sched/cleanups: Add load balance cpumask pointer to 'struct lb_env'

With this patch struct ld_env will have a pointer of the load balancing
cpumask and we don't need to pass a cpumask around anymore.

Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4FFE8665.3080705@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 22321db..d0cc03b 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3069,6 +3069,9 @@ struct lb_env {
        int                     new_dst_cpu;
        enum cpu_idle_type      idle;
        long                    imbalance;
+       /* The set of CPUs under consideration for load-balancing */
+       struct cpumask          *cpus;
+
        unsigned int            flags;
 
        unsigned int            loop;
@@ -3653,8 +3656,7 @@ fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
  */
 static inline void update_sg_lb_stats(struct lb_env *env,
                        struct sched_group *group, int load_idx,
-                       int local_group, const struct cpumask *cpus,
-                       int *balance, struct sg_lb_stats *sgs)
+                       int local_group, int *balance, struct sg_lb_stats *sgs)
 {
        unsigned long nr_running, max_nr_running, min_nr_running;
        unsigned long load, max_cpu_load, min_cpu_load;
@@ -3671,7 +3673,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
        max_nr_running = 0;
        min_nr_running = ~0UL;
 
-       for_each_cpu_and(i, sched_group_cpus(group), cpus) {
+       for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
                struct rq *rq = cpu_rq(i);
 
                nr_running = rq->nr_running;
@@ -3800,8 +3802,7 @@ static bool update_sd_pick_busiest(struct lb_env *env,
  * @sds: variable to hold the statistics for this sched_domain.
  */
 static inline void update_sd_lb_stats(struct lb_env *env,
-                                     const struct cpumask *cpus,
-                                     int *balance, struct sd_lb_stats *sds)
+                                       int *balance, struct sd_lb_stats *sds)
 {
        struct sched_domain *child = env->sd->child;
        struct sched_group *sg = env->sd->groups;
@@ -3818,8 +3819,7 @@ static inline void update_sd_lb_stats(struct lb_env *env,
 
                local_group = cpumask_test_cpu(env->dst_cpu, sched_group_cpus(sg));
                memset(&sgs, 0, sizeof(sgs));
-               update_sg_lb_stats(env, sg, load_idx, local_group,
-                                  cpus, balance, &sgs);
+               update_sg_lb_stats(env, sg, load_idx, local_group, balance, &sgs);
 
                if (local_group && !(*balance))
                        return;
@@ -4055,7 +4055,6 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
  * to restore balance.
  *
  * @env: The load balancing environment.
- * @cpus: The set of CPUs under consideration for load-balancing.
  * @balance: Pointer to a variable indicating if this_cpu
  *     is the appropriate cpu to perform load balancing at this_level.
  *
@@ -4065,7 +4064,7 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
  *                put to idle by rebalancing its tasks onto our group.
  */
 static struct sched_group *
-find_busiest_group(struct lb_env *env, const struct cpumask *cpus, int *balance)
+find_busiest_group(struct lb_env *env, int *balance)
 {
        struct sd_lb_stats sds;
 
@@ -4075,7 +4074,7 @@ find_busiest_group(struct lb_env *env, const struct cpumask *cpus, int *balance)
         * Compute the various statistics relavent for load balancing at
         * this level.
         */
-       update_sd_lb_stats(env, cpus, balance, &sds);
+       update_sd_lb_stats(env, balance, &sds);
 
        /*
         * this_cpu is not the appropriate cpu to perform load balancing at
@@ -4155,8 +4154,7 @@ ret:
  * find_busiest_queue - find the busiest runqueue among the cpus in group.
  */
 static struct rq *find_busiest_queue(struct lb_env *env,
-                                    struct sched_group *group,
-                                    const struct cpumask *cpus)
+                                    struct sched_group *group)
 {
        struct rq *busiest = NULL, *rq;
        unsigned long max_load = 0;
@@ -4171,7 +4169,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
                if (!capacity)
                        capacity = fix_small_capacity(env->sd, group);
 
-               if (!cpumask_test_cpu(i, cpus))
+               if (!cpumask_test_cpu(i, env->cpus))
                        continue;
 
                rq = cpu_rq(i);
@@ -4252,6 +4250,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
                .dst_grpmask    = sched_group_cpus(sd->groups),
                .idle           = idle,
                .loop_break     = sched_nr_migrate_break,
+               .cpus           = cpus,
        };
 
        cpumask_copy(cpus, cpu_active_mask);
@@ -4260,7 +4259,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
        schedstat_inc(sd, lb_count[idle]);
 
 redo:
-       group = find_busiest_group(&env, cpus, balance);
+       group = find_busiest_group(&env, balance);
 
        if (*balance == 0)
                goto out_balanced;
@@ -4270,7 +4269,7 @@ redo:
                goto out_balanced;
        }
 
-       busiest = find_busiest_queue(&env, group, cpus);
+       busiest = find_busiest_queue(&env, group);
        if (!busiest) {
                schedstat_inc(sd, lb_nobusyq[idle]);
                goto out_balanced;