sched/core: Add trace point for cpu isolation

Add tracepoint to capture the cpu isolation event including KPI for
time it took to isolate.

Change-Id: If2d30000f068afc50db953940f4636ef6a089b24
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index cddb0073c5fb..7b7f1961fd10 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5645,6 +5645,10 @@ int sched_isolate_cpu(int cpu)
 	struct rq *rq = cpu_rq(cpu);
 	cpumask_t avail_cpus;
 	int ret_code = 0;
+	u64 start_time;
+
+	if (trace_sched_isolate_enabled())
+		start_time = sched_clock();
 
 	lock_device_hotplug();
 
@@ -5681,6 +5685,8 @@ int sched_isolate_cpu(int cpu)
 
 out:
 	unlock_device_hotplug();
+	trace_sched_isolate(cpu, cpumask_bits(cpu_isolated_mask)[0],
+			    start_time, 1);
 	return ret_code;
 }
 
@@ -5694,6 +5700,10 @@ int sched_unisolate_cpu_unlocked(int cpu)
 {
 	int ret_code = 0;
 	struct rq *rq = cpu_rq(cpu);
+	u64 start_time;
+
+	if (trace_sched_isolate_enabled())
+		start_time = sched_clock();
 
 	lock_device_hotplug_assert();
 
@@ -5730,6 +5740,8 @@ int sched_unisolate_cpu_unlocked(int cpu)
 	}
 
 out:
+	trace_sched_isolate(cpu, cpumask_bits(cpu_isolated_mask)[0],
+			    start_time, 0);
 	return ret_code;
 }