tracing/sched: add load balancer tracepoint
When doing performance analysis it can be useful to see exactly what is going on with the load balancer - when it runs and why exactly it may not be redistributing load. This additional tracepoint will show the idle context of the load balance operation (idle, not idle, newly idle), various values from the load balancing operation, the final result, and the new balance interval. Change-Id: I1538c411c5f9d17d7d37d84ead6210756be2d884 Signed-off-by: Steve Muckle <smuckle@codeaurora.org>
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@ -245,6 +245,56 @@ TRACE_EVENT(sched_cpu_hotplug,
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__entry->status ? "online" : "offline", __entry->error)
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);
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/*
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* Tracepoint for load balancing:
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*/
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#if NR_CPUS > 32
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#error "Unsupported NR_CPUS for lb tracepoint."
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#endif
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TRACE_EVENT(sched_load_balance,
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TP_PROTO(int cpu, enum cpu_idle_type idle, int balance,
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unsigned long group_mask, int busiest_nr_running,
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unsigned long imbalance, unsigned int env_flags, int ld_moved,
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unsigned int balance_interval),
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TP_ARGS(cpu, idle, balance, group_mask, busiest_nr_running,
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imbalance, env_flags, ld_moved, balance_interval),
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TP_STRUCT__entry(
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__field( int, cpu)
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__field( enum cpu_idle_type, idle)
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__field( int, balance)
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__field( unsigned long, group_mask)
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__field( int, busiest_nr_running)
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__field( unsigned long, imbalance)
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__field( unsigned int, env_flags)
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__field( int, ld_moved)
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__field( unsigned int, balance_interval)
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),
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TP_fast_assign(
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__entry->cpu = cpu;
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__entry->idle = idle;
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__entry->balance = balance;
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__entry->group_mask = group_mask;
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__entry->busiest_nr_running = busiest_nr_running;
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__entry->imbalance = imbalance;
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__entry->env_flags = env_flags;
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__entry->ld_moved = ld_moved;
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__entry->balance_interval = balance_interval;
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),
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TP_printk("cpu=%d state=%s balance=%d group=%#lx busy_nr=%d imbalance=%ld flags=%#x ld_moved=%d bal_int=%d",
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__entry->cpu,
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__entry->idle == CPU_IDLE ? "idle" :
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(__entry->idle == CPU_NEWLY_IDLE ? "newly_idle" : "busy"),
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__entry->balance,
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__entry->group_mask, __entry->busiest_nr_running,
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__entry->imbalance, __entry->env_flags, __entry->ld_moved,
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__entry->balance_interval)
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);
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DECLARE_EVENT_CLASS(sched_process_template,
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TP_PROTO(struct task_struct *p),
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@ -5027,7 +5027,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
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{
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int ld_moved, cur_ld_moved, active_balance = 0;
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struct sched_group *group;
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struct rq *busiest;
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struct rq *busiest = NULL;
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unsigned long flags;
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struct cpumask *cpus = __get_cpu_var(load_balance_mask);
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@ -5249,6 +5249,11 @@ out_one_pinned:
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ld_moved = 0;
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out:
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trace_sched_load_balance(this_cpu, idle, *balance,
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group ? group->cpumask[0] : 0,
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busiest ? busiest->nr_running : 0,
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env.imbalance, env.flags, ld_moved,
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sd->balance_interval);
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return ld_moved;
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}
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