• Rafael J. Wysocki's avatar
    cpufreq / sched: Pass flags to cpufreq_update_util() · 58919e83
    Rafael J. Wysocki authored
    It is useful to know the reason why cpufreq_update_util() has just
    been called and that can be passed as flags to cpufreq_update_util()
    and to the ->func() callback in struct update_util_data.  However,
    doing that in addition to passing the util and max arguments they
    already take would be clumsy, so avoid it.
    
    Instead, use the observation that the schedutil governor is part
    of the scheduler proper, so it can access scheduler data directly.
    This allows the util and max arguments of cpufreq_update_util()
    and the ->func() callback in struct update_util_data to be replaced
    with a flags one, but schedutil has to be modified to follow.
    
    Thus make the schedutil governor obtain the CFS utilization
    information from the scheduler and use the "RT" and "DL" flags
    instead of the special utilization value of ULONG_MAX to track
    updates from the RT and DL sched classes.  Make it non-modular
    too to avoid having to export scheduler variables to modules at
    large.
    
    Next, update all of the other users of cpufreq_update_util()
    and the ->func() callback in struct update_util_data accordingly.
    Suggested-by: default avatarPeter Zijlstra <peterz@infradead.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
    58919e83