Add overhead info to memory trace tutorial

Deepika · Deepika · commit bb3f709c14c3 · 2018-08-30T12:08:30.000-05:00
diff --git a/docs/tutorials/optimize/memory/runtime_mem_trace.md b/docs/tutorials/optimize/memory/runtime_mem_trace.md
@@ -62,3 +62,4 @@ It outputs the following trace:
 
 - The tracer doesn't handle nested calls of the memory functions. For example, if you call `realloc` and the implementation of `realloc` calls `malloc` internally, the call to `malloc` is not traced.
 - The **caller** argument of the callback function isn't always reliable. It doesn't work at all on some toolchains, and it might output erroneous data on others.
+- Overhead of 8 bytes is added to every dynamic memory allocation when memory tracing is enabled.

Original file line number	Diff line number	Diff line change
`@@ -62,3 +62,4 @@ It outputs the following trace:`
`62`	`62`
`63`	`63`	- The tracer doesn't handle nested calls of the memory functions. For example, if you call `realloc` and the implementation of `realloc` calls `malloc` internally, the call to `malloc` is not traced.
`64`	`64`	`- The caller argument of the callback function isn't always reliable. It doesn't work at all on some toolchains, and it might output erroneous data on others.`
	`65`	`+- Overhead of 8 bytes is added to every dynamic memory allocation when memory tracing is enabled.`