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authorIngo Molnar <mingo@elte.hu>2009-01-05 13:53:39 +0100
committerIngo Molnar <mingo@elte.hu>2009-01-05 13:53:39 +0100
commit5359c32eb7402124abc9964d5d53639fe0739cea (patch)
treed77b6967fe8420678bb9d1d936855ac0699c196a /kernel/sched_fair.c
parent8916edef5888c5d8fe283714416a9ca95b4c3431 (diff)
parentfe0bdec68b77020281dc814805edfe594ae89e0f (diff)
Merge branch 'linus' into sched/urgent
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index b808563f4f1..e0c0b4bc3f0 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1013,16 +1013,33 @@ static void yield_task_fair(struct rq *rq)
* search starts with cpus closest then further out as needed,
* so we always favor a closer, idle cpu.
* Domains may include CPUs that are not usable for migration,
- * hence we need to mask them out (cpu_active_map)
+ * hence we need to mask them out (cpu_active_mask)
*
* Returns the CPU we should wake onto.
*/
#if defined(ARCH_HAS_SCHED_WAKE_IDLE)
static int wake_idle(int cpu, struct task_struct *p)
{
- cpumask_t tmp;
struct sched_domain *sd;
int i;
+ unsigned int chosen_wakeup_cpu;
+ int this_cpu;
+
+ /*
+ * At POWERSAVINGS_BALANCE_WAKEUP level, if both this_cpu and prev_cpu
+ * are idle and this is not a kernel thread and this task's affinity
+ * allows it to be moved to preferred cpu, then just move!
+ */
+
+ this_cpu = smp_processor_id();
+ chosen_wakeup_cpu =
+ cpu_rq(this_cpu)->rd->sched_mc_preferred_wakeup_cpu;
+
+ if (sched_mc_power_savings >= POWERSAVINGS_BALANCE_WAKEUP &&
+ idle_cpu(cpu) && idle_cpu(this_cpu) &&
+ p->mm && !(p->flags & PF_KTHREAD) &&
+ cpu_isset(chosen_wakeup_cpu, p->cpus_allowed))
+ return chosen_wakeup_cpu;
/*
* If it is idle, then it is the best cpu to run this task.
@@ -1040,10 +1057,9 @@ static int wake_idle(int cpu, struct task_struct *p)
if ((sd->flags & SD_WAKE_IDLE)
|| ((sd->flags & SD_WAKE_IDLE_FAR)
&& !task_hot(p, task_rq(p)->clock, sd))) {
- cpus_and(tmp, sd->span, p->cpus_allowed);
- cpus_and(tmp, tmp, cpu_active_map);
- for_each_cpu_mask_nr(i, tmp) {
- if (idle_cpu(i)) {
+ for_each_cpu_and(i, sched_domain_span(sd),
+ &p->cpus_allowed) {
+ if (cpu_active(i) && idle_cpu(i)) {
if (i != task_cpu(p)) {
schedstat_inc(p,
se.nr_wakeups_idle);
@@ -1236,13 +1252,13 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
* this_cpu and prev_cpu are present in:
*/
for_each_domain(this_cpu, sd) {
- if (cpu_isset(prev_cpu, sd->span)) {
+ if (cpumask_test_cpu(prev_cpu, sched_domain_span(sd))) {
this_sd = sd;
break;
}
}
- if (unlikely(!cpu_isset(this_cpu, p->cpus_allowed)))
+ if (unlikely(!cpumask_test_cpu(this_cpu, &p->cpus_allowed)))
goto out;
/*