Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758203Ab0DPLlz (ORCPT ); Fri, 16 Apr 2010 07:41:55 -0400 Received: from mail-bw0-f225.google.com ([209.85.218.225]:52920 "EHLO mail-bw0-f225.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756720Ab0DPLly convert rfc822-to-8bit (ORCPT ); Fri, 16 Apr 2010 07:41:54 -0400 Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes To: "Jiri Kosina" , =?utf-8?Q?=C3=89ric_Piel?= Cc: "Andrew Morton" , "Samu Onkalo" , "Pavel Machek" , lm-sensors@lm-sensors.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] lis3lv02d: provide means to disable polled input interface References: <4BBF2BD1.5050107@tremplin-utc.net> Date: Fri, 16 Apr 2010 13:41:49 +0200 MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT From: "Marcin Derlukiewicz" Message-ID: In-Reply-To: User-Agent: Opera Mail/10.10 (Linux) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1706 Lines: 47 Dnia 09-04-2010 o 15:32:59 Jiri Kosina napisał(a): > 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, > sorry for the delay, had a crunch time here is the link for this lsof: https://bugzilla.novell.com/attachment.cgi?id=354953 Best regards, Marcin. -- 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/