This reverts commit 2aa14d0379cc54bc0ec44adb7a2e0ad02ae293d0.
The way this functionality is implemented is under review and the current
implementation
is considered not safe.
Signed-of-by: Liviu Dudau <liviu.du...@arm.com>
---
kernel/sched/fair.c | 19 ++-----------------
1 file changed, 2 insertions(+), 17 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 12f7d29..0ee9834 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3382,28 +3382,13 @@ static struct attribute_group hmp_attr_group = {
static inline bool is_buddy_busy(int cpu)
{
struct rq *rq = cpu_rq(cpu);
- volatile u32 *psum = &rq->avg.runnable_avg_sum;
- volatile u32 *pperiod = &rq->avg.runnable_avg_period;
- u32 sum, new_sum, period, new_period;
- int timeout = 10;
-
- while (timeout) {
- sum = *psum;
- period = *pperiod;
- new_sum = *psum;
- new_period = *pperiod;
-
- if ((sum == new_sum) && (period == new_period))
- break;
-
- timeout--;
- }
/*
* A busy buddy is a CPU with a high load or a small load with a lot of
* running tasks.
*/
- return ((new_sum << rq->nr_running) > new_period);
+ return ((rq->avg.usage_avg_sum << rq->nr_running) >
+ rq->avg.runnable_avg_period);
}
static inline bool is_light_task(struct task_struct *p)
--
1.7.9.5
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