linux-kernel - Re: Keys get stuck

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Date:	Wed, 12 Mar 2008 17:49:22 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	David Newall <davidn@...idnewall.com>
cc:	Theodore Tso <tytso@....edu>, "Fred ." <eldmannen@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Keys get stuck

On Thu, 13 Mar 2008, David Newall wrote:

> > The problem is that under heavy load the auto-repeat problem is real; 
> > I've seen it as well, and it means that I've started to try to avoid 
> > "make -j4" since that's a great way to trigger it.
> I'm sure it does suck under heavy load, although I suppose you could
> increase the start time.  But I wonder if that is the problem this
> time?  Modern machines are so damned fast they actually take real effort
> to load.  Actually, "make -j4" doesn't sound particularly heavy. 
> There's huge disk i/o in a make.  Plenty of scheduling opportunities. 
> Obviously I only know what everybody else here knows; but with so many
> recent posts suggesting a scheduling fault has been introduced, I'm
> expecting it to be that.

The problem became much more apparent during early -rc phase of 2.6.25 for 
those people that have CONFIG_GROUP_SCHED turned on. This clearly shows 
that X are somehow unhappy with how kernel schedules them, but I don't 
have idea how autorepeat is implemented inside X and what could be the 
problem right now.

-- 
Jiri Kosina
SUSE Labs
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