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authorStefan Hajnoczi <stefanha@redhat.com>2014-06-22 21:46:05 +0800
committerStefan Hajnoczi <stefanha@redhat.com>2014-08-12 14:26:11 +0100
commit3f8b112d6b9ab65e165096582c78154dda1adc69 (patch)
tree052097276ce312b408517fe4ac7748f79b2db0a3 /scripts/tracetool
parenta76ccf3c1cb06576af091c5ac8bc264515b1bb7f (diff)
trace: add tracetool simpletrace_stap format
This new tracetool "format" generates a SystemTap .stp file that outputs simpletrace binary trace data. In contrast to simpletrace or ftrace, SystemTap does not define its own trace format. All output from SystemTap is generated by .stp files. This patch lets us generate a .stp file that outputs in the simpletrace binary format. This makes it possible to reuse simpletrace.py to analyze traces recorded using SystemTap. The simpletrace binary format is especially useful for long-running traces like flight-recorder mode where string formatting can be expensive. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'scripts/tracetool')
-rw-r--r--scripts/tracetool/format/simpletrace_stap.py71
1 files changed, 71 insertions, 0 deletions
diff --git a/scripts/tracetool/format/simpletrace_stap.py b/scripts/tracetool/format/simpletrace_stap.py
new file mode 100644
index 0000000000..7e44bc1811
--- /dev/null
+++ b/scripts/tracetool/format/simpletrace_stap.py
@@ -0,0 +1,71 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Generate .stp file that outputs simpletrace binary traces (DTrace with SystemTAP only).
+"""
+
+__author__ = "Stefan Hajnoczi <redhat.com>"
+__copyright__ = "Copyright (C) 2014, Red Hat, Inc."
+__license__ = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__ = "stefanha@redhat.com"
+
+
+from tracetool import out
+from tracetool.backend.dtrace import binary, probeprefix
+from tracetool.backend.simple import is_string
+from tracetool.format.stap import stap_escape
+
+
+def generate(events, backend):
+ out('/* This file is autogenerated by tracetool, do not edit. */',
+ '')
+
+ for event_id, e in enumerate(events):
+ if 'disable' in e.properties:
+ continue
+
+ out('probe %(probeprefix)s.simpletrace.%(name)s = %(probeprefix)s.%(name)s ?',
+ '{',
+ probeprefix=probeprefix(),
+ name=e.name)
+
+ # Calculate record size
+ sizes = ['24'] # sizeof(TraceRecord)
+ for type_, name in e.args:
+ name = stap_escape(name)
+ if is_string(type_):
+ out(' try {',
+ ' arg%(name)s_str = %(name)s ? user_string_n(%(name)s, 512) : "<null>"',
+ ' } catch {}',
+ ' arg%(name)s_len = strlen(arg%(name)s_str)',
+ name=name)
+ sizes.append('4 + arg%s_len' % name)
+ else:
+ sizes.append('8')
+ sizestr = ' + '.join(sizes)
+
+ # Generate format string and value pairs for record header and arguments
+ fields = [('8b', str(event_id)),
+ ('8b', 'gettimeofday_ns()'),
+ ('4b', sizestr),
+ ('4b', 'pid()')]
+ for type_, name in e.args:
+ name = stap_escape(name)
+ if is_string(type_):
+ fields.extend([('4b', 'arg%s_len' % name),
+ ('.*s', 'arg%s_len, arg%s_str' % (name, name))])
+ else:
+ fields.append(('8b', name))
+
+ # Emit the entire record in a single SystemTap printf()
+ fmt_str = '%'.join(fmt for fmt, _ in fields)
+ arg_str = ', '.join(arg for _, arg in fields)
+ out(' printf("%%%(fmt_str)s", %(arg_str)s)',
+ fmt_str=fmt_str, arg_str=arg_str)
+
+ out('}')
+
+ out()