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utilities: New helper ovs-parse-backtrace.
The new ovs-parse-backtrace utility makes the output of ovs-appctl backtrace more human readable by removing duplicate traces and converting addresses to function names. Signed-off-by: Ethan Jackson <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -18,6 +18,7 @@ | |
| /ovs-lib | ||
| /ovs-ofctl | ||
| /ovs-ofctl.8 | ||
| /ovs-parse-backtrace | ||
| /ovs-parse-leaks | ||
| /ovs-pcap | ||
| /ovs-pcap.1 | ||
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||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,28 @@ | ||
| .TH ovs\-parse\-backtrace 8 "October 2012" "Open vSwitch" "Open vSwitch Manual" | ||
| . | ||
| .SH NAME | ||
| ovs\-parse\-backtrace \- parses ovs-appctl backtrace output | ||
| . | ||
| .SH SYNOPSIS | ||
| \fBovs\-appctl backtrace\fR | \fBovs\-parse\-backtrace\fR [\fIbinary\fR] | ||
| .P | ||
| \fBovs\-parse\-backtrace\fR [\fIbinary\fR] < \fIbacktrace\fR | ||
| . | ||
| .SH DESCRIPTION | ||
| In some configurations, many Open vSwitch daemons can produce a series of | ||
| backtraces using the \fBovs\-appctl backtrace\fR command. Users can analyze | ||
| these backtraces to figure out what the given Open vSwitch daemon may be | ||
| spending most of its time doing. \fBovs\-parse\-backtrace\fR makes this output | ||
| easier to interpret. | ||
| .PP | ||
| The \fBovs\-appctl backtrace\fR output must be supplied on standard input. The | ||
| binary that produced the output should be supplied as the sole non-option | ||
| argument. For best results, the binary should have debug symbols. | ||
| . | ||
| .SH OPTIONS | ||
| .TP | ||
| \fB\-\-help\fR | ||
| Prints a usage message and exits. | ||
| .P | ||
| \fB\-\-version\fR | ||
| Prints the version and exits. |
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| #! @PYTHON@ | ||
| # | ||
| # Copyright (c) 2012 Nicira, Inc. | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at: | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
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| import optparse | ||
| import os | ||
| import re | ||
| import subprocess | ||
| import sys | ||
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| addr2line_cache = {} # None if addr2line is missing or broken. | ||
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| def addr2line(binary, addr): | ||
| global addr2line_cache | ||
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| if addr2line_cache is None: | ||
| return "" | ||
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| if addr in addr2line_cache: | ||
| return addr2line_cache[addr] | ||
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| cmd = ["addr2line", "-f", "-s", "-e", binary, addr] | ||
| try: | ||
| proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, | ||
| stderr=subprocess.PIPE) | ||
| lines = proc.stdout.readlines() | ||
| failed = proc.returncode | ||
| except OSError: | ||
| failed = True | ||
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| if failed: | ||
| addr2line_cache = None | ||
| return "" | ||
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| lines = [l.strip() for l in lines] | ||
| return " ".join(lines) | ||
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| def main(): | ||
| parser = optparse.OptionParser(version='@VERSION@', | ||
| usage="usage: %prog [binary]", | ||
| description="""\ | ||
| Parses the output of ovs-appctl backtrace producing a more human readable | ||
| result. Expected usage is for ovs-appctl backtrace to be piped in.""") | ||
| options, args = parser.parse_args() | ||
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| if len(args) > 1: | ||
| parser.print_help() | ||
| sys.exit(1) | ||
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| if len(args) == 1: | ||
| binary = args[0] | ||
| else: | ||
| binary = "@sbindir@/ovs-vswitchd" | ||
| debug = "/usr/lib/debug%s.debug" % binary | ||
| if os.path.exists(debug): | ||
| binary = debug | ||
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| print "Binary: %s\n" % binary | ||
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| stdin = sys.stdin.read() | ||
| trace_list = stdin.strip().split("\n\n") | ||
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| try: | ||
| #Remove the first line from each trace. | ||
| trace_list = [trace[(trace.index("\n") + 1):] for trace in trace_list] | ||
| except ValueError: | ||
| sys.stdout.write(stdin) | ||
| sys.exit(1) | ||
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| trace_map = {} | ||
| for trace in trace_list: | ||
| trace_map[trace] = trace_map.get(trace, 0) + 1 | ||
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| sorted_traces = sorted(trace_map.items(), key=(lambda x: x[1]), | ||
| reverse=True) | ||
| for trace, count in sorted_traces: | ||
| lines = trace.splitlines() | ||
| longest = max(len(l) for l in lines) | ||
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| print "Backtrace Count: %d" % count | ||
| for line in lines: | ||
| match = re.search(r'\[(0x.*)]', line) | ||
| if match: | ||
| print "%s %s" % (line.ljust(longest), | ||
| addr2line(binary, match.group(1))) | ||
| else: | ||
| print line | ||
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| if __name__ == "__main__": | ||
| main() |
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