Joy of Think

Command

setprop dalvik.vm.checkjni true
setprop libc.debug.malloc 10   
setprop setprop dalvik.vm.jniopts forcecopy
start
stop

In your DDMS configuration file (e.g. ~/.android/ddms.cfg on Linux), add "native=true".

libc.debug.malloc

bionic/libc/bionic/mallocdebugcommon.c

/* Handle to shared library where actual memory allocation is implemented.
    263  * This library is loaded and memory allocation calls are redirected there
    264  * when libc.debug.malloc environment variable contains value other than
    265  * zero:
    266  * 1  - For memory leak detections.
    267  * 5  - For filling allocated / freed memory with patterns defined by
    268  *      CHK_SENTINEL_VALUE, and CHK_FILL_FREE macros.
    269  * 10 - For adding pre-, and post- allocation stubs in order to detect
    270  *      buffer overruns.
    271  * Note that emulator's memory allocation instrumentation is not controlled by
    272  * libc.debug.malloc value, but rather by emulator, started with -memcheck
    273  * option. Note also, that if emulator has started with -memcheck option,
    274  * emulator's instrumented memory allocation will take over value saved in
    275  * libc.debug.malloc. In other words, if emulator has started with -memcheck
    276  * option, libc.debug.malloc value is ignored.
    277  * Actual functionality for debug levels 1-10 is implemented in
    278  * libc_malloc_debug_leak.so, while functionality for emultor's instrumented
    279  * allocations is implemented in libc_malloc_debug_qemu.so and can be run inside
    280   * the emulator only.
    281  */