Messages in this thread | | | Subject | Re: [suspend/resume] Re: userspace notification from module | From | Bartłomiej Zimoń <> | Date | Sun, 03 Jan 2010 18:20:44 +0100 |
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Dnia 3 stycznia 2010 0:29 "Rafael J. Wysocki" <rjw@sisk.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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