[RFC PATCH 07/10] sched: Get rid of scaling usage by cpu_capacity_orig

From: Morten Rasmussen
Date: Tue Dec 02 2014 - 09:07:28 EST

From: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>

Since now we have besides frequency invariant also cpu (uarch plus max
system frequency) invariant cfs_rq::utilization_load_avg both, frequency
and cpu scaling happens as part of the load tracking.
So cfs_rq::utilization_load_avg does not have to be scaled by the original
capacity of the cpu again.

Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
kernel/sched/fair.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5c4c989..090223f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4806,12 +4806,11 @@ static int select_idle_sibling(struct task_struct *p, int target)
static int get_cpu_usage(int cpu)
unsigned long usage = cpu_rq(cpu)->cfs.utilization_load_avg;
- unsigned long capacity = capacity_orig_of(cpu);

if (usage >= SCHED_LOAD_SCALE)
- return capacity;
+ return capacity_orig_of(cpu);

- return (usage * capacity) >> SCHED_LOAD_SHIFT;
+ return usage;


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