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Date: Tue, 21 Oct 2014 23:07:29 -0700 From: Mike Turquette <mturquette@...aro.org> To: peterz@...radead.org, mingo@...nel.org Cc: linux-kernel@...r.kernel.org, preeti@...ux.vnet.ibm.com, Morten.Rasmussen@....com, kamalesh@...ux.vnet.ibm.com, riel@...hat.com, efault@....de, nicolas.pitre@...aro.org, linaro-kernel@...ts.linaro.org, daniel.lezcano@...aro.org, dietmar.eggemann@....com, pjt@...gle.com, bsegall@...gle.com, vincent.guittot@...aro.org, patches@...aro.org, tuukka.tikkanen@...aro.org, amit.kucheria@...aro.org, Mike Turquette <mturquette@...aro.org> Subject: [PATCH RFC 5/7] sched: cfs: cpu frequency scaling arch functions arch_eval_cpu_freq and arch_scale_cpu_freq are added to allow the scheduler to evaluate if cpu frequency should change and to invoke that change from a safe context. They are weakly defined arch functions that do nothing by default. A CPUfreq governor could use these functions to implement a frequency scaling policy based on updates to per-task statistics or updates to per-cpu utilization. As discussed at Linux Plumbers Conference 2014, the goal will be to focus on a single cpu frequency scaling policy that works for everyone. That may mean that the weak arch functions definitions can be removed entirely and a single policy implements that logic for all architectures. Not-signed-off-by: Mike Turquette <mturquette@...aro.org> --- kernel/sched/fair.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0930ad8..1af6f6d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2265,6 +2265,8 @@ static u32 __compute_runnable_contrib(u64 n) } unsigned long arch_scale_load_capacity(int cpu); +void arch_eval_cpu_freq(struct cpumask *cpus); +void arch_scale_cpu_freq(void); /* * We can represent the historical contribution to runnable average as the @@ -5805,6 +5807,16 @@ unsigned long __weak arch_scale_load_capacity(int cpu) return default_scale_load_capacity(cpu); } +void __weak arch_eval_cpu_freq(struct cpumask *cpus) +{ + return; +} + +void __weak arch_scale_cpu_freq(void) +{ + return; +} + static unsigned long scale_rt_capacity(int cpu) { struct rq *rq = cpu_rq(cpu); -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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