linux-kernel - Re: scheduling anomaly on uml (was: -rt doesn't compile for UML)

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Message-ID: <20071129162556.GA4268@elte.hu>
Date:	Thu, 29 Nov 2007 17:25:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	jdike@...toit.com, user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: scheduling anomaly on uml (was: -rt doesn't compile for UML)


* Miklos Szeredi <miklos@...redi.hu> wrote:

> > to get symbolic stack backdumps for the wakeup points, and add 
> > trace_special_sym() calls to generate extra stackdump entries at 
> > arbitrary places. schedule() does not have it right now - it might 
> > make sense to add it.
> 
> OK, this helped.
> 
> It looks like the delays are caused by the page allocator, and not 
> UML.  Which is good news, because I'm supposed to understand memory 
> management better than scheduling.

heh :-) Scheduling isnt hard either - and looking at traces (especially 
with mcount_enabled=1) certainly helps.

	Ingo
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