Merge "Log debuggerd -j output when sampling memory use."

You can manually run the test as follows:

  make tradefed-all system-memory-test SystemMemoryTestDevice

  tradefed.sh run commandAndExit template/local_min --template:map test=system-memory-test

  atest -v system-memory-test

This installs and runs the test on device. You can see the metrics in the

tradefed output.

        this.logs = logs;

    }

    /**

     * Writes the given <code>text</code> to a log with the given label.

     */

    private void logText(String label, String text) throws IOException {

      File file = File.createTempFile(label, "txt");

      PrintStream ps = new PrintStream(file);

      ps.print(text);

      try (FileInputStreamSource dataStream = new FileInputStreamSource(file)) {

        logs.addTestLog(label, LogDataType.TEXT, dataStream);

      }

    }

    /**

     * Returns the pid for the process with the given name.

     */

        // Read showmap for system server and add it as a test log

        String showmap = device.executeShellCommand("showmap " + pid);

        String showmapLabel = label + ".system_server.showmap";

        File file = File.createTempFile(showmapLabel, "txt");

        PrintStream ps = new PrintStream(file);

        ps.print(showmap);

        try (FileInputStreamSource dataStream = new FileInputStreamSource(file)) {

            logs.addTestLog(showmapLabel, LogDataType.TEXT, dataStream);

        }

        logText(label + ".system_server.showmap", showmap);

        // Extract VSS, PSS and RSS from the showmap and output them as metrics.

        // The last lines of the showmap output looks something like:

            throw new MetricsException("unexpected showmap format", e);

        }

        // Run debuggerd -j to get GC stats for system server and add it as a

        // test log

        String debuggerd = device.executeShellCommand("debuggerd -j " + pid);

        logText(label + ".system_server.debuggerd", debuggerd);

        // TODO: Experiment with other additional metrics.

        // TODO: Consider launching an instrumentation to collect metrics from