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cpufreq / sched: Pass flags to cpufreq_update_util()

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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: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki
2016-08-16 22:14:55 +02:00
parent 694d0d0bb2
commit 58919e83c8
10 changed files with 67 additions and 74 deletions
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12
kernel/sched/fair.c
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@@ -2875,11 +2875,8 @@ static inline void update_tg_load_avg(struct cfs_rq *cfs_rq, int force) {}
static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq)
{
struct rq *rq = rq_of(cfs_rq);
int cpu = cpu_of(rq);
if (cpu == smp_processor_id() && &rq->cfs == cfs_rq) {
unsigned long max = rq->cpu_capacity_orig;
if (&this_rq()->cfs == cfs_rq) {
struct rq *rq = rq_of(cfs_rq);
/*
* There are a few boundary cases this might miss but it should
@@ -2897,8 +2894,7 @@ static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq)
*
* See cpu_util().
*/
cpufreq_update_util(rq_clock(rq),
min(cfs_rq->avg.util_avg, max), max);
cpufreq_update_util(rq_clock(rq), 0);
}
}
@@ -3162,7 +3158,7 @@ static inline void update_load_avg(struct sched_entity *se, int not_used)
struct cfs_rq *cfs_rq = cfs_rq_of(se);
struct rq *rq = rq_of(cfs_rq);
cpufreq_trigger_update(rq_clock(rq));
cpufreq_update_util(rq_clock(rq), 0);
}
static inline void