linux-kernel - Re: unify the interface of the proportional-share policy in blkio/io

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Message-ID: <20180109195205.GP3668920@devbig577.frc2.facebook.com>
Date:   Tue, 9 Jan 2018 11:52:05 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Paolo Valente <paolo.valente@...aro.org>
Cc:     lennart@...ttering.net, Jens Axboe <axboe@...com>,
        linux-block <linux-block@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        ANGELO RUOCCO <220530@...denti.unimore.it>
Subject: Re: unify the interface of the proportional-share policy in blkio/io

Hello, Paolo.

On Thu, Jan 04, 2018 at 08:00:02PM +0100, Paolo Valente wrote:
> The solution for the second type of parameters may prove useful to
> unify also the computation of statistics for the throttling policy.
> 
> Does this proposal sound reasonable?

So, the above should work too but I wonder whether we could do this
simpler.  Frankly, I wouldn't mind if cfq and bfq can't be mixed on a
system - e.g. they can be built together but you can't enable bfq on
some devides and cfq on others.  If we do that, all we need to do is
just removing / adding cftypes when either gets activated which cgroup
already does.

Thanks.

-- 
tejun