sched: HMP: Additional trace points for debugging HMP behaviour
1. Replace magic numbers in code for migration trace.
Trace points still emit a number as force=<n> field:
force=0 : wakeup migration
force=1 : forced migration
force=2 : offload migration
force=3 : idle pull migration
2. Add trace to expose offload decision-making.
Also adds tracing rq->nr_running so that you can
look back to see what state the RQ was in at the time.
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 203e8e9..66dc53b 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -530,6 +530,29 @@
__entry->load)
);
+TRACE_EVENT(sched_rq_nr_running,
+
+ TP_PROTO(int cpu, unsigned int nr_running, int nr_iowait),
+
+ TP_ARGS(cpu, nr_running, nr_iowait),
+
+ TP_STRUCT__entry(
+ __field(int, cpu)
+ __field(unsigned int, nr_running)
+ __field(int, nr_iowait)
+ ),
+
+ TP_fast_assign(
+ __entry->cpu = cpu;
+ __entry->nr_running = nr_running;
+ __entry->nr_iowait = nr_iowait;
+ ),
+
+ TP_printk("cpu=%d nr_running=%u nr_iowait=%d",
+ __entry->cpu,
+ __entry->nr_running, __entry->nr_iowait)
+);
+
/*
* Tracepoint for showing tracked task cpu usage ratio [0..1023].
*/
@@ -559,6 +582,10 @@
/*
* Tracepoint for HMP (CONFIG_SCHED_HMP) task migrations.
*/
+#define HMP_MIGRATE_WAKEUP 0
+#define HMP_MIGRATE_FORCE 1
+#define HMP_MIGRATE_OFFLOAD 2
+#define HMP_MIGRATE_IDLE_PULL 3
TRACE_EVENT(sched_hmp_migrate,
TP_PROTO(struct task_struct *tsk, int dest, int force),
@@ -583,6 +610,51 @@
__entry->comm, __entry->pid,
__entry->dest, __entry->force)
);
+
+TRACE_EVENT(sched_hmp_offload_abort,
+
+ TP_PROTO(int cpu, int data, char *label),
+
+ TP_ARGS(cpu,data,label),
+
+ TP_STRUCT__entry(
+ __array(char, label, 64)
+ __field(int, cpu)
+ __field(int, data)
+ ),
+
+ TP_fast_assign(
+ strncpy(__entry->label, label, 64);
+ __entry->cpu = cpu;
+ __entry->data = data;
+ ),
+
+ TP_printk("cpu=%d data=%d label=%63s",
+ __entry->cpu, __entry->data,
+ __entry->label)
+);
+
+TRACE_EVENT(sched_hmp_offload_succeed,
+
+ TP_PROTO(int cpu, int dest_cpu),
+
+ TP_ARGS(cpu,dest_cpu),
+
+ TP_STRUCT__entry(
+ __field(int, cpu)
+ __field(int, dest_cpu)
+ ),
+
+ TP_fast_assign(
+ __entry->cpu = cpu;
+ __entry->dest_cpu = dest_cpu;
+ ),
+
+ TP_printk("cpu=%d dest=%d",
+ __entry->cpu,
+ __entry->dest_cpu)
+);
+
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */