linux-kernel - Re: [PATCH] regulator: notify sysfs when voltage is set

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Message-ID: <20120315124631.GJ3138@opensource.wolfsonmicro.com>
Date:	Thu, 15 Mar 2012 12:46:31 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: notify sysfs when voltage is set

On Thu, Mar 15, 2012 at 09:04:33PM +0900, Simon Horman wrote:

> This allows libudev to be used to monitor voltage changes and thus allows
> user-space code to avoid polling the sysfs entry for changes.

I notice that we don't generate similar events for cpufreq...  what are
the performance implications from firing off udev (which isn't free)
every time we scale the CPU frequency?  It feels like this might be
disruptive, especially with a governor like ondemand which responds to
system load.

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