sched: Add tracepoint for qos smt expeller

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I52611
CVE: NA

--------------------------------

There are two caces that we add tracepoint:
a) while online task of sibling cpu is running, it is running
that offline task of local cpu will be set TIF_NEED_RESCHED;
b) while online task of sibling cpu is running, it will expell
that next picked offline task of local cpu.
Signed-off-by: NGuan Jing <guanjing6@huawei.com>
Reviewed-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/trace/events/sched.h

@@ -183,6 +183,61 @@ TRACE_EVENT(sched_switch,
 		__entry->next_comm, __entry->next_pid, __entry->next_prio)
 );
 
+#ifdef CONFIG_QOS_SCHED_SMT_EXPELLER
+/*
+ * Tracepoint for a offline task being resched:
+ */
+TRACE_EVENT(sched_qos_smt_expel,
+
+	TP_PROTO(struct task_struct *sibling_p, int qos_smt_status),
+
+	TP_ARGS(sibling_p, qos_smt_status),
+
+	TP_STRUCT__entry(
+		__array(	char,	sibling_comm,	TASK_COMM_LEN	)
+		__field(	pid_t,	sibling_pid			)
+		__field(	int,	sibling_qos_status		)
+		__field(	int,	sibling_cpu			)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->sibling_comm, sibling_p->comm, TASK_COMM_LEN);
+		__entry->sibling_pid		= sibling_p->pid;
+		__entry->sibling_qos_status	= qos_smt_status;
+		__entry->sibling_cpu		= task_cpu(sibling_p);
+	),
+
+	TP_printk("sibling_comm=%s sibling_pid=%d sibling_qos_status=%d sibling_cpu=%d",
+		  __entry->sibling_comm, __entry->sibling_pid, __entry->sibling_qos_status,
+		  __entry->sibling_cpu)
+);
+
+/*
+ * Tracepoint for a offline task being expelled:
+ */
+TRACE_EVENT(sched_qos_smt_expelled,
+
+	TP_PROTO(struct task_struct *p, int qos_smt_status),
+
+	TP_ARGS(p, qos_smt_status),
+
+	TP_STRUCT__entry(
+		__array(	char,	comm,	TASK_COMM_LEN	)
+		__field(	pid_t,	pid			)
+		__field(	int,	qos_status		)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
+		__entry->pid		= p->pid;
+		__entry->qos_status	= qos_smt_status;
+	),
+
+	TP_printk("comm=%s pid=%d qos_status=%d",
+		  __entry->comm, __entry->pid, __entry->qos_status)
+);
+#endif
+
 /*
  * Tracepoint for a task being migrated:
  */

kernel/sched/fair.c

@@ -7485,12 +7485,16 @@ static bool _qos_smt_check_need_resched(int this_cpu, struct rq *rq)
 		*    and current cpu only has SCHED_IDLE tasks enqueued.
 		*/
 		if (per_cpu(qos_smt_status, cpu) == QOS_LEVEL_ONLINE &&
-		    task_group(current)->qos_level < QOS_LEVEL_ONLINE)
+		    task_group(current)->qos_level < QOS_LEVEL_ONLINE) {
+			trace_sched_qos_smt_expel(cpu_curr(cpu), per_cpu(qos_smt_status, cpu));
 			return true;
+		}
 
 		if (per_cpu(qos_smt_status, cpu) == QOS_LEVEL_OFFLINE &&
-		    rq->curr == rq->idle && sched_idle_cpu(this_cpu))
+		    rq->curr == rq->idle && sched_idle_cpu(this_cpu)) {
+			trace_sched_qos_smt_expel(cpu_curr(cpu), per_cpu(qos_smt_status, cpu));
 			return true;
+		}
 	}
 
 	return false;
@@ -7528,6 +7532,7 @@ pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf
 	if (qos_smt_expelled(this_cpu)) {
 		__this_cpu_write(qos_smt_status, QOS_LEVEL_OFFLINE);
 		schedstat_inc(rq->curr->se.statistics.nr_qos_smt_expelled);
+		trace_sched_qos_smt_expelled(rq->curr, per_cpu(qos_smt_status, this_cpu));
 		return NULL;
 	}
 #endif