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

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Date:	Mon, 5 Sep 2011 20:47:58 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	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 Christoph,

On Mon, Sep 5, 2011 at 6:15 PM, Christoph Hellwig <hch@...radead.org> wrote:
> So what the heck is a tunable request supposed to be?  How does it
> qualify for beeing a generic request/bio type?

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.

Thank you,
Kyungmin Park
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