android-mainline/NOUPSTREAM-ANDROID-sched-Introduce-uclamp-latency-and-boost-wrapper.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Quentin Perret <quentin.perret@arm.com>
Date: Tue, 30 Jul 2019 13:58:29 +0100
Subject: NOUPSTREAM: ANDROID: sched: Introduce uclamp latency and boost
 wrapper

Introduce a simple helper to read the latency_sensitive flag from a
task. It is called uclamp_latency_sensitive() to match the API
proposed by Patrick.

While at it, introduce uclamp_boosted() which returns true only when a
task has a non-null min-clamp.

[CPNOTE: 30/06/21] Lee: Hoping for an upstream alternative (conversation died)

Bug: 120440300
Change-Id: I5fc747da8b58625257a6604a3c88487b657fbe7a
Suggested-by: Patrick Bellasi <patrick.bellasi@arm.com>
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
---
 kernel/sched/sched.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2871,6 +2871,11 @@ unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
 	return clamp(util, min_util, max_util);
 }
 
+static inline bool uclamp_boosted(struct task_struct *p)
+{
+	return uclamp_eff_value(p, UCLAMP_MIN) > 0;
+}
+
 /*
  * When uclamp is compiled in, the aggregation at rq level is 'turned off'
  * by default in the fast path and only gets turned on once userspace performs
@@ -2891,12 +2896,36 @@ unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
 	return util;
 }
 
+static inline bool uclamp_boosted(struct task_struct *p)
+{
+	return false;
+}
+
 static inline bool uclamp_is_used(void)
 {
 	return false;
 }
 #endif /* CONFIG_UCLAMP_TASK */
 
+#ifdef CONFIG_UCLAMP_TASK_GROUP
+static inline bool uclamp_latency_sensitive(struct task_struct *p)
+{
+	struct cgroup_subsys_state *css = task_css(p, cpu_cgrp_id);
+	struct task_group *tg;
+
+	if (!css)
+		return false;
+	tg = container_of(css, struct task_group, css);
+
+	return tg->latency_sensitive;
+}
+#else
+static inline bool uclamp_latency_sensitive(struct task_struct *p)
+{
+	return false;
+}
+#endif /* CONFIG_UCLAMP_TASK_GROUP */
+
 #ifdef arch_scale_freq_capacity
 # ifndef arch_scale_freq_invariant
 #  define arch_scale_freq_invariant()	true