linux-kernel - Re: Kernel 2.6.30 and udevd problem

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Message-ID: <20090630090835.5536a465@jbarnes-g45>
Date:	Tue, 30 Jun 2009 09:08:35 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Dave Airlie <airlied@...ux.ie>
Cc:	Alberto Gonzalez <alberto6674@...il.com>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org, linux-hotplug@...r.kernel.org
Subject: Re: Kernel 2.6.30 and udevd problem

On Tue, 30 Jun 2009 04:46:38 +0100 (IST)
Dave Airlie <airlied@...ux.ie> wrote:

> 
> > On Sunday 28 June 2009 16:28:44 Kay Sievers wrote:
> > > If there isn't something else running which acts on uevents that
> > > trigger drm events, which I wouldn't expect, it seems like a drm
> > > kernel problem.
> > 
> > Ok, thanks for looking at it. I'll sum up the problem for DRM
> > people:
> > 
> > The problem started after upgrading to 2.6.30. At some point, udevd
> > starts to use a lot of CPU time. It happens randomly, but it seems
> > easier to trigger when running something graphics intensive
> > (glxgears, gtkperf, tuxracer..).
> > 
> > Killing udevd and starting it with the --debug switch throws up
> > this when the problem starts:
> 
> I've added jbarnes to the list,
> 
> Jesses are we sending events yet? what for?

Right now we just send uevents at hotplug time, so maybe one of our
hotplug interrupt bits is getting stuck, resulting in a continuous
stream of events as we generate other interrupts (which would happen
when running 3D apps for example).

There's a DRM_DEBUG statement in drivers/gpu/drm/i915/i915_irq.c under
the if (I915_HAS_HOTPLUG(dev)) { check, if you make it into DRM_ERROR
we can see which one is getting stuck.

-- 
Jesse Barnes, Intel Open Source Technology Center
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