sched: convert rebalance_domains() 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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@ -3850,7 +3850,11 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
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unsigned long next_balance = jiffies + 60*HZ;
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unsigned long next_balance = jiffies + 60*HZ;
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int update_next_balance = 0;
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int update_next_balance = 0;
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int need_serialize;
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int need_serialize;
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cpumask_t tmp;
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cpumask_var_t tmp;
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/* Fails alloc? Rebalancing probably not a priority right now. */
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if (!alloc_cpumask_var(&tmp, GFP_ATOMIC))
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return;
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for_each_domain(cpu, sd) {
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for_each_domain(cpu, sd) {
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if (!(sd->flags & SD_LOAD_BALANCE))
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if (!(sd->flags & SD_LOAD_BALANCE))
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@ -3875,7 +3879,7 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
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}
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}
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if (time_after_eq(jiffies, sd->last_balance + interval)) {
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if (time_after_eq(jiffies, sd->last_balance + interval)) {
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if (load_balance(cpu, rq, sd, idle, &balance, &tmp)) {
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if (load_balance(cpu, rq, sd, idle, &balance, tmp)) {
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/*
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/*
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* We've pulled tasks over so either we're no
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* We've pulled tasks over so either we're no
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* longer idle, or one of our SMT siblings is
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* longer idle, or one of our SMT siblings is
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@ -3909,6 +3913,8 @@ out:
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*/
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*/
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if (likely(update_next_balance))
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if (likely(update_next_balance))
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rq->next_balance = next_balance;
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rq->next_balance = next_balance;
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free_cpumask_var(tmp);
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}
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}
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/*
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/*
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