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

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Message-ID: <20181130184256.GI2509588@devbig004.ftw2.facebook.com>
Date:   Fri, 30 Nov 2018 10:42:56 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Paolo Valente <paolo.valente@...aro.org>
Cc:     'Paolo Valente' via bfq-iosched <bfq-iosched@...glegroups.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@...r.kernel.org, linux-kernel@...r.kernel.org,
        ulf.hansson@...aro.org, 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

Hello, Paolo.

On Fri, Nov 30, 2018 at 07:23:24PM +0100, Paolo Valente wrote:
> > Then we understood that exactly the same happens with throttling, in
> > case the latter is activated on different devices w.r.t. bfq.
> > 
> > In addition, the same may happen, in the near future, with the
> > bandwidth controller Josef is working on.  If the controller can be
> > configured per device, as with throttling, then statistics may differ,
> > for the same interface files, between bfq, throttling and that
> > controller.

So, regardless of how all these are implemented, what's presented to
user should be consistent and clear.  There's no other way around it.
Only what's relevant should be visible to userspace.

> have you had time to look into this?  Any improvement to this
> interface is ok for us. We are only interested in finally solving this
> interface issue, as, for what concerns us directly, it has been
> preventing legacy code to use bfq for years.

Unfortunately, I don't have any implementation proposal, but we can't
show things this way to userspace.

Thanks.

-- 
tejun