linux-kernel - [PATCH 2/4] sched/core: introduce core to struct cfs

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Message-Id: <20231115113341.13261-3-CruzZhao@linux.alibaba.com>
Date:   Wed, 15 Nov 2023 19:33:39 +0800
From:   Cruz Zhao <CruzZhao@...ux.alibaba.com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com, joel@...lfernandes.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] sched/core: introduce core to struct cfs_rq

Introduce core to struct cfs_rq, indicates the corresponding cfs_rq of
rq->core.

Signed-off-by: Cruz Zhao <CruzZhao@...ux.alibaba.com>
---
 kernel/sched/core.c  |  4 ++++
 kernel/sched/fair.c  | 11 +++++++++++
 kernel/sched/sched.h |  1 +
 3 files changed, 16 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7a685fae73c4..647a12af9172 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6432,6 +6432,7 @@ static void sched_core_cpu_starting(unsigned int cpu)
 		if (t == cpu) {
 			rq->core = core_rq;
 			rq->core_id = core_id;
+			rq->cfs.core = &core_rq->cfs;
 		}
 
 		WARN_ON_ONCE(rq->core != core_rq);
@@ -6488,6 +6489,7 @@ static void sched_core_cpu_deactivate(unsigned int cpu)
 		rq = cpu_rq(t);
 		rq->core = core_rq;
 		rq->core_id = core_id;
+		rq->cfs.core = &core_rq->cfs;
 	}
 }
 
@@ -6498,6 +6500,7 @@ static inline void sched_core_cpu_dying(unsigned int cpu)
 	if (rq->core != rq) {
 		rq->core = rq;
 		rq->core_id = cpu;
+		rq->cfs.core = &rq->cfs;
 	}
 }
 
@@ -10016,6 +10019,7 @@ void __init sched_init(void)
 #ifdef CONFIG_SCHED_CORE
 		rq->core = rq;
 		rq->core_id = i;
+		rq->cfs.core = &rq->cfs;
 		rq->core_pick = NULL;
 		rq->core_enabled = 0;
 		rq->core_tree = RB_ROOT;
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2048138ce54b..61cbaa3cc385 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -12420,6 +12420,16 @@ bool cfs_prio_less(const struct task_struct *a, const struct task_struct *b,
 	return delta > 0;
 }
 
+void sched_core_init_cfs_rq(struct task_group *tg, struct cfs_rq *cfs_rq)
+{
+#ifdef CONFIG_FAIR_GROUP_SCHED
+	struct rq *rq = rq_of(cfs_rq);
+	int core_id = rq->core_id;
+
+	cfs_rq->core = tg->cfs_rq[core_id];
+#endif
+}
+
 static int task_is_throttled_fair(struct task_struct *p, int cpu)
 {
 	struct cfs_rq *cfs_rq;
@@ -12715,6 +12725,7 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
 
 		init_cfs_rq(cfs_rq);
 		init_tg_cfs_entry(tg, cfs_rq, se, i, parent->se[i]);
+		sched_core_init_cfs_rq(tg, cfs_rq);
 		init_entity_runnable_average(se);
 	}
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 1b62165fc840..62fca54223a1 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -547,6 +547,7 @@ struct cfs_rq {
 #ifdef CONFIG_SCHED_CORE
 	unsigned int		forceidle_seq;
 	u64			min_vruntime_fi;
+	struct cfs_rq		*core;
 #endif
 
 #ifndef CONFIG_64BIT
-- 
2.39.3