linux-kernel - [RFC PATCH 0/2] sched/cpuset: Fix DL BW accounting in case can

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Message-Id: <20230322135959.1998790-1-dietmar.eggemann@arm.com>
Date:   Wed, 22 Mar 2023 14:59:57 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Waiman Long <longman@...hat.com>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Hao Luo <haoluo@...gle.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Qais Yousef <qyousef@...alina.io>, Wei Wang <wvw@...gle.com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: [RFC PATCH 0/2] sched/cpuset: Fix DL BW accounting in case can_attach() fails

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