[PATCH v3 18/22] sched: add power/performance balance allowed flag

From: Alex Shi
Date: Sat Jan 05 2013 - 03:39:24 EST

If the cpu condition is suitable for power balance, power_lb
will be set, perf_lb will be clean. If the condition is suitable for
performance balance, their value will will set oppositely.

If the domain is suitable for power balance, but balance should not
be down by this cpu, both of perf_lb and power_lb are cleared to wait a
suitable cpu to do power balance. That mean no any balance, neither
power balance nor performance balance in this domain.

This logical will be implemented by following patches.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxx>
kernel/sched/fair.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0596e81..380c8cf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4029,6 +4029,8 @@ struct lb_env {
unsigned int loop;
unsigned int loop_break;
unsigned int loop_max;
+ int power_lb; /* if power balance needed */
+ int perf_lb; /* if performance balance needed */

@@ -5179,6 +5181,8 @@ static int load_balance(int this_cpu, struct rq *this_rq,
.idle = idle,
.loop_break = sched_nr_migrate_break,
.cpus = cpus,
+ .power_lb = 0,
+ .perf_lb = 1,

cpumask_copy(cpus, cpu_active_mask);

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