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Date:   Fri, 28 Oct 2022 06:42:24 -0000
From:   "tip-bot2 for Qais Yousef" <tip-bot2@linutronix.de>
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Subject: [tip: sched/core] sched/uclamp: Make task_fits_capacity() use util_fits_cpu()
Cc:     Qais Yousef <qais.yousef@arm.com>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>, x86@kernel.org,
        linux-kernel@vger.kernel.org
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The following commit has been merged into the sched/core branch of tip:

Commit-ID:     b48e16a69792b5dc4a09d6807369d11b2970cc36
Gitweb:        https://git.kernel.org/tip/b48e16a69792b5dc4a09d6807369d11b2970cc36
Author:        Qais Yousef <qais.yousef@arm.com>
AuthorDate:    Thu, 04 Aug 2022 15:36:02 +01:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Thu, 27 Oct 2022 11:01:18 +02:00

sched/uclamp: Make task_fits_capacity() use util_fits_cpu()

So that the new uclamp rules in regard to migration margin and capacity
pressure are taken into account correctly.

Fixes: a7008c07a568 ("sched/fair: Make task_fits_capacity() consider uclamp restrictions")
Co-developed-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220804143609.515789-3-qais.yousef@arm.com
---
 kernel/sched/fair.c  | 26 ++++++++++++++++----------
 kernel/sched/sched.h |  9 +++++++++
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0d193ef..db6174b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4549,10 +4549,12 @@ static inline int util_fits_cpu(unsigned long util,
 	return fits;
 }
 
-static inline int task_fits_capacity(struct task_struct *p,
-				     unsigned long capacity)
+static inline int task_fits_cpu(struct task_struct *p, int cpu)
 {
-	return fits_capacity(uclamp_task_util(p), capacity);
+	unsigned long uclamp_min = uclamp_eff_value(p, UCLAMP_MIN);
+	unsigned long uclamp_max = uclamp_eff_value(p, UCLAMP_MAX);
+	unsigned long util = task_util_est(p);
+	return util_fits_cpu(util, uclamp_min, uclamp_max, cpu);
 }
 
 static inline void update_misfit_status(struct task_struct *p, struct rq *rq)
@@ -4565,7 +4567,7 @@ static inline void update_misfit_status(struct task_struct *p, struct rq *rq)
 		return;
 	}
 
-	if (task_fits_capacity(p, capacity_of(cpu_of(rq)))) {
+	if (task_fits_cpu(p, cpu_of(rq))) {
 		rq->misfit_task_load = 0;
 		return;
 	}
@@ -8399,7 +8401,7 @@ static int detach_tasks(struct lb_env *env)
 
 		case migrate_misfit:
 			/* This is not a misfit task */
-			if (task_fits_capacity(p, capacity_of(env->src_cpu)))
+			if (task_fits_cpu(p, env->src_cpu))
 				goto next;
 
 			env->imbalance = 0;
@@ -9404,6 +9406,10 @@ static inline void update_sg_wakeup_stats(struct sched_domain *sd,
 
 	memset(sgs, 0, sizeof(*sgs));
 
+	/* Assume that task can't fit any CPU of the group */
+	if (sd->flags & SD_ASYM_CPUCAPACITY)
+		sgs->group_misfit_task_load = 1;
+
 	for_each_cpu(i, sched_group_span(group)) {
 		struct rq *rq = cpu_rq(i);
 		unsigned int local;
@@ -9423,12 +9429,12 @@ static inline void update_sg_wakeup_stats(struct sched_domain *sd,
 		if (!nr_running && idle_cpu_without(i, p))
 			sgs->idle_cpus++;
 
-	}
+		/* Check if task fits in the CPU */
+		if (sd->flags & SD_ASYM_CPUCAPACITY &&
+		    sgs->group_misfit_task_load &&
+		    task_fits_cpu(p, i))
+			sgs->group_misfit_task_load = 0;
 
-	/* Check if task fits in the group */
-	if (sd->flags & SD_ASYM_CPUCAPACITY &&
-	    !task_fits_capacity(p, group->sgc->max_capacity)) {
-		sgs->group_misfit_task_load = 1;
 	}
 
 	sgs->group_capacity = group->sgc->capacity;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index a4a2004..0ab091b 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -3060,6 +3060,15 @@ static inline bool uclamp_is_used(void)
 	return static_branch_likely(&sched_uclamp_used);
 }
 #else /* CONFIG_UCLAMP_TASK */
+static inline unsigned long uclamp_eff_value(struct task_struct *p,
+					     enum uclamp_id clamp_id)
+{
+	if (clamp_id == UCLAMP_MIN)
+		return 0;
+
+	return SCHED_CAPACITY_SCALE;
+}
+
 static inline
 unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
 				  struct task_struct *p)