typedef struct {
    /* The address of the last ALLOC_BTS_DEPTH (8) callers as referenced by stack frames */
    uint64_t callers[ALLOC_BTS_DEPTH];
    /* The smallest allocation size requested by this call path */
    size_t lower_bound_size;
    /* The largest allocation size requested by this call path */
    size_t upper_bound_size;
    /* A 16 bit hash of the back trace */
    uint16_t backtrace_hash;
} iso_alloc_traces_t;

typedef struct {
    /* The address of the last 8 callers as referenced by stack frames */
    uint64_t callers[BACKTRACE_DEPTH];
    /* A 16 bit hash of the back trace */
    uint16_t backtrace_hash;
    /* Call count */
    size_t call_count;
} iso_free_traces_t;