trace: Multi-backend tracing
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>
diff --git a/scripts/tracetool.py b/scripts/tracetool.py
index 5f4890f..83bde7b 100755
--- a/scripts/tracetool.py
+++ b/scripts/tracetool.py
@@ -6,7 +6,7 @@
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__ = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -32,7 +32,7 @@
format_descr = "\n".join([ " %-15s %s" % (n, d)
for n,d in tracetool.format.get_list() ])
error_write("""\
-Usage: %(script)s --format=<format> --backend=<backend> [<options>]
+Usage: %(script)s --format=<format> --backends=<backends> [<options>]
Backends:
%(backends)s
@@ -43,7 +43,7 @@
Options:
--help This help message.
--list-backends Print list of available backends.
- --check-backend Check if the given backend is valid.
+ --check-backends Check if the given backend is valid.
--binary <path> Full path to QEMU binary.
--target-type <type> QEMU emulator target type ('system' or 'user').
--target-name <name> QEMU emulator target name.
@@ -65,16 +65,17 @@
global _SCRIPT
_SCRIPT = args[0]
- long_opts = [ "backend=", "format=", "help", "list-backends", "check-backend" ]
- long_opts += [ "binary=", "target-type=", "target-name=", "probe-prefix=" ]
+ long_opts = ["backends=", "format=", "help", "list-backends",
+ "check-backends"]
+ long_opts += ["binary=", "target-type=", "target-name=", "probe-prefix="]
try:
opts, args = getopt.getopt(args[1:], "", long_opts)
except getopt.GetoptError, err:
error_opt(str(err))
- check_backend = False
- arg_backend = ""
+ check_backends = False
+ arg_backends = []
arg_format = ""
binary = None
target_type = None
@@ -84,8 +85,8 @@
if opt == "--help":
error_opt()
- elif opt == "--backend":
- arg_backend = arg
+ elif opt == "--backends":
+ arg_backends = arg.split(",")
elif opt == "--format":
arg_format = arg
@@ -93,8 +94,8 @@
public_backends = tracetool.backend.get_list(only_public = True)
out(", ".join([ b for b,_ in public_backends ]))
sys.exit(0)
- elif opt == "--check-backend":
- check_backend = True
+ elif opt == "--check-backends":
+ check_backends = True
elif opt == "--binary":
binary = arg
@@ -108,14 +109,14 @@
else:
error_opt("unhandled option: %s" % opt)
- if arg_backend is None:
- error_opt("backend not set")
+ if len(arg_backends) == 0:
+ error_opt("no backends specified")
- if check_backend:
- if tracetool.backend.exists(arg_backend):
- sys.exit(0)
- else:
- sys.exit(1)
+ if check_backends:
+ for backend in arg_backends:
+ if not tracetool.backend.exists(backend):
+ sys.exit(1)
+ sys.exit(0)
if arg_format == "stap":
if binary is None:
@@ -126,11 +127,11 @@
error_opt("--target-name is required for SystemTAP tapset generator")
if probe_prefix is None:
- probe_prefix = ".".join([ "qemu", target_type, target_name ])
+ probe_prefix = ".".join(["qemu", target_type, target_name])
try:
- tracetool.generate(sys.stdin, arg_format, arg_backend,
- binary = binary, probe_prefix = probe_prefix)
+ tracetool.generate(sys.stdin, arg_format, arg_backends,
+ binary=binary, probe_prefix=probe_prefix)
except tracetool.TracetoolError, e:
error_opt(str(e))