linux-kernel - Re: [PATCH v6 0/5] sched/deadline: fix cpusets bandwidth accounting

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Message-ID: <20190118161739.GE50184@devbig004.ftw2.facebook.com>
Date:   Fri, 18 Jan 2019 08:17:39 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     peterz@...radead.org, mingo@...hat.com, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org, lizefan@...wei.com,
        cgroups@...r.kernel.org
Subject: Re: [PATCH v6 0/5] sched/deadline: fix cpusets bandwidth accounting

On Thu, Jan 17, 2019 at 09:47:34AM +0100, Juri Lelli wrote:
> Hi,
> 
> v6 of a series of patches, originally authored by Mathieu, with the intent
> of fixing a long standing issue of SCHED_DEADLINE bandwidth accounting.
> As originally reported by Steve [1], when hotplug and/or (certain)
> cpuset reconfiguration operations take place, DEADLINE bandwidth
> accounting information is lost since root domains are destroyed and
> recreated.
> 
> Mathieu's approach is based on restoring bandwidth accounting info on
> the newly created root domains by iterating through the (DEADLINE) tasks
> belonging to the configured cpuset(s).
> 
> Apart from some minor refactoring needed to rebase the set on top of
> Waiman Long's cpuset for cgroup series (now mainline), two changes worth
> of notice:

Generally looks good to me but can you please ask Waiman to take a
look?

Thanks.

-- 
tejun