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@param proc_dir: The directory to use for process information.
@param jiffies: The value to use for jiffies per second.
@param boot_time: An alternate value to use for the last boot time. If
None, the system last boot time will be used.
@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
information about the running process with process_id.
The /proc filesystem doesn't behave like ext2, open files can disappear
during the read process.
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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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