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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/kernel/sched/stats.h
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@@ -70,7 +70,7 @@
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 		return;
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 	if (!wakeup || p->sched_psi_wake_requeue) {
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-		if (p->flags & PF_MEMSTALL)
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+		if (p->in_memstall)
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 			set |= TSK_MEMSTALL;
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 		if (p->sched_psi_wake_requeue)
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 			p->sched_psi_wake_requeue = 0;
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@@ -90,9 +90,17 @@
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 		return;
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 	if (!sleep) {
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-		if (p->flags & PF_MEMSTALL)
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+		if (p->in_memstall)
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 			clear |= TSK_MEMSTALL;
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 	} else {
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+		/*
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+		 * When a task sleeps, schedule() dequeues it before
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+		 * switching to the next one. Merge the clearing of
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+		 * TSK_RUNNING and TSK_ONCPU to save an unnecessary
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+		 * psi_task_change() call in psi_sched_switch().
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+		 */
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+		clear |= TSK_ONCPU;
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+
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 		if (p->in_iowait)
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 			set |= TSK_IOWAIT;
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 	}
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@@ -109,14 +117,14 @@
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 	 * deregister its sleep-persistent psi states from the old
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 	 * queue, and let psi_enqueue() know it has to requeue.
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 	 */
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-	if (unlikely(p->in_iowait || (p->flags & PF_MEMSTALL))) {
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+	if (unlikely(p->in_iowait || p->in_memstall)) {
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 		struct rq_flags rf;
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 		struct rq *rq;
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 		int clear = 0;
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 		if (p->in_iowait)
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 			clear |= TSK_IOWAIT;
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-		if (p->flags & PF_MEMSTALL)
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+		if (p->in_memstall)
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 			clear |= TSK_MEMSTALL;
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 		rq = __task_rq_lock(p, &rf);
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@@ -126,18 +134,31 @@
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 	}
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 }
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+static inline void psi_sched_switch(struct task_struct *prev,
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+				    struct task_struct *next,
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+				    bool sleep)
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+{
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+	if (static_branch_likely(&psi_disabled))
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+		return;
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+
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+	psi_task_switch(prev, next, sleep);
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+}
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+
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 static inline void psi_task_tick(struct rq *rq)
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 {
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 	if (static_branch_likely(&psi_disabled))
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 		return;
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-	if (unlikely(rq->curr->flags & PF_MEMSTALL))
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+	if (unlikely(rq->curr->in_memstall))
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 		psi_memstall_tick(rq->curr, cpu_of(rq));
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 }
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 #else /* CONFIG_PSI */
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 static inline void psi_enqueue(struct task_struct *p, bool wakeup) {}
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 static inline void psi_dequeue(struct task_struct *p, bool sleep) {}
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 static inline void psi_ttwu_dequeue(struct task_struct *p) {}
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+static inline void psi_sched_switch(struct task_struct *prev,
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+				    struct task_struct *next,
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+				    bool sleep) {}
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 static inline void psi_task_tick(struct rq *rq) {}
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 #endif /* CONFIG_PSI */
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@@ -157,9 +178,10 @@
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 {
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 	unsigned long long now = rq_clock(rq), delta = 0;
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-	if (unlikely(sched_info_on()))
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+	if (sched_info_on()) {
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 		if (t->sched_info.last_queued)
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 			delta = now - t->sched_info.last_queued;
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+	}
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 	sched_info_reset_dequeued(t);
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 	t->sched_info.run_delay += delta;
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@@ -192,7 +214,7 @@
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  */
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 static inline void sched_info_queued(struct rq *rq, struct task_struct *t)
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 {
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-	if (unlikely(sched_info_on())) {
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+	if (sched_info_on()) {
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 		if (!t->sched_info.last_queued)
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 			t->sched_info.last_queued = rq_clock(rq);
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 	}
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@@ -239,7 +261,7 @@
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 static inline void
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 sched_info_switch(struct rq *rq, struct task_struct *prev, struct task_struct *next)
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 {
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-	if (unlikely(sched_info_on()))
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+	if (sched_info_on())
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 		__sched_info_switch(rq, prev, next);
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 }
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