linux-kernel - Re: [PATCHSET v6] blk-mq scheduling framework

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Message-ID: <1484255784.2720.11.camel@sandisk.com>
Date:   Thu, 12 Jan 2017 21:16:38 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "axboe@...com" <axboe@...com>
CC:     "osandov@...ndov.com" <osandov@...ndov.com>
Subject: Re: [PATCHSET v6] blk-mq scheduling framework

On Wed, 2017-01-11 at 14:39 -0700, Jens Axboe wrote:
> I've reworked bits of this to get rid of the shadow requests, thanks
> to Bart for the inspiration. The missing piece, for me, was the fact
> that we have the tags->rqs[] indirection array already. I've done this
> somewhat differently, though, by having the internal scheduler tag
> map be allocated/torn down when an IO scheduler is attached or
> detached. This also means that when we run without a scheduler, we
> don't have to do double tag allocations, it'll work like before.

Hello Jens,

Thanks for having done the rework! This series looks great to me. I have a
few small comments though. I will post these as replies to the individual
patches.

Bart.