linux-kernel - [PATCH AUTOSEL 6.12 08/19] sched/debug: Provide slice length for fair tasks

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Message-Id: <20250211013047.4096767-8-sashal@kernel.org>
Date: Mon, 10 Feb 2025 20:30:36 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Christian Loehle <christian.loehle@....com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <sashal@...nel.org>,
	mingo@...hat.com,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org
Subject: [PATCH AUTOSEL 6.12 08/19] sched/debug: Provide slice length for fair tasks

From: Christian Loehle <christian.loehle@....com>

[ Upstream commit 9065ce69754dece78606c8bbb3821449272e56bf ]

Since commit:

  857b158dc5e8 ("sched/eevdf: Use sched_attr::sched_runtime to set request/slice suggestion")

... we have the userspace per-task tunable slice length, which is
a key parameter that is otherwise difficult to obtain, so provide
it in /proc/$PID/sched.

[ mingo: Clarified the changelog. ]

Signed-off-by: Christian Loehle <christian.loehle@....com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/r/453349b1-1637-42f5-a7b2-2385392b5956@arm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/sched/debug.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 82b165bf48c42..1e3bc0774efd5 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1264,6 +1264,8 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 	if (task_has_dl_policy(p)) {
 		P(dl.runtime);
 		P(dl.deadline);
+	} else if (fair_policy(p->policy)) {
+		P(se.slice);
 	}
 #ifdef CONFIG_SCHED_CLASS_EXT
 	__PS("ext.enabled", task_on_scx(p));
-- 
2.39.5