Commit-ID: 6906a40839198f33dbb56d20e644c01e00663952
Gitweb: http://git.kernel.org/tip/6906a40839198f33dbb56d20e644c01e00663952
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Mon, 19 Aug 2013 15:20:21 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 2 Sep 2013 08:27:37 +0200
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@xxxxxxxxxx>
Reviewed-by: Preeti U Murthy <preeti@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-lppceyv6kb3a19g8spmrn20b@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/fair.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ccf20e7..bedd30b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -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);
--
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