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Subject[PATCH 1/2] sched: Use do_div() for 64 bit division at power utilization calculation (putil)
Date
Now explicit casting is done when power usage variable (putil) is calculated

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
This patch was developed on top of the following Alex's repository:
https://github.com/alexshi/power-scheduling/commits/power-scheduling
---
kernel/sched/fair.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f0ead38..14d29b3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3471,8 +3471,10 @@ find_leader_cpu(struct sched_group *group, struct task_struct *p, int this_cpu,
int leader_cpu = -1;
int i;
/* percentage of the task's util */
- unsigned putil = (u64)(p->se.avg.runnable_avg_sum << SCHED_POWER_SHIFT)
- / (p->se.avg.runnable_avg_period + 1);
+ unsigned putil;
+ u64 tmp = (u64) p->se.avg.runnable_avg_sum << SCHED_POWER_SHIFT;
+ do_div(tmp, (p->se.avg.runnable_avg_period + 1));
+ putil = (unsigned) tmp;

/* bias toward local cpu */
if (cpumask_test_cpu(this_cpu, tsk_cpus_allowed(p)) &&
--
1.7.10.4


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