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d6b76d6805
This is a partial revert of commit
7f1b588f20 ("trace: emit name <-> ID
mapping in simpletrace header"), which broke the SystemTap flight
recorder because event mapping records may not be present in the ring
buffer when the trace is analyzed. This means simpletrace.py
--no-header does not know the event ID mapping needed to pretty-print
the trace.
Instead of numbering events dynamically, use a static event ID mapping
as dictated by the event order in the trace-events-all file.
The simpletrace.py script also uses trace-events-all so the next patch
will fix the simpletrace.py --no-header option to take advantage of this
knowledge.
Cc: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170815084430.7128-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Generate .stp file that outputs simpletrace binary traces (DTrace with SystemTAP only).
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"""
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__author__ = "Stefan Hajnoczi <redhat.com>"
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__copyright__ = "Copyright (C) 2014, Red Hat, Inc."
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__license__ = "GPL version 2 or (at your option) any later version"
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__maintainer__ = "Stefan Hajnoczi"
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__email__ = "stefanha@redhat.com"
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from tracetool import out
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from tracetool.backend.dtrace import binary, probeprefix
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from tracetool.backend.simple import is_string
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from tracetool.format.stap import stap_escape
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def global_var_name(name):
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return probeprefix().replace(".", "_") + "_" + name
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def generate(events, backend, group):
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out('/* This file is autogenerated by tracetool, do not edit. */',
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'')
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for event_id, e in enumerate(events):
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if 'disable' in e.properties:
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continue
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out('probe %(probeprefix)s.simpletrace.%(name)s = %(probeprefix)s.%(name)s ?',
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'{',
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probeprefix=probeprefix(),
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name=e.name)
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# Calculate record size
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sizes = ['24'] # sizeof(TraceRecord)
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for type_, name in e.args:
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name = stap_escape(name)
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if is_string(type_):
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out(' try {',
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' arg%(name)s_str = %(name)s ? user_string_n(%(name)s, 512) : "<null>"',
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' } catch {}',
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' arg%(name)s_len = strlen(arg%(name)s_str)',
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name=name)
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sizes.append('4 + arg%s_len' % name)
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else:
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sizes.append('8')
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sizestr = ' + '.join(sizes)
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# Generate format string and value pairs for record header and arguments
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fields = [('8b', str(event_id)),
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('8b', 'gettimeofday_ns()'),
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('4b', sizestr),
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('4b', 'pid()')]
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for type_, name in e.args:
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name = stap_escape(name)
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if is_string(type_):
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fields.extend([('4b', 'arg%s_len' % name),
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('.*s', 'arg%s_len, arg%s_str' % (name, name))])
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else:
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fields.append(('8b', name))
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# Emit the entire record in a single SystemTap printf()
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fmt_str = '%'.join(fmt for fmt, _ in fields)
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arg_str = ', '.join(arg for _, arg in fields)
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out(' printf("%%8b%%%(fmt_str)s", 1, %(arg_str)s)',
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fmt_str=fmt_str, arg_str=arg_str)
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out('}')
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out()
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