diff options
author | Morten Rasmussen <Morten.Rasmussen@arm.com> | 2012-09-14 14:38:16 +0100 |
---|---|---|
committer | Jon Medhurst <tixy@linaro.org> | 2013-07-17 11:12:25 +0100 |
commit | 0d811e649ad31994e8f06b6b18101f249b34e912 (patch) | |
tree | 2ccd5b16c457d74a21ebed1a86a2166c3c208337 | |
parent | b9d3d5612899de4f8372ecfbc4c8f4ba5aa170ec (diff) |
sched: Add HMP task migration ftrace event
Adds ftrace event for tracing task migrations using HMP
optimized scheduling.
Signed-off-by: Morten Rasmussen <Morten.Rasmussen@arm.com>
-rw-r--r-- | include/trace/events/sched.h | 28 | ||||
-rw-r--r-- | kernel/sched/fair.c | 15 |
2 files changed, 39 insertions, 4 deletions
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 496445daa54..203e8e9933b 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -555,6 +555,34 @@ TRACE_EVENT(sched_task_usage_ratio, __entry->comm, __entry->pid, __entry->ratio) ); + +/* + * Tracepoint for HMP (CONFIG_SCHED_HMP) task migrations. + */ +TRACE_EVENT(sched_hmp_migrate, + + TP_PROTO(struct task_struct *tsk, int dest, int force), + + TP_ARGS(tsk, dest, force), + + TP_STRUCT__entry( + __array(char, comm, TASK_COMM_LEN) + __field(pid_t, pid) + __field(int, dest) + __field(int, force) + ), + + TP_fast_assign( + memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN); + __entry->pid = tsk->pid; + __entry->dest = dest; + __entry->force = force; + ), + + TP_printk("comm=%s pid=%d dest=%d force=%d", + __entry->comm, __entry->pid, + __entry->dest, __entry->force) +); #endif /* _TRACE_SCHED_H */ /* This part must be outside protection */ diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 928268df354..ecbeb90adcf 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3570,10 +3570,16 @@ unlock: rcu_read_unlock(); #ifdef CONFIG_SCHED_HMP - if (hmp_up_migration(prev_cpu, &p->se)) - return hmp_select_faster_cpu(p, prev_cpu); - if (hmp_down_migration(prev_cpu, &p->se)) - return hmp_select_slower_cpu(p, prev_cpu); + if (hmp_up_migration(prev_cpu, &p->se)) { + new_cpu = hmp_select_faster_cpu(p, prev_cpu); + trace_sched_hmp_migrate(p, new_cpu, 0); + return new_cpu; + } + if (hmp_down_migration(prev_cpu, &p->se)) { + new_cpu = hmp_select_slower_cpu(p, prev_cpu); + trace_sched_hmp_migrate(p, new_cpu, 0); + return new_cpu; + } /* Make sure that the task stays in its previous hmp domain */ if (!cpumask_test_cpu(new_cpu, &hmp_cpu_domain(prev_cpu)->cpus)) return prev_cpu; @@ -6074,6 +6080,7 @@ static void hmp_force_up_migration(int this_cpu) target->push_cpu = hmp_select_faster_cpu(p, cpu); target->migrate_task = p; force = 1; + trace_sched_hmp_migrate(p, target->push_cpu, 1); } } raw_spin_unlock_irqrestore(&target->lock, flags); |