linux-kernel - Re: [RFC PATCH v2] support ioctl for tunable user request

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Message-ID: <CAH9JG2W+wEfpL6baQmvigcH9LRn6p0wTszK+urPKxpNfHsjUCQ@mail.gmail.com>
Date:	Mon, 5 Sep 2011 17:49:27 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Lin Ming <lxy@...pku.edu.cn>
Subject: Re: [RFC PATCH v2] support ioctl for tunable user request

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@...pku.edu.cn> wrote:
> On Mon, Aug 29, 2011 at 10:01 PM, Kyungmin Park <kmpark@...radead.org> wrote:
>> On Mon, Aug 29, 2011 at 7:11 PM, Jaehoon Chung <jh80.chung@...sung.com> wrote:
>>> Hi
>>>
>>> Lin Ming wrote:
>>>> On Mon, Aug 29, 2011 at 4:15 PM, Jaehoon Chung <jh80.chung@...sung.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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