From: akuster <akuster@mvista.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel-owner@vger.kernel.org, linux-pm@lists.osdl.org
Subject: Re: [PATCH 1/2] PM: fast power off - core
Date: Mon, 29 Jan 2007 08:08:33 -1000 [thread overview]
Message-ID: <45BE3821.4080803@mvista.com> (raw)
In-Reply-To: <20070128191241.GA13596@elf.ucw.cz>
Pavel Machek wrote:
> Hi!
>
>> Fastpoweroff allows a user to power down the system without using rc kill
>> scripts. This is used in the advent of a battery operated device about to lose
>> power. The user interface is vis sysfs /sys/power/fastpoweroff. A simple cat of
>> the fastpoweroff will list any registered profiles. To invoke
>> the profile sequence, echo {profile name} > /sys/power/fastpoweroff.
>
> No, we do not want "poweroff profiles" in kernel. Sorry.
No need to be.
>
> rc kill scripts should be fast enough, if not, fix them. If it is
> impossible (time is spent in kernel waiting for network card to shut
> off), fix that.
>
> What you want is pretty much "echo b > ..../sysrq; halt --now".
The one draw back is that Magic sysrq needs to be enabled and it might
not be desired in a deployed system. "echo u " is more of what I was
looking for.
Thanks for you time.
Armin
next prev parent reply other threads:[~2007-01-29 18:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-27 19:36 [PATCH 1/2] PM: fast power off - core akuster
2007-01-27 20:08 ` Andrew Morton
2007-01-27 22:34 ` akuster
2007-01-28 19:12 ` Pavel Machek
2007-01-29 18:08 ` akuster [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-01-27 20:05 akuster
2007-01-28 18:09 ` Randy Dunlap
2007-01-29 17:37 ` akuster
2007-01-29 17:37 ` akuster
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