sched/fair: Optimize find_busiest_queue()
Use for_each_cpu_and() and thereby avoid computing the capacity for CPUs we know we're not interested in. Reviewed-by: Paul Turner <pjt@google.com> Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-lppceyv6kb3a19g8spmrn20b@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -4946,7 +4946,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
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unsigned long busiest_load = 0, busiest_power = 1;
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unsigned long busiest_load = 0, busiest_power = 1;
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int i;
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int i;
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for_each_cpu(i, sched_group_cpus(group)) {
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for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
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unsigned long power = power_of(i);
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unsigned long power = power_of(i);
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unsigned long capacity = DIV_ROUND_CLOSEST(power,
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unsigned long capacity = DIV_ROUND_CLOSEST(power,
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SCHED_POWER_SCALE);
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SCHED_POWER_SCALE);
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@ -4955,9 +4955,6 @@ static struct rq *find_busiest_queue(struct lb_env *env,
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if (!capacity)
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if (!capacity)
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capacity = fix_small_capacity(env->sd, group);
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capacity = fix_small_capacity(env->sd, group);
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if (!cpumask_test_cpu(i, env->cpus))
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continue;
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rq = cpu_rq(i);
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rq = cpu_rq(i);
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wl = weighted_cpuload(i);
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wl = weighted_cpuload(i);
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