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File: //usr/lib/python3/dist-packages/landscape/lib/__pycache__/process.cpython-38.pyc
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    @param proc_dir: The directory to use for process information.
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    @param uptime: The uptime value to use (for unit tests only).
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        Parse the /proc/<pid>/cmdline and /proc/<pid>/status files for
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    Implement ps' algorithm to calculate the percentage cpu utilisation for a
    process.::

    unsigned long long total_time;   /* jiffies used by this process */
    unsigned pcpu = 0;               /* scaled %cpu, 99 means 99% */
    unsigned long long seconds;      /* seconds of process life */
    total_time = pp->utime + pp->stime;
    if(include_dead_children) total_time += (pp->cutime + pp->cstime);
    seconds = seconds_since_boot - pp->start_time / hertz;
    if(seconds) pcpu = (total_time * 100ULL / hertz) / seconds;
    if (pcpu > 99U) pcpu = 99U;
    return snprintf(outbuf, COLWID, "%2u", pcpu);
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