From: Kyungmin Park <kmpark@infradead.org>
To: Jens Axboe <jaxboe@fusionio.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd.bergmann@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, Lin Ming <lxy@ss.pku.edu.cn>
Subject: Re: [RFC PATCH v2] support ioctl for tunable user request
Date: Mon, 5 Sep 2011 17:49:27 +0900 [thread overview]
Message-ID: <CAH9JG2W+wEfpL6baQmvigcH9LRn6p0wTszK+urPKxpNfHsjUCQ@mail.gmail.com> (raw)
In-Reply-To: <CAF1ivSZxAuVaivJyoZ=gnMu-YY7AcnBwCWtD74DqPuYAASxTxA@mail.gmail.com>
Hi Jens,
Any comments on tunable user request concept for flash based storage?
Thank you,
Kyungmin Park
On Tue, Aug 30, 2011 at 12:17 AM, Lin Ming <lxy@ss.pku.edu.cn> wrote:
> 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
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next prev parent reply other threads:[~2011-09-05 8:49 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
2011-09-05 8:49 ` Kyungmin Park [this message]
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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