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Message-ID: <5a64fdd5-ee1a-7609-99a9-a8d1e282e393@redhat.com>
Date:   Wed, 3 May 2023 13:45:24 -0400
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Subject: Re: [PATCH v2 5/6] sched/deadline: Create DL BW alloc, free & check
 overflow interface
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To:     Juri Lelli <juri.lelli@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Qais Yousef <qyousef@layalina.io>, Tejun Heo <tj@kernel.org>,
        Zefan Li <lizefan.x@bytedance.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Hao Luo <haoluo@google.com>
Cc:     Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        linux-kernel@vger.kernel.org, luca.abeni@santannapisa.it,
        claudio@evidence.eu.com, tommaso.cucinotta@santannapisa.it,
        bristot@redhat.com, mathieu.poirier@linaro.org,
        cgroups@vger.kernel.org,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Wei Wang <wvw@google.com>, Rick Yiu <rickyiu@google.com>,
        Quentin Perret <qperret@google.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Sudeep Holla <sudeep.holla@arm.com>
References: <20230503072228.115707-1-juri.lelli@redhat.com>
 <20230503072228.115707-6-juri.lelli@redhat.com>
From:   Waiman Long <longman@redhat.com>
In-Reply-To: <20230503072228.115707-6-juri.lelli@redhat.com>
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On 5/3/23 03:22, Juri Lelli wrote:
> From: Dietmar Eggemann <dietmar.eggemann@arm.com>
>
> Rework the existing dl_cpu_busy() interface which offers DL BW overflow
> checking and per-task DL BW allocation.
>
> Add dl_bw_free() as an interface to be able to free DL BW.
> It will be used to allow freeing of the DL BW request done during
> cpuset_can_attach() in case multiple controllers are attached to the
> cgroup next to the cpuset controller and one of the non-cpuset
> can_attach() fails.
>
> dl_bw_alloc() (and dl_bw_free()) now take a `u64 dl_bw` parameter
> instead of `struct task_struct *p` used in dl_cpu_busy().  This allows
> to allocate DL BW for a set of tasks too rater than only for a single

Typo: "rater" => "rather".

Cheers,
Longman