linux-kernel - [RFC PATCH v2 09/25] sched/deadline: Account rt-cgroups bandwidth in sched_dl_global

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Message-ID: <20250731105543.40832-10-yurand2000@gmail.com>
Date: Thu, 31 Jul 2025 12:55:27 +0200
From: Yuri Andriaccio <yurand2000@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	Luca Abeni <luca.abeni@...tannapisa.it>,
	Yuri Andriaccio <yuri.andriaccio@...tannapisa.it>
Subject: [RFC PATCH v2 09/25] sched/deadline: Account rt-cgroups bandwidth in sched_dl_global_validate

sched_dl_global_validate (similarly to the previous patch) must take into
account the rt-cgroups' reserved bandwidth.

Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>
---
 kernel/sched/deadline.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 43af48038b9..55b7f883815 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -3098,11 +3098,17 @@ int sched_dl_global_validate(void)
 	u64 period = global_rt_period();
 	u64 new_bw = to_ratio(period, runtime);
 	u64 cookie = ++dl_cookie;
+	u64 dl_groups_root = 0;
 	u64 fair_bw;
 	struct dl_bw *dl_b;
 	int cpu, ret = 0;
 	unsigned long cap, flags;
 
+#ifdef CONFIG_RT_GROUP_SCHED
+	dl_groups_root = to_ratio(root_task_group.dl_bandwidth.dl_period,
+				  root_task_group.dl_bandwidth.dl_runtime);
+#endif
+
 	/*
 	 * Here we want to check the bandwidth not being set to some
 	 * value smaller than the currently allocated bandwidth in
@@ -3119,7 +3125,7 @@ int sched_dl_global_validate(void)
 		fair_bw = dl_bw_fair(cpu);
 
 		raw_spin_lock_irqsave(&dl_b->lock, flags);
-		if (cap_scale(new_bw, cap) < dl_b->total_bw)
+		if (cap_scale(new_bw, cap) < dl_b->total_bw + cap_scale(dl_groups_root, cap))
 			ret = -EBUSY;
 		if (cap_scale(new_bw, cap) + fair_bw > cap_scale(BW_UNIT, cap))
 			ret = -EBUSY;
-- 
2.50.1