linux-kernel - [PATCH 4/7] sched_ext: Add an event, SCX_EVENT_ENQ_LOCAL

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Message-ID: <20250116151543.80163-5-changwoo@igalia.com>
Date: Fri, 17 Jan 2025 00:15:40 +0900
From: Changwoo Min <changwoo@...lia.com>
To: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com
Cc: kernel-dev@...lia.com,
	linux-kernel@...r.kernel.org,
	Changwoo Min <changwoo@...lia.com>
Subject: [PATCH 4/7] sched_ext: Add an event, SCX_EVENT_ENQ_LOCAL_EXITING

Add a core event, SCX_EVENT_ENQ_LOCAL_EXITING, which represents how many
times a task is enqueued to a local DSQ when exiting if SCX_OPS_ENQ_EXITING
is not set.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 kernel/sched/ext.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 909f12a41934..094e19f5fb78 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1479,6 +1479,12 @@ struct scx_event_stat {
 	 * continued to run because there were no other tasks on the CPU.
 	 */
 	u64		CNTD_RUN_WO_ENQ;
+
+	/*
+	 * If SCX_OPS_ENQ_EXITING is not set, the number of times that a task
+	 * is dispatched to a local DSQ when exiting.
+	 */
+	u64		ENQ_LOCAL_EXITING;
 };
 
 #define SCX_EVENT_IDX(e)	(offsetof(struct scx_event_stat, e)/sizeof(u64))
@@ -1493,6 +1499,7 @@ enum scx_event_kind {
 	SCX_EVENT_DEFINE(INVAL_SELECT_CPU),
 	SCX_EVENT_DEFINE(OFFLINE_LOCAL_DSQ),
 	SCX_EVENT_DEFINE(CNTD_RUN_WO_ENQ),
+	SCX_EVENT_DEFINE(ENQ_LOCAL_EXITING),
 	SCX_EVENT_END = SCX_EVENT_END_IDX(),
 };
 
@@ -1500,6 +1507,7 @@ static const char *scx_event_stat_str[] = {
 	[SCX_EVENT_INVAL_SELECT_CPU]	= "invalid_select_cpu",
 	[SCX_EVENT_OFFLINE_LOCAL_DSQ]	= "offline_local_dsq",
 	[SCX_EVENT_CNTD_RUN_WO_ENQ]	= "cntd_run_wo_enq",
+	[SCX_EVENT_ENQ_LOCAL_EXITING]	= "enq_local_exiting",
 };
 
 /*
@@ -2087,8 +2095,10 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags,
 
 	/* see %SCX_OPS_ENQ_EXITING */
 	if (!static_branch_unlikely(&scx_ops_enq_exiting) &&
-	    unlikely(p->flags & PF_EXITING))
+	    unlikely(p->flags & PF_EXITING)) {
+		scx_add_event(ENQ_LOCAL_EXITING, 1);
 		goto local;
+	}
 
 	if (!SCX_HAS_OP(enqueue))
 		goto global;
-- 
2.48.1