Lua memory (de)allocation tracer: (#5191)

* Lua memory (de)allocation tracer:

Usage:
 * turn on: `cmake -DLUA=YES -DLUA_ALLOCATOR_TRACER=YES -DDEBUG=YES -DNANO=NO`
 * get debug output and make plot data: `./simu 2>&1 | grep "^LT" | ../radio/util/lua_trace2plot.py > data.plot`
 * plot: `gnuplot  -e 'set xtics rotate;  plot "data.plot" using 2:xtic(1) ; pause mouse close'`

* Changes based on Bertrand comments

radio/util/lua_trace2plot.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+    This script parses debug log events related to Lua memory (de)allocations ( lines
+    starting wiht "LT: ") and produces a data for gnuplot program
+
+    Usage:
+
+        ./simu 2>&1 | grep "^LT" | ../radio/util/lua_trace2plot.py > data.plot
+        gnuplot  -e 'set xtics rotate;  plot "data.plot" using 2:xtic(1) ; pause mouse close'
+"""
+
+from __future__ import print_function
+
+import sys
+
+
+if len(sys.argv) > 1:
+    inputFile = sys.argv[1]
+    inp = open(inputFile, "r")
+else:
+    inp = sys.stdin
+
+
+x = 0
+memUsed = 0
+while True:
+    skip = True
+    line = inp.readline()
+    if len(line) == 0:
+        break
+    line = line.strip('\r\n')
+    if len(line) == 0:
+        skip = True
+    if line.startswith("LT:"):
+        skip = False
+
+    if not skip:
+        parts = line.split()
+        if len(parts) >= 3:
+            data = parts[1].strip("[").strip("]").split(",")
+            alloc = int(data[0])
+            free = int(data[1])
+            line = parts[2]
+            if alloc > 0:
+                memUsed += alloc
+                print("'%s'\t%d" % (line, memUsed))
+                x += 1
+            if free < 0:
+                memUsed += free
+                print("'%s'\t%d" % (line, memUsed))
+                x += 1
+
+inp.close()