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sched: persistent average load per task
Remove the fall-back to SCHED_LOAD_SCALE by remembering the previous value of cpu_avg_load_per_task() - this is useful because of the hierarchical group model in which task weight can be much smaller. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -554,6 +554,8 @@ struct rq {
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int cpu;
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int online;
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unsigned long avg_load_per_task;
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struct task_struct *migration_thread;
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struct list_head migration_queue;
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#endif
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@ -1427,9 +1429,18 @@ static inline void dec_cpu_load(struct rq *rq, unsigned long load)
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#ifdef CONFIG_SMP
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static unsigned long source_load(int cpu, int type);
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static unsigned long target_load(int cpu, int type);
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static unsigned long cpu_avg_load_per_task(int cpu);
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static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
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static unsigned long cpu_avg_load_per_task(int cpu)
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{
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struct rq *rq = cpu_rq(cpu);
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if (rq->nr_running)
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rq->avg_load_per_task = rq->load.weight / rq->nr_running;
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return rq->avg_load_per_task;
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}
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#ifdef CONFIG_FAIR_GROUP_SCHED
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typedef void (*tg_visitor)(struct task_group *, int, struct sched_domain *);
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@ -2010,18 +2021,6 @@ static unsigned long target_load(int cpu, int type)
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return max(rq->cpu_load[type-1], total);
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}
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/*
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* Return the average load per task on the cpu's run queue
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*/
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static unsigned long cpu_avg_load_per_task(int cpu)
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{
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struct rq *rq = cpu_rq(cpu);
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unsigned long total = weighted_cpuload(cpu);
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unsigned long n = rq->nr_running;
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return n ? total / n : SCHED_LOAD_SCALE;
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}
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/*
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* find_idlest_group finds and returns the least busy CPU group within the
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* domain.
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