Gather information about the system memory

def _memdata(osdata):
    '''
    Gather information about the system memory
    '''
    # Provides:
    #   mem_total
    #   swap_total, for supported systems.
    grains = {'mem_total': 0}
    if osdata['kernel'] == 'Linux':
        grains.update(_linux_memdata())
    elif osdata['kernel'] in ('FreeBSD', 'OpenBSD', 'NetBSD'):
        grains.update(_bsd_memdata(osdata))
    elif osdata['kernel'] == 'Darwin':
        grains.update(_osx_memdata())
    elif osdata['kernel'] == 'SunOS':
        grains.update(_sunos_memdata())
    elif osdata['kernel'] == 'AIX':
        grains.update(_aix_memdata())
    elif osdata['kernel'] == 'Windows' and HAS_WMI:
        grains.update(_windows_memdata())
    return grains