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| author | Peter Zijlstra <peterz@infradead.org> | 2013-08-19 15:20:21 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-09-02 08:27:37 +0200 |
| commit | 6906a40839198f33dbb56d20e644c01e00663952 (patch) | |
| tree | 27b31ae4522f4191cb82c17cf30b918b94562412 /kernel/sched/fair.c | |
| parent | 3ae11c90fd055ba1b1b03a014f851b395bdd26ff (diff) | |
| download | linux-stable-6906a40839198f33dbb56d20e644c01e00663952.tar.gz linux-stable-6906a40839198f33dbb56d20e644c01e00663952.tar.bz2 linux-stable-6906a40839198f33dbb56d20e644c01e00663952.zip | |
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>
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index ccf20e76b6b2..bedd30b168a5 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); |