linux-kernel - [PATCHv6 0/2] sched/deadline: Walk up cpuset hierarchy to decide root domain when hot-unplug

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Message-ID: <20251117092732.16419-1-piliu@redhat.com>
Date: Mon, 17 Nov 2025 17:27:29 +0800
From: Pingfan Liu <piliu@...hat.com>
To: 
Cc: Pingfan Liu <piliu@...hat.com>,
	Waiman Long <longman@...hat.com>,
	Chen Ridong <chenridong@...weicloud.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Pierre Gondois <pierre.gondois@....com>,
	Ingo Molnar <mingo@...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>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	mkoutny@...e.com,
	linux-kernel@...r.kernel.org
Subject: [PATCHv6 0/2] sched/deadline: Walk up cpuset hierarchy to decide root domain when hot-unplug

This series fixes a deadline bug triggered during CPU hot-removal, which
prevents the CPU from being removed. For details, please refer to the
commit log in [2/2].  In addition, [1/2] exposes the
cpuset_cpus_allowed_locked() interface for use by [2/2].

v5 -> v6:
  Introduce the cpuset_cpus_allowed_locked() variant (thanks to Waiman)
  Use local_cpu_mask_dl to avoid cpumask allocation on the stack (thanks to Juri and Waiman)

v4 -> v5:
  Move the housekeeping part into deadline.c (Thanks for Waiman's suggestion)
  Use cpuset_cpus_allowed() instead of introducing new cpuset function (Thanks for Ridong's suggestion)

Pingfan Liu (2):
  cgroup/cpuset: Introduce cpuset_cpus_allowed_locked()
  sched/deadline: Walk up cpuset hierarchy to decide root domain when
    hot-unplug

 include/linux/cpuset.h  |  1 +
 kernel/cgroup/cpuset.c  | 51 ++++++++++++++++++++++++++------------
 kernel/sched/deadline.c | 54 ++++++++++++++++++++++++++++++++++++-----
 3 files changed, 85 insertions(+), 21 deletions(-)

-- 
2.49.0