From: Jens Axboe <axboe@kernel.dk>
To: Ming Lei <ming.lei@redhat.com>,
Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: Re: [PATCH] blk-mq: put driver tag when this request is completed
Date: Wed, 1 Jul 2020 23:03:37 -0600 [thread overview]
Message-ID: <adffbc51-f85a-7507-94da-260ff0c1b7b4@kernel.dk> (raw)
In-Reply-To: <20200702012231.GA2452799@T590>
On 7/1/20 7:22 PM, Ming Lei wrote:
> On Wed, Jul 01, 2020 at 04:16:32PM +0200, Marek Szyprowski wrote:
>> Hi Ming,
>>
>> On 01.07.2020 15:45, Ming Lei wrote:
>>> On Wed, Jul 01, 2020 at 03:01:03PM +0200, Marek Szyprowski wrote:
>>>> On 29.06.2020 11:47, Ming Lei wrote:
>>>>> It is natural to release driver tag when this request is completed by
>>>>> LLD or device since its purpose is for LLD use.
>>>>>
>>>>> One big benefit is that the released tag can be re-used quicker since
>>>>> bio_endio() may take too long.
>>>>>
>>>>> Meantime we don't need to release driver tag for flush request.
>>>>>
>>>>> Cc: Christoph Hellwig <hch@lst.de>
>>>>> Signed-off-by: Ming Lei <ming.lei@redhat.com>
>>>> This patch landed recently in linux-next as commit 36a3df5a4574. Sadly
>>>> it causes a regression on one of my test systems (ARM 32bit, Samsung
>>>> Exynos5422 SoC based Odroid XU3 board with eMMC). The system boots fine
>>>> and then after a few seconds every executed command hangs. No
>>>> panic/ops/any other message. I will try to provide more information asap
>>>> I find something to share. Simple reverting it in linux-next is not
>>>> possible due to dependencies.
>>> What is the exact eMMC's driver code(include the host driver)?
>>
>> dwmmc-exynos (drivers/mmc/host/dw_mmc-exynos.c)
>
> Hi,
>
> Just take a quick look at mmc code, there are only two req->tag
> consumers:
Just a heads up that I've queued up a revert of the offending commits.
It's not just this issue, there's also another one reported with
swapping.
--
Jens Axboe
next prev parent reply other threads:[~2020-07-02 5:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-29 9:47 [PATCH] blk-mq: put driver tag when this request is completed Ming Lei
2020-06-29 15:04 ` Christoph Hellwig
2020-06-29 15:56 ` Jens Axboe
[not found] ` <CGME20200701130104eucas1p1f8dcce58bf704b726aee1e89980fe19e@eucas1p1.samsung.com>
2020-07-01 13:01 ` Marek Szyprowski
2020-07-01 13:45 ` Ming Lei
2020-07-01 14:16 ` Marek Szyprowski
2020-07-01 14:58 ` Marek Szyprowski
2020-07-02 1:22 ` Ming Lei
2020-07-02 5:03 ` Jens Axboe [this message]
2020-07-02 8:04 ` Marek Szyprowski
2020-07-02 9:23 ` Ming Lei
2020-07-02 10:19 ` Marek Szyprowski
2020-07-02 11:48 ` Ming Lei
2020-07-02 12:12 ` Marek Szyprowski
2020-07-06 14:40 Ming Lei
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