Merge "Install psutil required by tools/mlock_report.py script"

Author: Zuul

lib/dstat

@@ -9,13 +9,22 @@
 
 # ``stack.sh`` calls the entry points in this order:
 #
+# - install_dstat
 # - start_dstat
 # - stop_dstat
 
 # Save trace setting
 _XTRACE_DSTAT=$(set +o | grep xtrace)
 set +o xtrace
 
+# install_dstat() - Install prerequisites for dstat services
+function install_dstat {
+    if is_service_enabled memory_tracker; then
+        # Install python libraries required by tools/mlock_report.py
+        pip_install_gr psutil
+    fi
+}
+
 # start_dstat() - Start running processes
 function start_dstat {
     # A better kind of sysstat, with the top process per time slice

stack.sh

@@ -867,6 +867,13 @@ if is_service_enabled tls-proxy; then
     init_cert
 fi
 
+# Dstat
+# -----
+
+# Install dstat services prerequisites
+install_dstat
+
+
 # Check Out and Install Source
 # ----------------------------