LTTng » LTTng-tools

Suggestion to add an option to some lttng commands to get the output in XML/JSON/other standard format for easier automated parsing.

Example:

# lttng list --json auto-20120619-131154
{
  kernel: {
    "channel0": {
      enabled: true,
      attributes: {
        overwriteMode: 0,
        subbuffers: {
          count: 4,
          size: 262144
        },
        switchTimerInterval: 0,
        readTimerInterval: 200,
        output: "splice()" 
      },
      events: {
        syscalls: {
          enabled: true
        },
        tracepoints: {
          "block_rq_remap": {
            logLevel: {
              name: "TRACE_EMERG",
              value: 0
            },
            enabled: true
          },
          "irq_handler_exit": {
            logLevel: {
              name: "TRACE_EMERG",
              value: 0
            },
            enabled: true
          },
          "timer_start": {
            logLevel: {
              name: "TRACE_EMERG",
              value: 0
            },
            enabled: false
          }
        }
      }
    }
  }
}

# lttng list --xml auto-20120619-131154
<?xml version="1.0" encoding="utf-8" ?>
<kernel>
  <channel name="channel0" enabled="true">
    <attributes>
      <attr name="overwriteMode" value="0" />
      <attr name="subbuffersCount" value="4" />
      <attr name="subbuffersSize" value="262144" />
      <attr name="switchTimerInterval" value="0" />
      <attr name="readTimerInterval" value="200" />
      <attr name="output" value="splice()" />
    </attributes>
    <events>
      <syscalls enabled="true" />
      <tracepoints>
        <event name="block_rq_remap" enabled="true">
          <loglevel name="TRACE_EMERG" value="0" />
        </event>
        <event name="irq_handler_exit" enabled="true">
          <loglevel name="TRACE_EMERG" value="0" />
        </event>
        <event name="timer_start" enabled="false">
          <loglevel name="TRACE_EMERG" value="0" />
        </event>
      </tracepoints>
    </events>
  </channel>
</kernel>