diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 4e7efac7b1e..d1707c5f288 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1924,7 +1924,8 @@ out: */ static struct sched_group * find_busiest_group(struct sched_domain *sd, int this_cpu, - unsigned long *imbalance, enum idle_type idle, int *sd_idle) + unsigned long *imbalance, enum idle_type idle, int *sd_idle, + cpumask_t *cpus) { struct sched_group *busiest = NULL, *this = NULL, *group = sd->groups; unsigned long max_load, avg_load, total_load, this_load, total_pwr; @@ -1950,6 +1951,9 @@ find_busiest_group(struct sched_domain *sd, int this_cpu, avg_load = 0; for_each_cpu_mask(i, group->cpumask) { + if (!cpu_isset(i, *cpus)) + continue; + if (*sd_idle && !idle_cpu(i)) *sd_idle = 0; @@ -2063,13 +2067,16 @@ out_balanced: * find_busiest_queue - find the busiest runqueue among the cpus in group. */ static runqueue_t *find_busiest_queue(struct sched_group *group, - enum idle_type idle) + enum idle_type idle, cpumask_t *cpus) { unsigned long load, max_load = 0; runqueue_t *busiest = NULL; int i; for_each_cpu_mask(i, group->cpumask) { + if (!cpu_isset(i, *cpus)) + continue; + load = source_load(i, 0); if (load > max_load) { @@ -2102,19 +2109,22 @@ static int load_balance(int this_cpu, runqueue_t *this_rq, int nr_moved, all_pinned = 0; int active_balance = 0; int sd_idle = 0; + cpumask_t cpus = CPU_MASK_ALL; if (idle != NOT_IDLE && sd->flags & SD_SHARE_CPUPOWER) sd_idle = 1; schedstat_inc(sd, lb_cnt[idle]); - group = find_busiest_group(sd, this_cpu, &imbalance, idle, &sd_idle); +redo: + group = find_busiest_group(sd, this_cpu, &imbalance, idle, + &sd_idle, &cpus); if (!group) { schedstat_inc(sd, lb_nobusyg[idle]); goto out_balanced; } - busiest = find_busiest_queue(group, idle); + busiest = find_busiest_queue(group, idle, &cpus); if (!busiest) { schedstat_inc(sd, lb_nobusyq[idle]); goto out_balanced; @@ -2138,8 +2148,12 @@ static int load_balance(int this_cpu, runqueue_t *this_rq, double_rq_unlock(this_rq, busiest); /* All tasks on this runqueue were pinned by CPU affinity */ - if (unlikely(all_pinned)) + if (unlikely(all_pinned)) { + cpu_clear(busiest->cpu, cpus); + if (!cpus_empty(cpus)) + goto redo; goto out_balanced; + } } if (!nr_moved) { @@ -2226,18 +2240,21 @@ static int load_balance_newidle(int this_cpu, runqueue_t *this_rq, unsigned long imbalance; int nr_moved = 0; int sd_idle = 0; + cpumask_t cpus = CPU_MASK_ALL; if (sd->flags & SD_SHARE_CPUPOWER) sd_idle = 1; schedstat_inc(sd, lb_cnt[NEWLY_IDLE]); - group = find_busiest_group(sd, this_cpu, &imbalance, NEWLY_IDLE, &sd_idle); +redo: + group = find_busiest_group(sd, this_cpu, &imbalance, NEWLY_IDLE, + &sd_idle, &cpus); if (!group) { schedstat_inc(sd, lb_nobusyg[NEWLY_IDLE]); goto out_balanced; } - busiest = find_busiest_queue(group, NEWLY_IDLE); + busiest = find_busiest_queue(group, NEWLY_IDLE, &cpus); if (!busiest) { schedstat_inc(sd, lb_nobusyq[NEWLY_IDLE]); goto out_balanced; @@ -2254,6 +2271,12 @@ static int load_balance_newidle(int this_cpu, runqueue_t *this_rq, nr_moved = move_tasks(this_rq, this_cpu, busiest, imbalance, sd, NEWLY_IDLE, NULL); spin_unlock(&busiest->lock); + + if (!nr_moved) { + cpu_clear(busiest->cpu, cpus); + if (!cpus_empty(cpus)) + goto redo; + } } if (!nr_moved) { @@ -6037,6 +6060,7 @@ void __init sched_init(void) rq->cpu_load[j] = 0; rq->active_balance = 0; rq->push_cpu = 0; + rq->cpu = i; rq->migration_thread = NULL; INIT_LIST_HEAD(&rq->migration_queue); rq->cpu = i; |