+Mark Brown
Jorge Ramirez-Ortiz jorge.ramirez-ortiz@linaro.org writes:
From: Jorge Ramirez-Ortiz jro@xenomai.org
The current arm64 power scaling calculations deviate from the arm implementation causing scheduling problems on non bigLITTLE architectures (this could be due to baseline/merging issues).
Could you elaborate on the scheduling problems, and on what platforms?
The proposed workaround uses the middle_capacity weighting factor to guarantee that all CPUs report the same power (1024) on non bigLITTLE SoC.
Since the problem isn't really specified in detail, it's not obvious why this is a fix to the problem.
Kevin
Signed-off-by: Jorge Ramirez-Ortiz jro@xenomai.org
arch/arm64/kernel/topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index db8bb29..65837c2 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -325,7 +325,7 @@ static void __init parse_dt_cpu_power(void) * constraint explained near table_efficiency[]. */ if (min_capacity == max_capacity)
return;
middle_capacity = max_capacity >> SCHED_POWER_SHIFT;