linux-kernel - Re: [PATCH cgroup/for-4.21 1/2] cpuset: Minor cgroup2 interface updates

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Message-ID: <20181120171920.GA2131@hirez.programming.kicks-ass.net>
Date:   Tue, 20 Nov 2018 18:19:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Waiman Long <longman@...hat.com>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH cgroup/for-4.21 1/2] cpuset: Minor cgroup2 interface
 updates

On Tue, Nov 20, 2018 at 07:44:10AM -0800, Tejun Heo wrote:
> Hello, Peter.
> 
> On Tue, Nov 20, 2018 at 01:46:24PM +0100, Peter Zijlstra wrote:
> > Why though? The Changelog doesn't give rationale for the actual changes.
> 
> Ah yeah, sorry about that.
> 
> > And I'm not sure I agree with either one of them.
> > 
> > The partition is a scheduling feature;
> 
> So is everything with cpuset.cpus prefix.  They're all modifying how
> scheduler handles the cpus.

Fair enough I suppose.

> > and I like 0/1 much better to type, so why not allow that?
> 
> Mostly for consistency and it's generally better to keep interfaces
> minimal - e.g. what if we need to add support for more key words to
> the file?  Would we assign incrementing integers to them?

Or just not give them a numeric alias at all.

But numbers are more minimal than words, so lets just get rid of them
pesky word things ;-)

Alternatively; we could use kstrtobool(). That accepts a metric ton of
input ;-)