linux-kernel - Re: [PATCH v4] cpuset: Enable cpuset controller in default hierarchy

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Message-ID: <20180309221736.GB5926@hirez.programming.kicks-ass.net>
Date:   Fri, 9 Mar 2018 23:17:36 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Mike Galbraith <efault@....de>, Tejun Heo <tj@...nel.org>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kernel-team@...com, pjt@...gle.com, luto@...capital.net,
        torvalds@...ux-foundation.org, Roman Gushchin <guro@...com>
Subject: Re: [PATCH v4] cpuset: Enable cpuset controller in default hierarchy

On Fri, Mar 09, 2018 at 03:43:34PM -0500, Waiman Long wrote:
> The isolcpus= parameter just reduce the cpus available to the rests of
> the system. The cpuset controller does look at that value and make
> adjustment accordingly, but it has no dependence on exclusive cpu/mem
> features of cpuset.

The isolcpus= boot param is donkey shit and needs to die. cpuset _used_
to be able to fully replace it, but with the advent of cgroup 'feature'
this got lost.

And instead of fixing it, you're making it _far_ worse. You completely
removed all the bits that allow repartitioning the scheduler domains.

Mike is completely right, full NAK on any such approach.