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trace: Multi-backend tracing

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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>
This commit is contained in:
Lluís Vilanova 2014-05-27 15:02:14 +02:00 • committed by Stefan Hajnoczi
parent 82432638eb
commit 5b808275f3
20 changed files with 152 additions and 233 deletions
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22
scripts/tracetool/__init__.py
View file

@ -233,9 +233,9 @@ def try_import(mod_name, attr_name=None, attr_default=None):
return False, None
def generate(fevents, format, backend,
def generate(fevents, format, backends,
binary=None, probe_prefix=None):
"""Generate the output for the given (format, backend) pair.
"""Generate the output for the given (format, backends) pair.
Parameters
----------
@ -243,8 +243,8 @@ def generate(fevents, format, backend,
Event description file.
format : str
Output format name.
backend : str
Output backend name.
backends : list
Output backend names.
binary : str or None
See tracetool.backend.dtrace.BINARY.
probe_prefix : str or None
@ -258,15 +258,13 @@ def generate(fevents, format, backend,
raise TracetoolError("format not set")
if not tracetool.format.exists(format):
raise TracetoolError("unknown format: %s" % format)
format = format.replace("-", "_")
backend = str(backend)
if len(backend) is 0:
raise TracetoolError("backend not set")
if not tracetool.backend.exists(backend):
raise TracetoolError("unknown backend: %s" % backend)
backend = backend.replace("-", "_")
backend = tracetool.backend.Wrapper(backend, format)
if len(backends) is 0:
raise TracetoolError("no backends specified")
for backend in backends:
if not tracetool.backend.exists(backend):
raise TracetoolError("unknown backend: %s" % backend)
backend = tracetool.backend.Wrapper(backends, format)
import tracetool.backend.dtrace
tracetool.backend.dtrace.BINARY = binary

15
scripts/tracetool/backend/__init__.py
View file

@ -99,17 +99,18 @@ def exists(name):
class Wrapper:
def __init__(self, backend, format):
self._backend = backend.replace("-", "_")
def __init__(self, backends, format):
self._backends = [backend.replace("-", "_") for backend in backends]
self._format = format.replace("-", "_")
assert exists(self._backend)
assert all(exists(backend) for backend in self._backends)
assert tracetool.format.exists(self._format)
def _run_function(self, name, *args, **kwargs):
func = tracetool.try_import("tracetool.backend." + self._backend,
name % self._format, None)[1]
if func is not None:
func(*args, **kwargs)
for backend in self._backends:
func = tracetool.try_import("tracetool.backend." + backend,
name % self._format, None)[1]
if func is not None:
func(*args, **kwargs)
def generate_begin(self, events):
self._run_function("generate_%s_begin", events)