diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-01-05 13:53:39 +0100 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-01-05 13:53:39 +0100 |
commit | 5359c32eb7402124abc9964d5d53639fe0739cea (patch) | |
tree | d77b6967fe8420678bb9d1d936855ac0699c196a /kernel/sched_fair.c | |
parent | getrusage: RUSAGE_THREAD should return ru_utime and ru_stime (diff) | |
parent | Merge branch 'audit.b61' of git://git.kernel.org/pub/scm/linux/kernel/git/vir... (diff) | |
download | linux-5359c32eb7402124abc9964d5d53639fe0739cea.tar.xz linux-5359c32eb7402124abc9964d5d53639fe0739cea.zip |
Merge branch 'linus' into sched/urgent
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r-- | kernel/sched_fair.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index b808563f4f19..e0c0b4bc3f08 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; /* |