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Linux Trace Toolkit Viewer User Guide | ||
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Prev | Chapter 4. Using LTTV text modules |
The goal of this module is to convert the binary data of the traces into -a formatted text file. -
The text dump module is a good example of a usage of the batch analysis module -backend. In fact, the text dump module depends on it. You don't need to -explicitly load the batchAnalysis module though, as lttv offers a rich module -backend that deals with the dependencies, loading the module automatically if -needed. -
The text dump module is invoked just like the batchAnalysis module. It adds more -options that can be specified in argument. You may specify the -o switch for the -output file name of the text dump. You can enable the output of the field names -(the identifier of the fields) with the -l switch. The -s switch, for process -states, is very useful to indicate the state in which the process is when the -event happens. -
If you use the --help option on the textDump module, you will see all the detail -about the switches that can be used to show per cpu statistics and per process -statistics. You will notice that you can use both the switches for the -batchAnalysis module and those for textDump. You will also notice that the -options --process_state (from textDump) and --stats (from batchAnalysis) has the -same short name "-s". If you choose to invoke this option using the short name, -it will use the option of the last module loaded just before the -s switch. -
For exemple, if you load the textDump module with -m textDump, it will first -load the batchAnalysis module, and then load itself. As it is the last module -loaded, the -s switch used after it will signify --process_stats. On the other -hand, if you choose to specify explicitly the loading of both modules like this -: -
$ lttv -L path/to/lib/plugins -m batchAnalysis -s\ --m textDump -s -t trace -
The first "-s" will invoke batchAnalysis --stats and the second "-s" will invoke -textDump --process_state. The list of options generated by --help follows the -order of registration of the options by the modules, therefore the invocation -order of the modules. -