linux-kernel - Re: -rt doesn't compile for UML

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Message-ID: <20071128170213.GA23606@elte.hu>
Date:	Wed, 28 Nov 2007 18:02:13 +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: -rt doesn't compile for UML


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

> > so you can define irqs_off_flags to always-0 and you should be able 
> > to get pretty good traces still. It should have no functional 
> > impact.
> 
> OK, managed to make it compile, but then something goes wrong in 
> tracer_alloc_bootmem().

try with a lower MAX_TRACE first - 1 million entries (default) uses up 
like 32 MB of RAM per CPU, that might be quite a bit and your UML image 
might not be able to take that.

also, you can do a s/trace_alloc_bootmem/alloc_bootmem - the 
alloc-bootmem wrapping was only done to get the tracer boot with really 
ridiculously high MAX_TRACE.

	Ingo
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