linux-kernel - Re: [PATCH V2 00/10] unify the interface of the proportional-share policy in blkio/io

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Date:   Wed, 2 Jan 2019 17:28:05 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     'Paolo Valente' via bfq-iosched <bfq-iosched@...glegroups.com>,
        Angelo Ruocco <angelo.ruocco.90@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Li Zefan <lizefan@...wei.com>,
        Angelo Ruocco <angeloruocco90@...il.com>,
        Dennis Zhou <dennis@...nel.org>,
        Josef Bacik <josef@...icpanda.com>,
        Liu Bo <bo.liu@...ux.alibaba.com>,
        Bart Van Assche <bvanassche@....org>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>, broonie@...nel.org,
        oleksandr@...alenko.name, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH V2 00/10] unify the interface of the proportional-share
 policy in blkio/io



> Il giorno 2 gen 2019, alle ore 17:03, Tejun Heo <tj@...nel.org> ha scritto:
> 
> Hello, Paolo.
> 
> On Sun, Dec 30, 2018 at 11:25:25AM +0100, Paolo Valente wrote:
>> What's the benefit of throwing away months of work, on which we agreed
>> before starting it, and that solves a problem already acknowledged by
>> interested parties?
> 
> Showing multiple conflicting numbers definitely isn't anything which
> is agreed upon.
> 

Sorry, of course you din't realize that sharing interface files had
this consequence, otherwise you'd have protested beforehand.

The problem is that this consequence seems unavoidable: if two
policies have different numbers to convey, through a shared interface
file, then they must be allowed to write their different numbers.  To
me, this doesn't sound like a problem.

The only other natural option is no unification, unless you have a
third way.

What do you prefer, or propose?

Thanks,
Paolo

> Thanks.
> 
> -- 
> tejun