Messages in this thread Patch in this message | | | From | Patrick Bellasi <> | Subject | [PATCH v8 10/16] sched/core: uclamp: Add uclamp_util_with() | Date | Tue, 2 Apr 2019 11:41:46 +0100 |
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So far uclamp_util() allows to clamp a specified utilization considering the clamp values requested by RUNNABLE tasks in a CPU. For the Energy Aware Scheduler (EAS) it is interesting to test how clamp values will change when a task is becoming RUNNABLE on a given CPU. For example, EAS is interested in comparing the energy impact of different scheduling decisions and the clamp values can play a role on that.
Add uclamp_util_with() which allows to clamp a given utilization by considering the possible impact on CPU clamp values of a specified task.
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org>
--- Changes in v8: Others: - s/uclamp_effective_value()/uclamp_eff_value()/ --- kernel/sched/sched.h | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index b4c13f3beb2f..a1ed3d94652a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2276,11 +2276,20 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {} #endif /* CONFIG_CPU_FREQ */ #ifdef CONFIG_UCLAMP_TASK -static inline unsigned int uclamp_util(struct rq *rq, unsigned int util) +unsigned int uclamp_eff_value(struct task_struct *p, unsigned int clamp_id); + +static __always_inline +unsigned int uclamp_util_with(struct rq *rq, unsigned int util, + struct task_struct *p) { unsigned int min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value); unsigned int max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value); + if (p) { + min_util = max(min_util, uclamp_eff_value(p, UCLAMP_MIN)); + max_util = max(max_util, uclamp_eff_value(p, UCLAMP_MAX)); + } + /* * Since CPU's {min,max}_util clamps are MAX aggregated considering * RUNNABLE tasks with _different_ clamps, we can end up with an @@ -2291,7 +2300,17 @@ static inline unsigned int uclamp_util(struct rq *rq, unsigned int util) return clamp(util, min_util, max_util); } + +static inline unsigned int uclamp_util(struct rq *rq, unsigned int util) +{ + return uclamp_util_with(rq, util, NULL); +} #else /* CONFIG_UCLAMP_TASK */ +static inline unsigned int uclamp_util_with(struct rq *rq, unsigned int util, + struct task_struct *p) +{ + return util; +} static inline unsigned int uclamp_util(struct rq *rq, unsigned int util) { return util; -- 2.20.1
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