Re: [PROBLEM] Machine Freezes while Running Crossover Office
From: Linus Torvalds
Date: Mon May 30 2005 - 12:31:16 EST
On Mon, 30 May 2005, Pekka Enberg wrote:
> On Sun, 2005-05-29 at 15:59 -0700, Linus Torvalds wrote:
> > However, I don't understand how wine can block the X server from doing
> > even cursor updates. It might be a scheduler bug, of course. The one thing
> > a bigger pipe buffer does is end up changing scheduling behaviour.
> > (On the other hand, I would not be surprised if Wine does something that
> > makes X pause, like use DGA or whatever and tells X not to update the
> > screen, including cursors).
> It is not just X. Running the following shell script when hitting the
Ok, this implies that the scheduler is really screwed up, we're not
scheduling anything else during that time.
Ingo, this sounds like you need to take a look.
Pekka, can you confirm that the SysRQ output in your original email was
from a "hung" time? Because that clearly shows that stuff is happening in
user space, which means that it's definitely not a kernel loop.
Also, pipes are a bit special from a scheduling standpoint because they
use the magic "synchronous wakeup" thing, and it might be worthwhile
trying to just change the two calls to "wake_up_interruptible_sync()" in
fs/pipe.c to the non-sync version (ie just remove the "_sync" part).
> It looks like no other processes other than wineserver and
> wine-preloader get any CPU time (also evident from Sysrq-P traces).
One more thing: are those processes given RT priority? Because if so, it
likely boils down to a wine bug again - a busy-looping high-priority
process is _supposed_ to do what you see.
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