@@ -318,7 +318,8 @@ probes:
--target-type system \
--target-name x86_64 \
--group=all \
- trace-events-all >qemu.stp
+ trace-events-all \
+ qemu.stp
To facilitate simple usage of systemtap where there merely needs to be printf
logging of certain probes, a helper script "qemu-trace-stap" is provided.
@@ -1037,7 +1037,6 @@ foreach target : target_dirs
custom_target(exe_name + stp['ext'],
input: trace_events_all,
output: exe_name + stp['ext'],
- capture: true,
install: stp['install'],
install_dir: config_host['qemu_datadir'] / '../systemtap/tapset',
command: [
@@ -1046,7 +1045,7 @@ foreach target : target_dirs
'--target-name=' + target_name,
'--target-type=' + target_type,
'--probe-prefix=qemu.' + target_type + '.' + target_name,
- '@INPUT@',
+ '@INPUT@', '@OUTPUT@'
])
endforeach
endif
@@ -16,7 +16,7 @@ __email__ = "stefanha@redhat.com"
import sys
import getopt
-from tracetool import error_write, out
+from tracetool import error_write, out, out_open
import tracetool.backend
import tracetool.format
@@ -32,7 +32,7 @@ def error_opt(msg = None):
format_descr = "\n".join([ " %-15s %s" % (n, d)
for n,d in tracetool.format.get_list() ])
error_write("""\
-Usage: %(script)s --format=<format> --backends=<backends> [<options>]
+Usage: %(script)s --format=<format> --backends=<backends> [<options>] <trace-events> ... <output>
Backends:
%(backends)s
@@ -135,13 +135,15 @@ def main(args):
if probe_prefix is None:
probe_prefix = ".".join(["qemu", target_type, target_name])
- if len(args) < 1:
- error_opt("missing trace-events filepath")
+ if len(args) < 2:
+ error_opt("missing trace-events and output filepaths")
events = []
- for arg in args:
+ for arg in args[:-1]:
with open(arg, "r") as fh:
events.extend(tracetool.read_events(fh, arg))
+ out_open(args[-1])
+
try:
tracetool.generate(events, arg_group, arg_format, arg_backends,
binary=binary, probe_prefix=probe_prefix)
@@ -31,14 +31,28 @@ def error(*lines):
sys.exit(1)
+out_filename = '<none>'
+out_fobj = sys.stdout
+
+def out_open(filename):
+ global out_filename, out_fobj
+ out_filename = filename
+ out_fobj = open(filename, 'wt')
+
def out(*lines, **kwargs):
"""Write a set of output lines.
You can use kwargs as a shorthand for mapping variables when formating all
the strings in lines.
+
+ The 'out_filename' kwarg is automatically added with the output filename.
"""
- lines = [ l % kwargs for l in lines ]
- sys.stdout.writelines("\n".join(lines) + "\n")
+ output = []
+ for l in lines:
+ kwargs['out_filename'] = out_filename
+ output.append(l % kwargs)
+
+ out_fobj.writelines("\n".join(output) + "\n")
# We only want to allow standard C types or fixed sized
# integer types. We don't want QEMU specific types
@@ -11,20 +11,17 @@ foreach dir : [ '.' ] + trace_events_subdirs
trace_h = custom_target(fmt.format('trace', 'h'),
output: fmt.format('trace', 'h'),
input: trace_events_file,
- command: [ tracetool, group, '--format=h', '@INPUT@' ],
- capture: true)
+ command: [ tracetool, group, '--format=h', '@INPUT@', '@OUTPUT@' ])
genh += trace_h
trace_c = custom_target(fmt.format('trace', 'c'),
output: fmt.format('trace', 'c'),
input: trace_events_file,
- command: [ tracetool, group, '--format=c', '@INPUT@' ],
- capture: true)
+ command: [ tracetool, group, '--format=c', '@INPUT@', '@OUTPUT@' ])
if 'CONFIG_TRACE_UST' in config_host
trace_ust_h = custom_target(fmt.format('trace-ust', 'h'),
output: fmt.format('trace-ust', 'h'),
input: trace_events_file,
- command: [ tracetool, group, '--format=ust-events-h', '@INPUT@' ],
- capture: true)
+ command: [ tracetool, group, '--format=ust-events-h', '@INPUT@', '@OUTPUT@' ])
trace_ss.add(trace_ust_h, lttng, urcubp)
genh += trace_ust_h
endif
@@ -33,8 +30,7 @@ foreach dir : [ '.' ] + trace_events_subdirs
trace_dtrace = custom_target(fmt.format('trace-dtrace', 'dtrace'),
output: fmt.format('trace-dtrace', 'dtrace'),
input: trace_events_file,
- command: [ tracetool, group, '--format=d', '@INPUT@' ],
- capture: true)
+ command: [ tracetool, group, '--format=d', '@INPUT@', '@OUTPUT@' ])
trace_dtrace_h = custom_target(fmt.format('trace-dtrace', 'h'),
output: fmt.format('trace-dtrace', 'h'),
input: trace_dtrace,
@@ -66,9 +62,8 @@ foreach d : [
gen = custom_target(d[0],
output: d[0],
input: meson.source_root() / 'trace-events',
- command: [ tracetool, '--group=root', '--format=@0@'.format(d[1]), '@INPUT@' ],
- build_by_default: true, # to be removed when added to a target
- capture: true)
+ command: [ tracetool, '--group=root', '--format=@0@'.format(d[1]), '@INPUT@', '@OUTPUT@' ],
+ build_by_default: true) # to be removed when added to a target
specific_ss.add(gen)
endforeach
@@ -76,13 +71,11 @@ if 'CONFIG_TRACE_UST' in config_host
trace_ust_all_h = custom_target('trace-ust-all.h',
output: 'trace-ust-all.h',
input: trace_events_files,
- command: [ tracetool, '--group=all', '--format=ust-events-h', '@INPUT@' ],
- capture: true)
+ command: [ tracetool, '--group=all', '--format=ust-events-h', '@INPUT@', '@OUTPUT@' ])
trace_ust_all_c = custom_target('trace-ust-all.c',
output: 'trace-ust-all.c',
input: trace_events_files,
- command: [ tracetool, '--group=all', '--format=ust-events-c', '@INPUT@' ],
- capture: true)
+ command: [ tracetool, '--group=all', '--format=ust-events-c', '@INPUT@', '@OUTPUT@' ])
trace_ss.add(trace_ust_all_h, trace_ust_all_c)
genh += trace_ust_all_h
endif
The tracetool.py script writes to stdout. This means the output filename is not available to the script. Add the output filename to the command-line so that the script has access to the filename. This also simplifies the tracetool.py invocation. It's no longer necessary to use meson's custom_build(capture : true) to save output. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- docs/devel/tracing.txt | 3 ++- meson.build | 3 +-- scripts/tracetool.py | 12 +++++++----- scripts/tracetool/__init__.py | 18 ++++++++++++++++-- trace/meson.build | 23 ++++++++--------------- 5 files changed, 34 insertions(+), 25 deletions(-)