sched: convert idle_balance() to cpumask_var_t.
Impact: stack usage reduction Dynamically allocating cpumasks (when CONFIG_CPUMASK_OFFSTACK) saves space in the stack. cpumask_var_t is just a struct cpumask for !CONFIG_CPUMASK_OFFSTACK. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -3676,7 +3676,10 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
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struct sched_domain *sd;
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struct sched_domain *sd;
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int pulled_task = -1;
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int pulled_task = -1;
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unsigned long next_balance = jiffies + HZ;
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unsigned long next_balance = jiffies + HZ;
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cpumask_t tmpmask;
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cpumask_var_t tmpmask;
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if (!alloc_cpumask_var(&tmpmask, GFP_ATOMIC))
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return;
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for_each_domain(this_cpu, sd) {
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for_each_domain(this_cpu, sd) {
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unsigned long interval;
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unsigned long interval;
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@ -3687,7 +3690,7 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
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if (sd->flags & SD_BALANCE_NEWIDLE)
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if (sd->flags & SD_BALANCE_NEWIDLE)
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/* If we've pulled tasks over stop searching: */
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/* If we've pulled tasks over stop searching: */
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pulled_task = load_balance_newidle(this_cpu, this_rq,
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pulled_task = load_balance_newidle(this_cpu, this_rq,
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sd, &tmpmask);
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sd, tmpmask);
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interval = msecs_to_jiffies(sd->balance_interval);
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interval = msecs_to_jiffies(sd->balance_interval);
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if (time_after(next_balance, sd->last_balance + interval))
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if (time_after(next_balance, sd->last_balance + interval))
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@ -3702,6 +3705,7 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
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*/
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*/
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this_rq->next_balance = next_balance;
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this_rq->next_balance = next_balance;
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}
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}
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free_cpumask_var(tmpmask);
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}
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}
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/*
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/*
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