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

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Date:   Fri, 18 Jan 2019 17:46:42 +0100
From:   Juri Lelli <juri.lelli@...hat.com>
To:     longman@...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, tj@...nel.org
Subject: Re: [PATCH v6 0/5] sched/deadline: fix cpusets bandwidth accounting

On 18/01/19 08:17, Tejun Heo wrote:
> 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?

Argh! I should have cc-ed him in the first instance.

Thanks for reviewing.

Waiman, do you see anything wrong with this series? Thanks!

https://lore.kernel.org/lkml/20190117084739.17078-1-juri.lelli@redhat.com/