On 22 September 2012 00:02, <morten.rasmus...@arm.com> wrote: > +config SCHED_HMP_PRIO_FILTER > + bool "(EXPERIMENTAL) Filter HMP migrations by task priority" > + depends on SCHED_HMP
Should it depend on EXPERIMENTAL? > + help > + Enables task priority based HMP migration filter. Any task with > + a NICE value above the threshold will always be on low-power cpus > + with less compute capacity. > + > +config SCHED_HMP_PRIO_FILTER_VAL > + int "NICE priority threshold" > + default 5 > + depends on SCHED_HMP_PRIO_FILTER > + > config HAVE_ARM_SCU > bool > help > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > index 490f1f0..8f0f3b9 100644 > --- a/kernel/sched/fair.c > +++ b/kernel/sched/fair.c > @@ -3129,9 +3129,12 @@ static int __init hmp_cpu_mask_setup(void) > * hmp_down_threshold: max. load allowed for tasks migrating to a slower cpu > * The default values (512, 256) offer good responsiveness, but may need > * tweaking suit particular needs. > + * > + * hmp_up_prio: Only up migrate task with high priority (<hmp_up_prio) > */ > unsigned int hmp_up_threshold = 512; > unsigned int hmp_down_threshold = 256; > +unsigned int hmp_up_prio = NICE_TO_PRIO(CONFIG_SCHED_HMP_PRIO_FILTER_VAL); > > static unsigned int hmp_up_migration(int cpu, struct sched_entity *se); > static unsigned int hmp_down_migration(int cpu, struct sched_entity *se); > @@ -5491,6 +5494,12 @@ static unsigned int hmp_up_migration(int cpu, struct > sched_entity *se) > if (hmp_cpu_is_fastest(cpu)) > return 0; > > +#ifdef CONFIG_SCHED_HMP_PRIO_FILTER > + /* Filter by task priority */ > + if (p->prio >= hmp_up_prio) > + return 0; > +#endif > + > if (cpumask_intersects(&hmp_faster_domain(cpu)->cpus, > tsk_cpus_allowed(p)) > && se->avg.load_avg_ratio > hmp_up_threshold) { > @@ -5507,6 +5516,12 @@ static unsigned int hmp_down_migration(int cpu, struct > sched_entity *se) > if (hmp_cpu_is_slowest(cpu)) > return 0; > > +#ifdef CONFIG_SCHED_HMP_PRIO_FILTER > + /* Filter by task priority */ > + if (p->prio >= hmp_up_prio) > + return 1; > +#endif Even if below cpumask_intersects() fails? > if (cpumask_intersects(&hmp_slower_domain(cpu)->cpus, > tsk_cpus_allowed(p)) > && se->avg.load_avg_ratio < hmp_down_threshold) { -- viresh _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev