diff options
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 2626c6bac9f7..377c77b35751 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1559,7 +1559,8 @@ struct task_numa_env { static unsigned long cpu_load(struct rq *rq); static unsigned long cpu_runnable(struct rq *rq); static unsigned long cpu_util(int cpu); -static inline long adjust_numa_imbalance(int imbalance, int dst_running); +static inline long adjust_numa_imbalance(int imbalance, + int dst_running, int dst_weight); static inline enum numa_type numa_classify(unsigned int imbalance_pct, @@ -1939,7 +1940,8 @@ static void task_numa_find_cpu(struct task_numa_env *env, src_running = env->src_stats.nr_running - 1; dst_running = env->dst_stats.nr_running + 1; imbalance = max(0, dst_running - src_running); - imbalance = adjust_numa_imbalance(imbalance, dst_running); + imbalance = adjust_numa_imbalance(imbalance, dst_running, + env->dst_stats.weight); /* Use idle CPU if there is no imbalance */ if (!imbalance) { @@ -8995,16 +8997,14 @@ next_group: #define NUMA_IMBALANCE_MIN 2 -static inline long adjust_numa_imbalance(int imbalance, int dst_running) +static inline long adjust_numa_imbalance(int imbalance, + int dst_running, int dst_weight) { - unsigned int imbalance_min; - /* * Allow a small imbalance based on a simple pair of communicating - * tasks that remain local when the source domain is almost idle. + * tasks that remain local when the destination is lightly loaded. */ - imbalance_min = NUMA_IMBALANCE_MIN; - if (dst_running <= imbalance_min) + if (dst_running < (dst_weight >> 2) && imbalance <= NUMA_IMBALANCE_MIN) return 0; return imbalance; @@ -9106,9 +9106,10 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s } /* Consider allowing a small imbalance between NUMA groups */ - if (env->sd->flags & SD_NUMA) + if (env->sd->flags & SD_NUMA) { env->imbalance = adjust_numa_imbalance(env->imbalance, - busiest->sum_nr_running); + busiest->sum_nr_running, busiest->group_weight); + } return; } |