linux-kernel - Re: Generic battery interface

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 30 Jul 2006 11:18:48 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Vojtech Pavlik <vojtech@...e.cz>
Cc:	Shem Multinymous <multinymous@...il.com>,
	"Brown, Len" <len.brown@...el.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-thinkpad@...ux-thinkpad.org, linux-acpi@...r.kernel.org
Subject: Re: Generic battery interface

Hi!

> > I do not understand this. Any polling (in kernel or in userspace) will
> > wake the CPU, wasting power.
> 
> The kernel, however, has all the gory details at hand, and can decide
> much better about the polling frequency, than the (hopefully) hardware
> agnostic userspace.
> 
> Imagine your Zaurus: You don't need to poll very often when you are on
> the flat part of the LiIon discharge curve, you probably want more
> detailed info near the end.

OTOH some applications just want more frequent polling than
others. Shem's "first update after N msec" solution looks most
flexible here.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/