All of lore.kernel.org
 help / color / mirror / Atom feed
From: Jiri Kosina <jkosina@suse.cz>
To: "Éric Piel" <eric.piel@tremplin-utc.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Samu Onkalo <samu.p.onkalo@nokia.com>,
	Pavel Machek <pavel@ucw.cz>,
	lm-sensors@lm-sensors.org, linux-kernel@vger.kernel.org,
	Marcin Derlukiewicz <marcin@derlukiewicz.pl>
Subject: Re: [PATCH] lis3lv02d: provide means to disable polled input interface
Date: Fri, 9 Apr 2010 15:32:59 +0200 (CEST)	[thread overview]
Message-ID: <alpine.LNX.2.00.1004091532150.8345@pobox.suse.cz> (raw)
In-Reply-To: <4BBF2BD1.5050107@tremplin-utc.net>

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.

WARNING: multiple messages have this Message-ID (diff)
From: Jiri Kosina <jkosina@suse.cz>
To: "Éric Piel" <eric.piel@tremplin-utc.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Samu Onkalo <samu.p.onkalo@nokia.com>,
	Pavel Machek <pavel@ucw.cz>,
	lm-sensors@lm-sensors.org, linux-kernel@vger.kernel.org,
	Marcin Derlukiewicz <marcin@derlukiewicz.pl>
Subject: Re: [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled
Date: Fri, 09 Apr 2010 13:32:59 +0000	[thread overview]
Message-ID: <alpine.LNX.2.00.1004091532150.8345@pobox.suse.cz> (raw)
In-Reply-To: <4BBF2BD1.5050107@tremplin-utc.net>

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.

_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors

  reply	other threads:[~2010-04-09 13:33 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-09 12:56 [PATCH] lis3lv02d: provide means to disable polled input interface Jiri Kosina
2010-04-09 12:56 ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Jiri Kosina
2010-04-09 13:29 ` [PATCH] lis3lv02d: provide means to disable polled input interface Éric Piel
2010-04-09 13:29   ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Éric Piel
2010-04-09 13:32   ` Jiri Kosina [this message]
2010-04-09 13:32     ` Jiri Kosina
2010-04-09 18:11     ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled input interface Jean Delvare
2010-04-09 18:11       ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Jean Delvare
2010-04-16 11:41     ` [PATCH] lis3lv02d: provide means to disable polled input interface Marcin Derlukiewicz
2010-04-16 11:41       ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Marcin Derlukiewicz
2010-04-16 12:00       ` [PATCH] lis3lv02d: provide means to disable polled input interface samu.p.onkalo
2010-04-16 12:00         ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled samu.p.onkalo
2010-04-16 12:13         ` [PATCH] lis3lv02d: provide means to disable polled input interface Marcin Derlukiewicz
2010-04-16 12:13           ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Marcin Derlukiewicz
2010-04-16 13:56           ` [PATCH] lis3lv02d: provide means to disable polled input interface Éric Piel
2010-04-16 13:56             ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Éric Piel
2010-04-16 14:26             ` [PATCH] lis3lv02d: provide means to disable polled input interface Marcin Derlukiewicz
2010-04-16 14:26               ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Marcin Derlukiewicz
2010-04-16 14:30               ` [PATCH] lis3lv02d: provide means to disable polled input interface Éric Piel
2010-04-16 14:30                 ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Éric Piel
2010-04-16 12:06       ` [PATCH] lis3lv02d: provide means to disable polled input interface Éric Piel
2010-04-16 12:06         ` [lm-sensors] [PATCH] lis3lv02d: provide means to disable polled Éric Piel
2010-04-09 21:41   ` [PATCH] lis3lv02d: provide means to disable polled input interface Frans Pop

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=alpine.LNX.2.00.1004091532150.8345@pobox.suse.cz \
    --to=jkosina@suse.cz \
    --cc=akpm@linux-foundation.org \
    --cc=eric.piel@tremplin-utc.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lm-sensors@lm-sensors.org \
    --cc=marcin@derlukiewicz.pl \
    --cc=pavel@ucw.cz \
    --cc=samu.p.onkalo@nokia.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.