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Re: [Qemu-devel] [PATCH 1/2] Add a DTrace tracing backend targetted for


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH 1/2] Add a DTrace tracing backend targetted for SystemTAP compatability
Date: Fri, 12 Nov 2010 13:30:11 +0000

On Fri, Nov 12, 2010 at 1:20 PM, Daniel P. Berrange <address@hidden> wrote:
> This introduces a new tracing backend that targets the SystemTAP
> implementation of DTrace userspace tracing. The core functionality
> should be applicable and standard across any DTrace implementation
> on Solaris, OS-X, *BSD, but the Makefile rules will likely need
> some small additional changes to cope with OS specific build
> requirements.
>
> This backend builds a little differently from the other tracing
> backends. Specifically there is no 'trace.c' file, because the
> 'dtrace' command line tool generates a '.o' file directly from
> the dtrace probe definition file. The probe definition is usually
> named with a '.d' extension but QEMU uses '.d' files for its
> external makefile dependancy tracking, so this uses '.dtrace' as
> the extension for the probe definition file.
>
> The 'tracetool' program gains the ability to generate a trace.h
> file for DTrace, and also to generate the trace.d file containing
> the dtrace probe definition.
>
> Example usage of a dtrace probe in systemtap looks like:
>
>  probe process("qemu").mark("qemu_malloc") {
>    printf("Malloc %d %p\n", $arg1, $arg2);
>  }
>
> * .gitignore: Ignore trace-dtrace.*
> * Makefile: Extra rules for generating DTrace files
> * Makefile.obj: Don't build trace.o for DTrace, use
>  trace-dtrace.o generated by 'dtrace' instead
> * tracetool: Support for generating DTrace data files
>
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>  .gitignore    |    2 +
>  Makefile      |   23 +++++++++++
>  Makefile.objs |    4 ++
>  configure     |   14 ++++++-
>  tracetool     |  122 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++-----
>  5 files changed, 154 insertions(+), 11 deletions(-)

Reviewed-by: Stefan Hajnoczi <address@hidden>



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