linux-kernel - Re: [suspend/resume] Re: userspace notification from module

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Message-ID: <ff72e3e.3b5092ec.4b40d1ec.54407@o2.pl>
Date:	Sun, 03 Jan 2010 18:20:44 +0100
From:	Bartłomiej Zimoń <uzi18@...pl>
To:	linux-kernel@...r.kernel.org
Cc:	Andy Walls <awalls@...ix.net>,
	Daniel Borkmann <danborkmann@...glemail.com>,
	linux-kernel@...r.kernel.org,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [suspend/resume] Re: userspace notification from module

Dnia 3 stycznia 2010 0:29 	"Rafael J. Wysocki" <rjw@...k.pl> napisał(a):
> > - could be even used partialy by pm-utils
> > - it is perfect just to notify about event
> 
> OK, but why exactly do _you_ need that to happen?
> 
> There's one important drawback of making the kernel generate the notification.
> Namely, even if your userspace task is notified by the kernel of a PM event,
> that doesn't mean it'll have the time to act upon that, because the kernel will
> attempt to freeze it right after the notification has been sent.  This means
> you'd need a way to make the kernel wait for your user space process to finish
> it's job before continuing the suspend/hibernate process.  Otherwise it's not
> going to be very useful.
> 

So if it is bad idea, we could create more advenced implementation.
i.e. IPC or callbacks for this kind of events.

There is vision in my mind to have alternative to pm-utils, 
but even more powerfull and easy to implement in program.
I could try to implement something like that.

Rafael i'm open for Your suggestions.

Best regards.
Bartłomiej Zimoń
PLD Linux, Kadu Team, FreeRunner user
http://kadu-im.blogspot.com/

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