linux-kernel - [PATCH v2 3/3] sched/debug: Add task uclamp values to SCHED

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Message-Id: <20200226124543.31986-4-valentin.schneider@arm.com>
Date:   Wed, 26 Feb 2020 12:45:43 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, peterz@...radead.org, vincent.guittot@...aro.org,
        Dietmar.Eggemann@....com, patrick.bellasi@...bug.net,
        qais.yousef@....com, t1zhou@...yun.com
Subject: [PATCH v2 3/3] sched/debug: Add task uclamp values to SCHED_DEBUG procfs

Requested and effective uclamp values can be a bit tricky to decipher when
playing with cgroup hierarchies. Add them to a task's procfs when
SCHED_DEBUG is enabled.

Signed-off-by: Valentin Schneider <valentin.schneider@....com>
---
 kernel/sched/debug.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 315ef6de3cc4..a562df57a86e 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -946,6 +946,12 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 	P(se.avg.last_update_time);
 	P(se.avg.util_est.ewma);
 	P(se.avg.util_est.enqueued);
+#endif
+#ifdef CONFIG_UCLAMP_TASK
+	__PS("uclamp.min", p->uclamp[UCLAMP_MIN].value);
+	__PS("uclamp.max", p->uclamp[UCLAMP_MAX].value);
+	__PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
+	__PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
 #endif
 	P(policy);
 	P(prio);
-- 
2.24.0