linux-kernel - Re: [RFC PATCH 3/3] block: add queue idle timer

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Message-ID: <Pine.LNX.4.44L0.1205151037500.1796-100000@iolanthe.rowland.org>
Date:	Tue, 15 May 2012 10:39:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Lin Ming <ming.m.lin@...el.com>
cc:	Jens Axboe <axboe@...nel.dk>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-scsi@...r.kernel.org>
Subject: Re: [RFC PATCH 3/3] block: add queue idle timer

On Tue, 15 May 2012, Lin Ming wrote:

> Add an idle timer that is set to some suitable timeout and would be
> added when the queue first goes empty. If nothing has happened during
> the timeout interval, then the queue is suspended.

You don't need to create an idle timer for runtime PM support; the 
runtime PM framework already has such a timer.  Read 
Documentation/power/runtime_pm.txt, especially the parts describing 
pm_runtime_autosuspend() and related functions.

Alan Stern

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