On Wed, 2012-06-20 at 11:11 +0200, Vincent Guittot wrote:

On 19 June 2012 11:01, Yong Zhang [off-list ref] wrote:

quoted

On Tue, Jun 19, 2012 at 10:28:56AM +0200, Vincent Guittot wrote:

quoted

Heteregeneous ARM platform uses arch_scale_freq_power function
to reflect the relative capacity of each core

Signed-off-by: Vincent Guittot <redacted>
---
 kernel/sched/features.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index de00a48..d98ae90 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h

@@ -42,7 +42,7 @@ SCHED_FEAT(CACHE_HOT_BUDDY, true)
 /*
  * Use arch dependent cpu power functions
  */
-SCHED_FEAT(ARCH_POWER, false)
+SCHED_FEAT(ARCH_POWER, true)

Hmmm...seems we can remove this knob completely.

Peter,

Do you prefer to keep it or remove it completely ?

I prefer to keep it, the 'we can remove it' is true for all feature
bits, they should never be twiddled in normal circumstances, its a debug
feature. As such it makes sense to allow disabling the arch cpu-power
fiddling.