From: Baolin Wang <baolin.wang@linaro.org>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
riteshh@codeaurora.org, asutoshd@codeaurora.org,
Orson Zhai <orsonzhai@gmail.com>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Arnd Bergmann <arnd@arndb.de>,
Linus Walleij <linus.walleij@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
linux-mmc <linux-mmc@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/4] mmc: Add virtual command queue support
Date: Mon, 9 Sep 2019 20:16:43 +0800 [thread overview]
Message-ID: <CAMz4kuKsk7ZN2BnD4zp53PQE22jD-BTsJLL53SL3ndZ5=OCHYA@mail.gmail.com> (raw)
In-Reply-To: <3bcd69fd-2f8e-9b87-7292-4b0b1aa5be78@intel.com>
Hi Adrian,
On Mon, 9 Sep 2019 at 20:02, Adrian Hunter <adrian.hunter@intel.com> wrote:
>
> On 6/09/19 6:52 AM, Baolin Wang wrote:
> > Now the MMC read/write stack will always wait for previous request is
> > completed by mmc_blk_rw_wait(), before sending a new request to hardware,
> > or queue a work to complete request, that will bring context switching
> > overhead, especially for high I/O per second rates, to affect the IO
> > performance.
> >
> > Thus this patch introduces virtual command queue interface, which is
> > similar with the hardware command queue engine's idea, that can remove
> > the context switching.
>
> CQHCI is a hardware interface for eMMC's that support command queuing. What
> you are doing is a software issue queue, unrelated to CQHCI. I think you
Yes.
> should avoid all reference to CQHCI i.e. call it something else.
Since its process is similar with CQHCI and re-use the CQHCI's
interfaces, I called it virtual command queue. I am not sure what else
name is better, any thoughts? VCQHCI? Thanks.
--
Baolin Wang
Best Regards
next prev parent reply other threads:[~2019-09-09 12:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 3:51 [PATCH 0/4] Add MMC virtual command queue support Baolin Wang
2019-09-06 3:51 ` [PATCH 1/4] mmc: host: cqhci: Move the struct cqhci_slot into header file Baolin Wang
2019-09-06 3:52 ` [PATCH 2/4] mmc: Add virtual command queue support Baolin Wang
2019-09-09 12:01 ` Adrian Hunter
2019-09-09 12:16 ` Baolin Wang [this message]
2019-09-09 12:43 ` Adrian Hunter
2019-09-10 3:27 ` Baolin Wang
2019-09-06 3:52 ` [PATCH 3/4] mmc: host: sdhci-sprd: " Baolin Wang
2019-09-06 3:52 ` [PATCH 4/4] mmc: host: sdhci: " Baolin Wang
2019-09-09 12:03 ` Adrian Hunter
2019-09-09 12:11 ` Baolin Wang
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