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

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, 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/

--
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/