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

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Message-Id: <E1IxMfh-0006fN-HQ@dorka.pomaz.szeredi.hu>
Date:	Wed, 28 Nov 2007 14:09:45 +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: -rt doesn't compile for UML

> * Miklos Szeredi <miklos@...redi.hu> wrote:
> 
> > When writing a big file to a ubd disk, everything in uml slows down to
> > a crawl, even though CPU usage is minimal.
> > 
> > So I wanted to try the latency tracer from -rt, but it doesn't compile 
> > with UML:
> 
> note that there are standalone patches as well:
> 
>  http://people.redhat.com/mingo/latency-tracing-patches/
> 
> so there's no forced need to use -rt.

Ah, forgotten about that.

Unfortunately the latency tracer patch doesn't compile either:

  CC      kernel/latency_trace.o
kernel/latency_trace.c:28:21: error: asm/rtc.h: No such file or directory
kernel/latency_trace.c:63:3: error: #error Implement cycles_to_usecs.
kernel/latency_trace.c: In function ‘____trace’:
kernel/latency_trace.c:658: error: implicit declaration of function ‘irqs_disabled_flags’
make[1]: *** [kernel/latency_trace.o] Error 1

Miklos
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