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From: Christoph Hellwig <hch@infradead.org>
To: Kyungmin Park <kmpark@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>,
	Jens Axboe <jaxboe@fusionio.com>,
	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 08:18:40 -0400	[thread overview]
Message-ID: <20110905121840.GA4768@infradead.org> (raw)
In-Reply-To: <CAH9JG2UevPYDOFycLGbh+zu9CyoDx8N8qnCzMy0Lq2b+06EatA@mail.gmail.com>

On Mon, Sep 05, 2011 at 08:47:58PM +0900, Kyungmin Park wrote:
> The concept is similar with DISCARD request except no-wait for request complete
> 
>  #define REQ_DISCARD            (1 << __REQ_DISCARD)
> +#define REQ_TUNE               (1 << __REQ_TUNE)
> 
> As it's hard to detect the idle time at device level, user send the
> tune request to device when idle.

But what does a "tune" request actually do?  It's an overly generic
term, but I still can't even think of what it would do to a storage
device, nor why it would be a generic block layer concept.

> 
> Thank you,
> Kyungmin Park
---end quoted text---

  reply	other threads:[~2011-09-05 12:18 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
2011-09-05  9:15           ` Christoph Hellwig
2011-09-05 11:47             ` Kyungmin Park
2011-09-05 12:18               ` Christoph Hellwig [this message]
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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