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path: root/scripts/tracetool/backend/__init__.py
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* trace: add TRACE_<event>_BACKEND_DSTATE()Stefan Hajnoczi2017-08-011-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | QEMU keeps track of trace event enabled/disabled state and provides monitor commands to inspect and modify the "dstate". SystemTap and LTTng UST maintain independent enabled/disabled states for each trace event, the other backends rely on QEMU dstate. Introduce a new per-event macro that combines backend-specific dstate like this: #define TRACE_MY_EVENT_BACKEND_DSTATE() ( \ QEMU_MY_EVENT_ENABLED() || /* SystemTap */ \ tracepoint_enabled(qemu, my_event) /* LTTng UST */ || \ false) This will be used to extend trace_event_get_state() in the next patch. [Daniel Berrange pointed out that QEMU_MY_EVENT_ENABLED() must be true by default, not false. This way events will fire even if the DTrace implementation does not implement the SystemTap semaphores feature. Ubuntu Precise uses lttng-ust-dev 2.0.2 which does not have tracepoint_enabled(), so we need a compatibility wrapper to keep Travis builds passing. --Stefan] Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20170731140718.22010-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> fixup! trace: add TRACE_<event>_BACKEND_DSTATE()
* trace: introduce a formal group name for trace eventsDaniel P. Berrange2016-10-121-6/+6
| | | | | | | | | | | | | | | | | | | | | | | The declarations in the generated-tracers.h file are assuming there's only ever going to be one instance of this header, as they are not namespaced. When we have one header per event group, if a single source file needs to include multiple sets of trace events, the symbols will all clash. This change thus introduces a '--group NAME' arg to the 'tracetool' program. This will cause all the symbols in the generated header files to be given a unique namespace. If no group is given, the group name 'common' is used, which is suitable for the current usage where there is only one global trace-events file used for code generation. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu> Message-id: 1475588159-30598-21-git-send-email-berrange@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* trace: avoid Python 2.5 all() in tracetoolStefan Hajnoczi2014-08-281-1/+2
| | | | | | | | Red Hat Enterprise Linux 5 ships Python 2.4.3. The all() function was added in Python 2.5 so we cannot use it. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com>
* trace: Multi-backend tracingLluís Vilanova2014-06-091-7/+8
| | | | | | | | | | | | | | | Adds support to compile QEMU with multiple tracing backends at the same time. For example, you can compile QEMU with: $ ./configure --enable-trace-backends=ftrace,dtrace Where 'ftrace' can be handy for having an in-flight record of events, and 'dtrace' can be later used to extract more information from the system. This patch allows having both available without recompiling QEMU. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* trace: [tracetool] Minimize the amount of per-backend codeLluís Vilanova2014-05-071-40/+32Star
| | | | | | | Backends now only contain the essential backend-specific code, and most of the work is moved to frontend code. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* trace: [tracetool] Show list of frontends and backends sorted by nameLluís Vilanova2014-05-071-1/+1
| | | | | Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* trace: [tracetool] Explicitly identify public backendsLluís Vilanova2013-03-281-1/+15
| | | | | | | | Public backends are those printed by "--list-backends" and thus considered valid by the configure script. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* tracetool: avoid pkgutil.iter_modules() Python 2.7 functionStefan Hajnoczi2012-05-011-2/+6
| | | | | | | | | The pkgutil.iter_modules() function provides a way to enumerate child modules. Unfortunately it's missing in Python <2.7 so we must implement similar behavior ourselves. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu>
* tracetool: Rewrite infrastructure as python modulesLluís Vilanova2012-04-181-0/+111
The tracetool script is written in shell and has hit several portability problems due to shell quirks or external tools across host platforms. Additionally the amount of string processing and lack of real data structures makes it tough to implement code generator backends for tracers that are more complex. This patch replaces the shell version of tracetool with a Python version. The new tracetool design is: scripts/tracetool.py - top-level script scripts/tracetool/backend/ - tracer backends live here (simple, ust) scripts/tracetool/format/ - output formats live here (.c, .h) There is common code for trace-events definition parsing so that backends can focus on generating code rather than parsing input. Support for all existing backends (nop, stderr, simple, ust, and dtrace) is added back in follow-up patches. [Commit description written by Stefan Hajnoczi] Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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