linux-kernel - Re: Laptop shock detection and harddisk protection

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Message-ID: <20080817195103.GD4043@ucw.cz>
Date:	Sun, 17 Aug 2008 21:51:03 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Elias Oltmanns <eo@...ensachen.de>
Cc:	Tejun Heo <tj@...nel.org>,
	Shem Multinymous <multinymous@...il.com>,
	Thomas Renninger <trenn@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: Laptop shock detection and harddisk protection

Hi!

> Short of a satisfying proposition regarding the questions raised, I just
> want to add two things that would be nice to solve in the future one way
> or another and should perhaps be taken into consideration from the
> beginning:
> 
> 1. Disable polling completely when it isn't required: once the hd has
>    spun down, there is no need to keep polling the sensors at all. Only
>    when the first request requiring the hd to spin up arrives, the
>    kernel needs to hold back for a short while to gather enough data
>    from the sensors, so shock protection is up and running again.

hdparm can already tell if disk is spinning or not. As userland is
polling, already, that may be enough?

> 2. Make shock protection interact nicely with suspend operations:
>    currently, we are out of luck if anything should happen after
>    processes have been frozen. This is particularly unfortunatel in the
>    case of s2disk.

I'd say that s2disk is similar to early boot... no protection there. 
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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