sched, nohz: Clean up the find_new_ilb() using sched groups nr_busy_cpus

nr_busy_cpus in the sched_group_power indicates whether the group
is semi idle or not. This helps remove the is_semi_idle_group() and simplify
the find_new_ilb() in the context of finding an optimal cpu that can do
idle load balancing.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20111202010832.656983582@sbsiddha-desk.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 821af14..65a6f8b 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4733,7 +4733,6 @@ out_unlock:
  */
 static struct {
        cpumask_var_t idle_cpus_mask;
-       cpumask_var_t grp_idle_mask;
        atomic_t nr_cpus;
        unsigned long next_balance;     /* in jiffy units */
 } nohz ____cacheline_aligned;
@@ -4774,33 +4773,6 @@ static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
                (sd && (sd->flags & flag)); sd = sd->parent)
 
 /**
- * is_semi_idle_group - Checks if the given sched_group is semi-idle.
- * @ilb_group: group to be checked for semi-idleness
- *
- * Returns:    1 if the group is semi-idle. 0 otherwise.
- *
- * We define a sched_group to be semi idle if it has atleast one idle-CPU
- * and atleast one non-idle CPU. This helper function checks if the given
- * sched_group is semi-idle or not.
- */
-static inline int is_semi_idle_group(struct sched_group *ilb_group)
-{
-       cpumask_and(nohz.grp_idle_mask, nohz.idle_cpus_mask,
-                                       sched_group_cpus(ilb_group));
-
-       /*
-        * A sched_group is semi-idle when it has atleast one busy cpu
-        * and atleast one idle cpu.
-        */
-       if (cpumask_empty(nohz.grp_idle_mask))
-               return 0;
-
-       if (cpumask_equal(nohz.grp_idle_mask, sched_group_cpus(ilb_group)))
-               return 0;
-
-       return 1;
-}
-/**
  * find_new_ilb - Finds the optimum idle load balancer for nomination.
  * @cpu:       The cpu which is nominating a new idle_load_balancer.
  *
@@ -4815,8 +4787,8 @@ static inline int is_semi_idle_group(struct sched_group *ilb_group)
 static int find_new_ilb(int cpu)
 {
        int ilb = cpumask_first(nohz.idle_cpus_mask);
+       struct sched_group *ilbg;
        struct sched_domain *sd;
-       struct sched_group *ilb_group;
 
        /*
         * Have idle load balancer selection from semi-idle packages only
@@ -4834,23 +4806,28 @@ static int find_new_ilb(int cpu)
 
        rcu_read_lock();
        for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
-               ilb_group = sd->groups;
+               ilbg = sd->groups;
 
                do {
-                       if (is_semi_idle_group(ilb_group)) {
-                               ilb = cpumask_first(nohz.grp_idle_mask);
+                       if (ilbg->group_weight !=
+                               atomic_read(&ilbg->sgp->nr_busy_cpus)) {
+                               ilb = cpumask_first_and(nohz.idle_cpus_mask,
+                                                       sched_group_cpus(ilbg));
                                goto unlock;
                        }
 
-                       ilb_group = ilb_group->next;
+                       ilbg = ilbg->next;
 
-               } while (ilb_group != sd->groups);
+               } while (ilbg != sd->groups);
        }
 unlock:
        rcu_read_unlock();
 
 out_done:
-       return ilb;
+       if (ilb < nr_cpu_ids && idle_cpu(ilb))
+               return ilb;
+
+       return nr_cpu_ids;
 }
 #else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
 static inline int find_new_ilb(int call_cpu)
@@ -5588,7 +5565,6 @@ __init void init_sched_fair_class(void)
 
 #ifdef CONFIG_NO_HZ
        zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
-       alloc_cpumask_var(&nohz.grp_idle_mask, GFP_NOWAIT);
 #endif
 #endif /* SMP */