On 28-06-18, 17:45, Vincent Guittot wrote: > Add both cfs and rt utilization when selecting an OPP for cfs tasks as rt > can preempt and steal cfs's running time. > > rt util_avg is used to take into account the utilization of rt tasks > on the CPU when selecting OPP. If a rt task migrate, the rt utilization > will not migrate but will decay over time. On an overloaded CPU, cfs > utilization reflects the remaining utilization avialable on CPU. When rt > task migrates, the cfs utilization will increase when tasks will start to > use the newly available capacity. At the same pace, rt utilization will > decay and both variations will compensate each other to keep unchanged > overall utilization and will prevent any OPP drop. > > Cc: Ingo Molnar <mi...@redhat.com> > Cc: Peter Zijlstra <pet...@infradead.org> > Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org> > --- > kernel/sched/cpufreq_schedutil.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-)
Acked-by: Viresh Kumar <viresh.ku...@linaro.org> -- viresh
