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sched/fair: Optimize find_busiest_queue()

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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>
This commit is contained in:
Peter Zijlstra 2013-08-19 15:20:21 +02:00 committed by Ingo Molnar
parent 3ae11c90fd
commit 6906a40839
1 changed files with 1 additions and 4 deletions
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5
kernel/sched/fair.c
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@ -4946,7 +4946,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
unsigned long busiest_load = 0, busiest_power = 1;
int i;
for_each_cpu(i, sched_group_cpus(group)) {
for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
unsigned long power = power_of(i);
unsigned long capacity = DIV_ROUND_CLOSEST(power,
SCHED_POWER_SCALE);
@ -4955,9 +4955,6 @@ static struct rq *find_busiest_queue(struct lb_env *env,
if (!capacity)
capacity = fix_small_capacity(env->sd, group);
if (!cpumask_test_cpu(i, env->cpus))
continue;
rq = cpu_rq(i);
wl = weighted_cpuload(i);