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From: Lin Ming <lxy@ss.pku.edu.cn>
To: Kyungmin Park <kmpark@infradead.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Jens Axboe <jaxboe@fusionio.com>,
	Arnd Bergmann <arnd.bergmann@linaro.org>,
	Arnd Bergmann <arnd@arndb.de>
Subject: Re: [RFC PATCH v2] support ioctl for tunable user request
Date: Mon, 29 Aug 2011 23:17:25 +0800	[thread overview]
Message-ID: <CAF1ivSZxAuVaivJyoZ=gnMu-YY7AcnBwCWtD74DqPuYAASxTxA@mail.gmail.com> (raw)
In-Reply-To: <CAH9JG2Xfh7JcdBdaCUuD9wFyNPTXg_0JbvVZkEWK5jT2=W3ybA@mail.gmail.com>

On Mon, Aug 29, 2011 at 10:01 PM, Kyungmin Park <kmpark@infradead.org> wrote:
> On Mon, Aug 29, 2011 at 7:11 PM, Jaehoon Chung <jh80.chung@samsung.com> wrote:
>> Hi
>>
>> Lin Ming wrote:
>>> On Mon, Aug 29, 2011 at 4:15 PM, Jaehoon Chung <jh80.chung@samsung.com> wrote:
>>>> This patch is added the ioctl for tunable user request.
>>>
>>> Hi,
>>>
>>> What's the use case for this new ioctl?
>
> The below is the just mmc example.
>
> The main reason is that there's no way to know system or I/O idle, so
> user provides the hint. Using user based I/O, device can TUNE the
> device itself. In case of MMC, background operation can be used.
>
> and another difference from other user request, it's just trigger the
> device tune request, no need to wait the request is done.

OK.

After read the previous patch at:
http://marc.info/?l=linux-mmc&m=131407402925988&w=2

I now get better understanding what "tunable user request" mean.

Thanks.

>
> Thank you,
> Kyungmin Park

  reply	other threads:[~2011-08-29 15:17 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-29  8:15 [RFC PATCH v2] support ioctl for tunable user request Jaehoon Chung
2011-08-29  8:49 ` Lin Ming
2011-08-29 10:11   ` Jaehoon Chung
2011-08-29 14:01     ` Kyungmin Park
2011-08-29 15:17       ` Lin Ming [this message]
2011-09-05  8:49         ` Kyungmin Park
2011-09-05  9:15           ` Christoph Hellwig
2011-09-05 11:47             ` Kyungmin Park
2011-09-05 12:18               ` Christoph Hellwig
2011-09-05 12:40                 ` Kyungmin Park
2011-09-05 15:04                   ` Arnd Bergmann
2011-09-06  4:24                     ` Kyungmin Park
2011-09-08 15:47                       ` Arnd Bergmann
2011-09-08 15:54                         ` Christoph Hellwig

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