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

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Message-Id: <E1Ixnla-0002Ey-By@dorka.pomaz.szeredi.hu>
Date:	Thu, 29 Nov 2007 19:05:38 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	mingo@...e.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)

> > > 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.

I still don't know what mcount_enabled=1 should do.  I didn't see any
difference in the trace after enabling it.

Miklos
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