linux-kernel - Re: [RFC PATCH 1/9] sched,cgroup: Add interface for latency-nice

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Date:   Thu, 5 Sep 2019 10:31:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     subhra mazumdar <subhra.mazumdar@...cle.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
        steven.sistare@...cle.com, dhaval.giani@...cle.com,
        daniel.lezcano@...aro.org, vincent.guittot@...aro.org,
        viresh.kumar@...aro.org, tim.c.chen@...ux.intel.com,
        mgorman@...hsingularity.net, parth@...ux.ibm.com,
        patrick.bellasi@....com
Subject: Re: [RFC PATCH 1/9] sched,cgroup: Add interface for latency-nice

On Fri, Aug 30, 2019 at 10:49:36AM -0700, subhra mazumdar wrote:
> Add Cgroup interface for latency-nice. Each CPU Cgroup adds a new file
> "latency-nice" which is shared by all the threads in that Cgroup.

*sigh*, no. We start with a normal per task attribute, and then later,
if it is needed and makes sense, we add it to cgroups.

Also, your Changelog fails on pretty much every point. It doesn't
explain why, it doesn't describe anything and so on.

>From just reading the above, I would expect it to have the range
[-20,19] just like normal nice. Apparently this is not so.