[RFC PATCH V2 19/19] sched: don't do power balance on share cpu power domain

From: Preeti U Murthy
Date: Mon Aug 11 2014 - 07:50:48 EST


From: Alex Shi <alex.shi@xxxxxxxxx>

Packing tasks among such domain can't save power, just performance
losing. So no power balance on them.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxx>
[Added CONFIG_SCHED_POWER switch to enable this patch]
Signed-off-by: Preeti U Murthy <preeti@xxxxxxxxxxxxxxxxxx>
---

kernel/sched/fair.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c49ee6c..adda9cf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4744,7 +4744,7 @@ static int get_cpu_for_power_policy(struct sched_domain *sd, int cpu,

policy = get_sd_sched_balance_policy(sd, cpu, p, sds);
if (policy != SCHED_POLICY_PERFORMANCE && sds->group_leader) {
- if (wakeup)
+ if (wakeup && !(sd->flags & SD_SHARE_CPUCAPACITY))
new_cpu = find_leader_cpu(sds->group_leader,
p, cpu, policy);
/* for fork balancing and a little busy task */
@@ -5882,8 +5882,9 @@ static inline void init_sd_lb_stats(struct sd_lb_stats *sds)
static inline void init_sd_lb_power_stats(struct lb_env *env,
struct sd_lb_stats *sds)
{
- if (sched_balance_policy == SCHED_POLICY_PERFORMANCE ||
- env->idle == CPU_NOT_IDLE) {
+ if (sched_balance_policy == SCHED_POLICY_PERFORMANCE
+ || env->sd->flags & SD_SHARE_CPUCAPACITY
+ || env->idle == CPU_NOT_IDLE) {
env->flags &= ~LBF_POWER_BAL;
env->flags |= LBF_PERF_BAL;
return;

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/