mirror of https://gitee.com/openkylin/linux.git
sched/fair: Mask UTIL_AVG_UNCHANGED usages
The _task_util_est() is mainly used to add/remove the task contribution to/from the rq's estimated utilization at task enqueue/dequeue time. In both cases we ensure the UTIL_AVG_UNCHANGED flag is set to keep consistency between enqueue and dequeue time while still being transparent to update_load_avg calls which will eventually reset the flag. Let's move the flag forcing within _task_util_est() itself so that we can simplify calling code by hiding that estimated utilization implementation detail into one of its internal functions. This will affect also the "public" API task_util_est() but we know that the flag will (eventually) impact just on the LSB of the estimated utilization, thus it's certainly acceptable. Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Morten Rasmussen <morten.rasmussen@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Perret <quentin.perret@arm.com> Cc: Steve Muckle <smuckle@google.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Todd Kjos <tkjos@google.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Link: http://lkml.kernel.org/r/20181105145400.935-3-patrick.bellasi@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -3604,7 +3604,7 @@ static inline unsigned long _task_util_est(struct task_struct *p)
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{
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struct util_est ue = READ_ONCE(p->se.avg.util_est);
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return max(ue.ewma, ue.enqueued);
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return (max(ue.ewma, ue.enqueued) | UTIL_AVG_UNCHANGED);
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}
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static inline unsigned long task_util_est(struct task_struct *p)
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@ -3622,7 +3622,7 @@ static inline void util_est_enqueue(struct cfs_rq *cfs_rq,
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/* Update root cfs_rq's estimated utilization */
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enqueued = cfs_rq->avg.util_est.enqueued;
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enqueued += (_task_util_est(p) | UTIL_AVG_UNCHANGED);
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enqueued += _task_util_est(p);
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WRITE_ONCE(cfs_rq->avg.util_est.enqueued, enqueued);
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}
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@ -3650,8 +3650,7 @@ util_est_dequeue(struct cfs_rq *cfs_rq, struct task_struct *p, bool task_sleep)
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/* Update root cfs_rq's estimated utilization */
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ue.enqueued = cfs_rq->avg.util_est.enqueued;
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ue.enqueued -= min_t(unsigned int, ue.enqueued,
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(_task_util_est(p) | UTIL_AVG_UNCHANGED));
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ue.enqueued -= min_t(unsigned int, ue.enqueued, _task_util_est(p));
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WRITE_ONCE(cfs_rq->avg.util_est.enqueued, ue.enqueued);
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/*
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@ -6292,7 +6291,7 @@ static unsigned long cpu_util_without(int cpu, struct task_struct *p)
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*/
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if (unlikely(task_on_rq_queued(p) || current == p)) {
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estimated -= min_t(unsigned int, estimated,
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(_task_util_est(p) | UTIL_AVG_UNCHANGED));
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_task_util_est(p));
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}
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util = max(util, estimated);
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}
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