linux-kernel - Re: [PATCH V14 00/24] mmc: Add Command Queue support

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Date:   Tue, 28 Nov 2017 20:23:57 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Paolo Valente <paolo.valente@...aro.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Bough Chen <haibo.chen@....com>,
        Alex Lemberg <alex.lemberg@...disk.com>,
        Mateusz Nowak <mateusz.nowak@...el.com>,
        Yuliy Izrailov <Yuliy.Izrailov@...disk.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Dong Aisheng <dongas86@...il.com>,
        Das Asutosh <asutoshd@...eaurora.org>,
        Zhangfei Gao <zhangfei.gao@...il.com>,
        Sahitya Tummala <stummala@...eaurora.org>,
        Harjani Ritesh <riteshh@...eaurora.org>,
        Venu Byravarasu <vbyravarasu@...dia.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH V14 00/24] mmc: Add Command Queue support

[...]

>>> While we should look at changing blk-mq to give better workqueue performance,
>>> a bigger gain is likely to be made by adding a new host API to enable the
>>> next already-prepared request to be issued directly from within ->done()
>>> callback of the current request.
>
> I assume that is taken care of by adding the new host cap
> (MMC_CAP_DIRECT_COMPLETE).
>
> So, then it's just a matter of adopting all host drivers, and when we
> are done with that, we can remove that cap. :-)

Ehh, I realize that this not what you really propose, but rather this
is a next step of improvement. Anyway.

[...]

Kind regards
Uffe