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[Qemu-devel] Re: [RFC 0/5] Tracing backends

From: Jan Kiszka
Subject: [Qemu-devel] Re: [RFC 0/5] Tracing backends
Date: Sun, 23 May 2010 17:48:10 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

Stefan Hajnoczi wrote:
> The following patches against qemu.git allow static trace events to be 
> declared
> in QEMU.  Trace events use a lightweight syntax and are independent of the
> backend tracing system (e.g. LTTng UST).
> Supported backends are:
>  * my trivial tracer ("simple")
>  * LTTng Userspace Tracer ("ust")
>  * no tracer ("nop", the default)
> The ./configure option to choose a backend is --trace-backend=.
> Main point of this patchset: adding new trace events is easy and we can switch
> between backends without modifying the code.
> Prerna: Would you like to add your tracing system as a backend?  This would be
> similar to my patches to add "simple" and "ust" backend support.
> Jan: Adding kernel marker backend support should be straightforward if you are
> interested.
> These patches are also available at:
> http://repo.or.cz/w/qemu/stefanha.git/shortlog/refs/heads/tracing

Nice! Will have a closer look once timer permits, specifically to check
how ftrace can be added to this. Looks indeed straightforward on first


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