linux-kernel - Re: [PATCH] [RFC] Add support for uevents on block device idle changes

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Message-ID: <20091118213526.GB16630@srcf.ucam.org>
Date:	Wed, 18 Nov 2009 21:35:26 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	David Zeuthen <david@...ar.dk>, linux-kernel@...r.kernel.org,
	axboe@...nel.dk, linux-hotplug@...r.kernel.org
Subject: Re: [PATCH] [RFC] Add support for uevents on block device idle
	changes

On Wed, Nov 18, 2009 at 10:29:23PM +0100, Kay Sievers wrote:

> I guess, the "idle_since" file could be made poll()able, and throw an
> event when the idle time is re-set to 0, so the value checking needs
> only to happen as long we wait for the disk to become idle. As long as
> it's busy anyway, the rare wakeups should not matter much. :)

That'd be a userspace wakeup every time something gets submitted to the 
block device, which sounds far from ideal...

-- 
Matthew Garrett | mjg59@...f.ucam.org
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