MAT is a memory analysis tool that monitors calls to malloc, realloc and free calls. It works with a small shared library libmat.so that is loaded into the program with the LD_PRELOAD dynamic linker feature (See the ld.so(8) man page). The library overrides the malloc, realloc and free function to monitor calls to these functions. It then writes or sends probe events which contain enough information for mat to tell what, when, where and by whom the memory allocation was done.