sched/cpufreq: Rate limits for SCHED_DEADLINE

When the SCHED_DEADLINE scheduling class increases the CPU utilization, it
should not wait for the rate limit, otherwise it may miss some deadline.

Tests using rt-app on Exynos5422 with up to 10 SCHED_DEADLINE tasks have
shown reductions of even 10% of deadline misses with a negligible
increase of energy consumption (measured through Baylibre Cape).

Signed-off-by: Claudio Scordino <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Joel Fernandes <[email protected]>
Cc: Vincent Guittot <[email protected]>
Cc: [email protected]
Cc: Peter Zijlstra <[email protected]>
Cc: Morten Rasmussen <[email protected]>
Cc: Patrick Bellasi <[email protected]>
Cc: Todd Kjos <[email protected]>
Cc: Dietmar Eggemann <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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