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From:   Dietmar Eggemann <dietmar.eggemann@arm.com>
To:     Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Waiman Long <longman@redhat.com>, Tejun Heo <tj@kernel.org>,
        Zefan Li <lizefan.x@bytedance.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Hao Luo <haoluo@google.com>
Cc:     Steven Rostedt <rostedt@goodmis.org>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Luca Abeni <luca.abeni@santannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@santannapisa.it>,
        Qais Yousef <qyousef@layalina.io>, Wei Wang <wvw@google.com>,
        linux-kernel@vger.kernel.org, cgroups@vger.kernel.org
Subject: [RFC PATCH 0/2] sched/cpuset: Fix DL BW accounting in case can_attach() fails
Date:   Wed, 22 Mar 2023 14:59:57 +0100
Message-Id: <20230322135959.1998790-1-dietmar.eggemann@arm.com>
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I followed Longman's idea to add a `deadline task transfer count` into
cpuset and only update the `dl task count` in cpuset_attach().

Moreover, I switched from per-task DL BW request to a per-cpuset one.
This way we don't have to free per-task in case xxx_can_attach() fails.

The DL BW freeing is handled in cpuset_cancel_attach() for the case
`multiple controllers and one of the non-cpuset can_attach() fails`.

Only lightly tested on cgroup v1 with exclusive cpusets so far.

Dietmar Eggemann (2):
  sched/deadline: Create DL BW alloc, free & check overflow interface
  cgroup/cpuset: Free DL BW in case can_attach() fails

 include/linux/sched.h   |  4 ++-
 kernel/cgroup/cpuset.c  | 55 +++++++++++++++++++++++++++++++++++++----
 kernel/sched/core.c     | 19 +++-----------
 kernel/sched/deadline.c | 53 +++++++++++++++++++++++++++++----------
 kernel/sched/sched.h    |  2 +-
 5 files changed, 97 insertions(+), 36 deletions(-)

-- 
2.25.1