linux-kernel - Re: [PATCH V7 00/18] blk-throttle: add .low limit

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Message-ID: <20170327190043.GA96008@dhcp-172-20-189-90.dhcp.thefacebook.com>
Date:   Mon, 27 Mar 2017 12:00:44 -0700
From:   Shaohua Li <shli@...com>
To:     Jens Axboe <axboe@...nel.dk>
CC:     <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <tj@...nel.org>, Vivek Goyal <vgoyal@...hat.com>,
        <jmoyer@...hat.com>, <Kernel-team@...com>
Subject: Re: [PATCH V7 00/18] blk-throttle: add .low limit

On Mon, Mar 27, 2017 at 12:15:29PM -0600, Jens Axboe wrote:
> On 03/27/2017 11:51 AM, Shaohua Li wrote:
> > V6->V7:
> > - Don't overload blk stat, which will simplify the code. This will add extra
> >   space in bio/request though with the low interface configure option on.
> 
> Hmm, why? As far as I can see, it just makes things worse.

Part of the reason is the new callback based blk stat makes enabling stat less
straightforward. I probably can create a fake callback and enalbing the stat
though. Only the last 3 patches depend on this, if you prefer, I can resend
them and add the overload back.

Thanks,
Shaohua