iotop: add page (#3454)

pages/common/iotop.md

@@ -0,0 +1,32 @@
+# iotop
+
+> Display a table of current I/O usage by processes or threads.
+> More information: <https://linux.die.net/man/1/iotop>.
+
+- Start top-like I/O monitor:
+
+`iotop`
+
+- Show only processes or threads actually doing I/O:
+
+`iotop -o`
+
+- Show I/O usage in non-interactive mode:
+
+`iotop -b`
+
+- Show only I/O usage of processes(Default is to show all threads):
+
+`iotop -P`
+
+- Show I/O usage of given PID(s):
+
+`iotop -p {{PID}}`
+
+- Show I/O usage of a given user:
+
+`iotop -u {{user}}`
+
+- Show accumulated I/O instead of bandwidth:
+
+`iotop -a`