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
| ||
|
Date: Fri, 9 Apr 2010 20:11:10 +0200 From: Jean Delvare <khali@...ux-fr.org> To: Jiri Kosina <jkosina@...e.cz> Cc: Éric Piel <eric.piel@...mplin-utc.net>, Marcin Derlukiewicz <marcin@...lukiewicz.pl>, linux-kernel@...r.kernel.org, lm-sensors@...sensors.org, Pavel Machek <pavel@....cz>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled input interface On Fri, 9 Apr 2010 15:32:59 +0200 (CEST), Jiri Kosina wrote: > 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? I would randomly blame hal. It keeps my IR remote control device opened all the time and I have no idea why. -- Jean Delvare -- 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/
Powered by blists - more mailing lists