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sched/fair: Carve out logic to mark a group for asymmetric packing

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Create a separate function, sched_asym(). A subsequent changeset will
introduce logic to deal with SMT in conjunction with asmymmetric
packing. Such logic will need the statistics of the scheduling
group provided as argument. Update them before calling sched_asym().

Co-developed-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Len Brown <len.brown@intel.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210911011819.12184-6-ricardo.neri-calderon@linux.intel.com
This commit is contained in:
Ricardo Neri 2021-09-10 18:18:18 -07:00 committed by Peter Zijlstra
parent c0d14b57fe
commit aafc917a3c
1 changed files with 14 additions and 8 deletions
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22
kernel/sched/fair.c
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@ -8571,6 +8571,13 @@ group_type group_classify(unsigned int imbalance_pct,
return group_has_spare;
}
static inline bool
sched_asym(struct lb_env *env, struct sd_lb_stats *sds, struct sg_lb_stats *sgs,
struct sched_group *group)
{
return sched_asym_prefer(env->dst_cpu, group->asym_prefer_cpu);
}
/**
* update_sg_lb_stats - Update sched_group's statistics for load balancing.
* @env: The load balancing environment.
@ -8631,18 +8638,17 @@ static inline void update_sg_lb_stats(struct lb_env *env,
}
}
/* Check if dst CPU is idle and preferred to this group */
if (!local_group && env->sd->flags & SD_ASYM_PACKING &&
env->idle != CPU_NOT_IDLE &&
sgs->sum_h_nr_running &&
sched_asym_prefer(env->dst_cpu, group->asym_prefer_cpu)) {
sgs->group_asym_packing = 1;
}
sgs->group_capacity = group->sgc->capacity;
sgs->group_weight = group->group_weight;
/* Check if dst CPU is idle and preferred to this group */
if (!local_group && env->sd->flags & SD_ASYM_PACKING &&
env->idle != CPU_NOT_IDLE && sgs->sum_h_nr_running &&
sched_asym(env, sds, sgs, group)) {
sgs->group_asym_packing = 1;
}
sgs->group_type = group_classify(env->sd->imbalance_pct, group, sgs);
/* Computing avg_load makes sense only when group is overloaded */