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

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Date:	Mon, 5 Sep 2011 08:18:40 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	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

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---
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