linux-kernel - Re: Bug in scheduler when using rt

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Message-ID: <1295422865.18384.9.camel@marge.simson.net>
Date:	Wed, 19 Jan 2011 08:41:05 +0100
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yong Zhang <yong.zhang0@...il.com>,
	Peter Zijlstra <peterz@...radead.org>, samu.p.onkalo@...ia.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	tglx <tglx@...utronix.de>
Subject: Re: Bug in scheduler when using rt_mutex

On Wed, 2011-01-19 at 08:19 +0100, Ingo Molnar wrote:
> * Mike Galbraith <efault@....de> wrote:
> 
> > On Wed, 2011-01-19 at 14:09 +0800, Yong Zhang wrote:
> > > On Wed, Jan 19, 2011 at 1:40 PM, Mike Galbraith <efault@....de> wrote:
> > > > On Wed, 2011-01-19 at 12:35 +0800, Yong Zhang wrote:
> > > >
> > > >> cfs_rq->curr != se is always true.
> > > >
> > > > If that were always true, we'd illegally enqueue a running task.
> > > 
> > > I'm sorry that I'm not express myself correctly.
> > 
> > Human communication methods are all buggy as hell :)
> 
> Not to mention that they are slow, inefficient and ambiguous.
> 
> But wht did you expect? The original authors of the code are long gone and 
> maintenance is done by newcomers who are patching the code bit by bit. What
> you get from such a development model is pretty predictable: ~1 billion years
> old spaghetti DNA that no-one truly understands.

Gotta give the original authors credit though, their self modifying code
comes equipped with a fully automated hardware break-point debugger.

	-Mike

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