Mistake on this page?
Report an issue in GitHub or email us

Memory tracing

Mbed OS provides a set of functions that you can use to study the runtime memory allocation pattern of your software: which sections of the code allocate and free memory and how much memory they need.

You must enable the memory-tracing-enabled setting in the Mbed OS platform configuration options to enable memory tracing. We recommend doing this by adding it to your mbed_app.json:

    "target_overrides": {
        "*": {
            "platform.memory-tracing-enabled": true

You can use the mbed_mem_trace_set_callback API to set the callback for memory tracing. The callback is invoked every time you call standard allocation functions, such as malloc, realloc, calloc and free.

For a step-by-step guide about how to use optimize memory using runtime memory tracing, please see our runtime memory tracing tutorial.

Memory tracing functions reference

Memory tracing example

 * Copyright (c) 2020 Arm Limited and affiliates.
 * SPDX-License-Identifier: Apache-2.0

#include <stdlib.h>
#include "mbed.h"
#include "mbed_mem_trace.h"

int main()
    while (true) {
        void *p = malloc(50);
        printf("50B allocated at %p\n", p);


        printf("50B freed at %p\n\n", p);

Important Information for this Arm website

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. If you are not happy with the use of these cookies, please review our Cookie Policy to learn how they can be disabled. By disabling cookies, some features of the site will not work.