linux-kernel - [RFC PATCH v2 1/7] sched/fair: Add related data structure for task based throttle

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Message-Id: <20250409120746.635476-2-ziqianlu@bytedance.com>
Date: Wed,  9 Apr 2025 20:07:40 +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 1/7] sched/fair: Add related data structure for task based throttle

From: Valentin Schneider <vschneid@...hat.com>

Add related data structures for this new throttle functionality.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
Signed-off-by: Aaron Lu <ziqianlu@...edance.com>
---
 include/linux/sched.h |  4 ++++
 kernel/sched/core.c   |  3 +++
 kernel/sched/fair.c   | 12 ++++++++++++
 kernel/sched/sched.h  |  2 ++
 4 files changed, 21 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f96ac19828934..0b55c79fee209 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -880,6 +880,10 @@ struct task_struct {
 
 #ifdef CONFIG_CGROUP_SCHED
 	struct task_group		*sched_task_group;
+#ifdef CONFIG_CFS_BANDWIDTH
+	struct callback_head		sched_throttle_work;
+	struct list_head		throttle_node;
+#endif
 #endif
 
 
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 79692f85643fe..3b8735bc527da 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4492,6 +4492,9 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
 	p->se.cfs_rq			= NULL;
+#ifdef CONFIG_CFS_BANDWIDTH
+	init_cfs_throttle_work(p);
+#endif
 #endif
 
 #ifdef CONFIG_SCHEDSTATS
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0c19459c80422..894202d232efd 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5823,6 +5823,18 @@ static inline int throttled_lb_pair(struct task_group *tg,
 	       throttled_hierarchy(dest_cfs_rq);
 }
 
+static void throttle_cfs_rq_work(struct callback_head *work)
+{
+}
+
+void init_cfs_throttle_work(struct task_struct *p)
+{
+	init_task_work(&p->sched_throttle_work, throttle_cfs_rq_work);
+	/* Protect against double add, see throttle_cfs_rq() and throttle_cfs_rq_work() */
+	p->sched_throttle_work.next = &p->sched_throttle_work;
+	INIT_LIST_HEAD(&p->throttle_node);
+}
+
 static int tg_unthrottle_up(struct task_group *tg, void *data)
 {
 	struct rq *rq = data;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c5a6a503eb6de..921527327f107 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2703,6 +2703,8 @@ extern bool sched_rt_bandwidth_account(struct rt_rq *rt_rq);
 
 extern void init_dl_entity(struct sched_dl_entity *dl_se);
 
+extern void init_cfs_throttle_work(struct task_struct *p);
+
 #define BW_SHIFT		20
 #define BW_UNIT			(1 << BW_SHIFT)
 #define RATIO_SHIFT		8
-- 
2.39.5