linux-kernel - [RFC PATCH v2 6/7] sched/fair: fix h_nr_runnable accounting with per-task throttle

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Message-Id: <20250409120746.635476-7-ziqianlu@bytedance.com>
Date: Wed,  9 Apr 2025 20:07:45 +0800
From: Aaron Lu <ziqianlu@...edance.com>
To: Valentin Schneider <vschneid@...hat.com>,
	Ben Segall <bsegall@...gle.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Don <joshdon@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Xi Wang <xii@...gle.com>
Cc: linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mel Gorman <mgorman@...e.de>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Chuyi Zhou <zhouchuyi@...edance.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: [RFC PATCH v2 6/7] sched/fair: fix h_nr_runnable accounting with per-task throttle

Task based throttle does not adjust cfs_rq's h_nr_runnable on throttle
anymore but relies on standard en/dequeue_entity(), so there is no need
to take special care of h_nr_runnable in delayed dequeue operations.

Signed-off-by: Aaron Lu <ziqianlu@...edance.com>
---
 kernel/sched/fair.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ff4252995d677..20471a3aa35e6 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5406,8 +5406,6 @@ static void set_delayed(struct sched_entity *se)
 		struct cfs_rq *cfs_rq = cfs_rq_of(se);
 
 		cfs_rq->h_nr_runnable--;
-		if (cfs_rq_throttled(cfs_rq))
-			break;
 	}
 }
 
@@ -5428,8 +5426,6 @@ static void clear_delayed(struct sched_entity *se)
 		struct cfs_rq *cfs_rq = cfs_rq_of(se);
 
 		cfs_rq->h_nr_runnable++;
-		if (cfs_rq_throttled(cfs_rq))
-			break;
 	}
 }
 
-- 
2.39.5