linux-kernel - [PATCH v2 07/11] sched_ext: Add an event, BYPASS

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Message-ID: <20250126101614.232388-8-changwoo@igalia.com>
Date: Sun, 26 Jan 2025 19:16:10 +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 v2 07/11] sched_ext: Add an event, BYPASS_ACTIVATE

Add a core event, BYPASS_ACTIVATE, which represents how many times
the bypass mode has been triggered.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 kernel/sched/ext.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 6dc86bc06596..bb363809e484 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1485,6 +1485,11 @@ struct scx_event_stats {
 	 * is dispatched to a local DSQ when exiting.
 	 */
 	u64		ENQ_SKIP_EXITING;
+
+	/*
+	 * The number of times the bypassing mode has been activated.
+	 */
+	u64		BYPASS_ACTIVATE;
 };
 
 /*
@@ -3707,6 +3712,7 @@ static int select_task_rq_scx(struct task_struct *p, int prev_cpu, int wake_flag
 			p->scx.slice = SCX_SLICE_DFL;
 			p->scx.ddsp_dsq_id = SCX_DSQ_LOCAL;
 		}
+
 		return cpu;
 	}
 }
@@ -4922,6 +4928,7 @@ static void scx_ops_bypass(bool bypass)
 		WARN_ON_ONCE(scx_ops_bypass_depth <= 0);
 		if (scx_ops_bypass_depth != 1)
 			goto unlock;
+		scx_add_event(BYPASS_ACTIVATE, 1);
 	} else {
 		scx_ops_bypass_depth--;
 		WARN_ON_ONCE(scx_ops_bypass_depth < 0);
@@ -5517,6 +5524,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
 	scx_dump_event(s, &events, DISPATCH_LOCAL_DSQ_OFFLINE);
 	scx_dump_event(s, &events, DISPATCH_KEEP_LAST);
 	scx_dump_event(s, &events, ENQ_SKIP_EXITING);
+	scx_dump_event(s, &events, BYPASS_ACTIVATE);
 
 	if (seq_buf_has_overflowed(&s) && dump_len >= sizeof(trunc_marker))
 		memcpy(ei->dump + dump_len - sizeof(trunc_marker),
@@ -7848,6 +7856,7 @@ __bpf_kfunc void scx_bpf_event_stats(struct scx_event_stats *events,
 		scx_agg_event(&e_sys, e_cpu, SELECT_CPU_FALLBACK);
 		scx_agg_event(&e_sys, e_cpu, DISPATCH_LOCAL_DSQ_OFFLINE);
 		scx_agg_event(&e_sys, e_cpu, DISPATCH_KEEP_LAST);
+		scx_agg_event(&e_sys, e_cpu, BYPASS_ACTIVATE);
 	}
 
 	/*
-- 
2.48.1