/RING_BUFFER [={ALL | address}]

    Displays the contents of the process-pool history ring buffer.
    Entries are displayed in reverse chronological order (most
    recent to least recent). If you specify /RING_BUFFER without
    the ALL keyword or an address, SDA displays all unmatched current
    allocations and deallocations. Use /RING_BUFFER=ALL to display
    matched allocations and deallocations and any non-current entries
    not yet overwritten. Use /RING_BUFFER=address to limit the
    display to only allocations and deallocations of blocks that
    contain the given address (including matched allocations and
    deallocations).