diff --git a/functions-common b/functions-common
index f299ef1cc9..e16bb27ef5 100644
--- a/functions-common
+++ b/functions-common
@@ -1564,6 +1564,7 @@ function write_user_unit_file {
     local command="$2"
     local group=$3
     local user=$4
+    local env_vars="$5"
     local extra=""
     if [[ -n "$group" ]]; then
         extra="Group=$group"
@@ -1577,6 +1578,9 @@ function write_user_unit_file {
     iniset -sudo $unitfile "Service" "KillMode" "process"
     iniset -sudo $unitfile "Service" "TimeoutStopSec" "300"
     iniset -sudo $unitfile "Service" "ExecReload" "$KILL_PATH -HUP \$MAINPID"
+    if [[ -n "$env_vars" ]] ; then
+        iniset -sudo $unitfile "Service" "Environment" "$env_vars"
+    fi
     if [[ -n "$group" ]]; then
         iniset -sudo $unitfile "Service" "Group" "$group"
     fi
@@ -1591,6 +1595,7 @@ function write_uwsgi_user_unit_file {
     local command="$2"
     local group=$3
     local user=$4
+    local env_vars="$5"
     local unitfile="$SYSTEMD_DIR/$service"
     mkdir -p $SYSTEMD_DIR
 
@@ -1605,6 +1610,9 @@ function write_uwsgi_user_unit_file {
     iniset -sudo $unitfile "Service" "NotifyAccess" "all"
     iniset -sudo $unitfile "Service" "RestartForceExitStatus" "100"
 
+    if [[ -n "$env_vars" ]] ; then
+        iniset -sudo $unitfile "Service" "Environment" "$env_vars"
+    fi
     if [[ -n "$group" ]]; then
         iniset -sudo $unitfile "Service" "Group" "$group"
     fi
@@ -1652,10 +1660,14 @@ function _run_under_systemd {
     local systemd_service="devstack@$service.service"
     local group=$3
     local user=${4:-$STACK_USER}
+    if [[ -z "$user" ]]; then
+        user=$STACK_USER
+    fi
+    local env_vars="$5"
     if [[ "$command" =~ "uwsgi" ]] ; then
-        write_uwsgi_user_unit_file $systemd_service "$cmd" "$group" "$user"
+        write_uwsgi_user_unit_file $systemd_service "$cmd" "$group" "$user" "$env_vars"
     else
-        write_user_unit_file $systemd_service "$cmd" "$group" "$user"
+        write_user_unit_file $systemd_service "$cmd" "$group" "$user" "$env_vars"
     fi
 
     $SYSTEMCTL enable $systemd_service
@@ -1676,18 +1688,20 @@ function is_running {
 # If the command includes shell metachatacters (;<>*) it must be run using a shell
 # If an optional group is provided sg will be used to run the
 # command as that group.
-# run_process service "command-line" [group] [user]
+# run_process service "command-line" [group] [user] [env_vars]
+# env_vars must be a space separated list of variable assigments, ie: "A=1 B=2"
 function run_process {
     local service=$1
     local command="$2"
     local group=$3
     local user=$4
+    local env_vars="$5"
 
     local name=$service
 
     time_start "run_process"
     if is_service_enabled $service; then
-        _run_under_systemd "$name" "$command" "$group" "$user"
+        _run_under_systemd "$name" "$command" "$group" "$user" "$env_vars"
     fi
     time_stop "run_process"
 }
diff --git a/lib/cinder b/lib/cinder
index 52818a81eb..ca2c084aff 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -552,8 +552,13 @@ function start_cinder {
     fi
 
     run_process c-sch "$CINDER_BIN_DIR/cinder-scheduler --config-file $CINDER_CONF"
-    run_process c-bak "$CINDER_BIN_DIR/cinder-backup --config-file $CINDER_CONF"
-    run_process c-vol "$CINDER_BIN_DIR/cinder-volume --config-file $CINDER_CONF"
+    # Tune glibc for Python Services using single malloc arena for all threads
+    # and disabling dynamic thresholds to reduce memory usage when using native
+    # threads directly or via eventlet.tpool
+    # https://www.gnu.org/software/libc/manual/html_node/Memory-Allocation-Tunables.html
+    malloc_tuning="MALLOC_ARENA_MAX=1 MALLOC_MMAP_THRESHOLD_=131072 MALLOC_TRIM_THRESHOLD_=262144"
+    run_process c-bak "$CINDER_BIN_DIR/cinder-backup --config-file $CINDER_CONF" "" "" "$malloc_tuning"
+    run_process c-vol "$CINDER_BIN_DIR/cinder-volume --config-file $CINDER_CONF" "" "" "$malloc_tuning"
 
     # NOTE(jdg): For cinder, startup order matters.  To ensure that repor_capabilities is received
     # by the scheduler start the cinder-volume service last (or restart it) after the scheduler