forked from luck/tmp_suning_uos_patched
cpumask: reduce stack usage in find_lowest_rq
Impact: reduce stack usage, cleanup Use a cpumask_var_t in find_lowest_rq() and clean up other old cpumask_t calls. Signed-off-by: Mike Travis <travis@sgi.com>
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c90e785be2
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@ -960,16 +960,17 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
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static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
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static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
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static inline int pick_optimal_cpu(int this_cpu,
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const struct cpumask *mask)
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{
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int first;
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/* "this_cpu" is cheaper to preempt than a remote processor */
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if ((this_cpu != -1) && cpu_isset(this_cpu, *mask))
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if ((this_cpu != -1) && cpumask_test_cpu(this_cpu, mask))
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return this_cpu;
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first = first_cpu(*mask);
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if (first != NR_CPUS)
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first = cpumask_first(mask);
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if (first < nr_cpu_ids)
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return first;
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return -1;
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@ -981,6 +982,7 @@ static int find_lowest_rq(struct task_struct *task)
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struct cpumask *lowest_mask = __get_cpu_var(local_cpu_mask);
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int this_cpu = smp_processor_id();
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int cpu = task_cpu(task);
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cpumask_var_t domain_mask;
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if (task->rt.nr_cpus_allowed == 1)
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return -1; /* No other targets possible */
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@ -1013,20 +1015,26 @@ static int find_lowest_rq(struct task_struct *task)
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if (this_cpu == cpu)
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this_cpu = -1; /* Skip this_cpu opt if the same */
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if (alloc_cpumask_var(&domain_mask, GFP_ATOMIC)) {
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for_each_domain(cpu, sd) {
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if (sd->flags & SD_WAKE_AFFINE) {
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cpumask_t domain_mask;
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int best_cpu;
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cpumask_and(&domain_mask, sched_domain_span(sd),
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cpumask_and(domain_mask,
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sched_domain_span(sd),
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lowest_mask);
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best_cpu = pick_optimal_cpu(this_cpu,
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&domain_mask);
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if (best_cpu != -1)
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domain_mask);
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if (best_cpu != -1) {
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free_cpumask_var(domain_mask);
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return best_cpu;
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}
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}
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}
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free_cpumask_var(domain_mask);
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}
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/*
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* And finally, if there were no matches within the domains
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