title: How often are utime and stime fields in /proc/<pid>/task/<tid>/stat updated?
body: <p>When I repeatedly check the values in <code>/proc/&lt;pid&gt;/task/&lt;tid&gt;/stat</code> on a Linux with kernel version > 2.6.2, where <code>&lt;pid&gt;</code> is a process ID, and <code>&lt;tid&gt;</code> is a thread ID, I noticed that the fields utime and stime (#14 and #15) did not change every time. Do you know what rules the kernel uses to decide how often the thread stats is updated? Or is there anyway to check it? </p>