Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 9 Apr 2010 15:32:59 +0200 (CEST) | From | Jiri Kosina <> | Subject | Re: [PATCH] lis3lv02d: provide means to disable polled input interface |
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On Fri, 9 Apr 2010, Éric Piel wrote:
> > This is reported to create 20% CPU usage increase (and proportionaly higher > > power consumption) just for the ipolldevd kernel thread (which is used > > to read the sensor). > > > > As most users probably only use the freefall functionality of the driver > > and not the joystick interface, provide means for disabling the registration > > of joystick device altogether via module parameter. > > (I'd rather make it default to 0, but this will break backwards compatibility). > Are you saying there is a 20% CPU usage even when the joystick interface > is not open? This should not happen (and this is not happening on my > laptop). The polling should happen only when a userspace app opens the > joystick interface (like running neverball). > > So I'd tend to think it's more due to a misconfiguration of the system > (like xserver using the joystick interface as a pointer device) or it's > a bug in the way we set up the polling. Could you investigate and let me > know?
Marcin originally reported this to me.
Marcin, could you please check 'lsof' output to see whether the joystick interface has been open by some application?
Thanks,
-- Jiri Kosina SUSE Labs, Novell Inc. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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