cpu_isolated_mask);
#endif
/*
* We have to ensure that we have at least one bit
* still set in the array, since the map could have
@ -144,26 +159,28 @@ int cpupri_find_fitness(struct cpupri *cp, struct task_struct *p,
{
int task_pri = convert_prio(p->prio);
int idx, cpu;
#ifdef CONFIG_SCHED_WALT
bool drop_nopreempts = task_pri <= MAX_RT_PRIO;
#endif
BUG_ON(task_pri >= CPUPRI_NR_PRIORITIES);
#ifdef CONFIG_SCHED_WALT
retry:
#endif
for (idx = 0; idx < task_pri; idx++) {
#ifndef CONFIG_SCHED_WALT
if (!__cpupri_find(cp, p, lowest_mask, idx))
#else
if (!__cpupri_find(cp, p, lowest_mask, idx, drop_nopreempts))
continue;
#endif
if (!lowest_mask || !fitness_fn)
return 1;
#ifdef CONFIG_SCHED_WALT
cpumask_andnot(lowest_mask, lowest_mask,
cpu_isolated_mask);
#endif
if (drop_nopreempts)
drop_nopreempt_cpus(lowest_mask);
/* Ensure the capacity of the CPUs fit the task */
for_each_cpu(cpu, lowest_mask) {
if (!fitness_fn(p, cpu))
@ -179,6 +196,8 @@ retry:
return 1;
}
#ifdef CONFIG_SCHED_WALT
/*
* If we can't find any non-preemptible cpu's, retry so we can
* find the lowest priority target and avoid priority inversion.
@ -187,6 +206,7 @@ retry:
drop_nopreempts = false;
goto retry;
}
#endif
/*
* If we failed to find a fitting lowest_mask, kick off a new search