Usage:

dmstats
	[-h|--help]
	[-v|--verbose [-v|--verbose ...]]
	[--areas <nr_areas>] [--areasize <size>]
	[--userdata <data>] [--clear]
	[--count <count>] [--interval <seconds>]
	[-o <fields>] [-O|--sort <sort_fields>]
	     [--programid <id>]
	[--start <start>] [--length <length>]
	[--segments] [--units <units>]

	help
	clear [--allregions|--regionid id] [--alldevices|<device>...]
	create [--start <start> [--length <len>]
	    [--areas <nr_areas>] [--areasize <size>]
	    [--programid <id>] [--userdata <data> ]
	    [--bounds histogram_boundaries] [--precise]
	    [--segments] [--alldevices|<device>...]
	create --filemap [--nogroup] [--nomonitor] [--follow mode]
	    [--programid <id>] [--userdata <data> ]
	    [--bounds histogram_boundaries] [--precise] <file_path>
	delete [--allprograms|--programid id]
	    [--allregions|--regionid id]
	    [--alldevices|<device>...]
	group [--alias NAME] --regions <regions>
	    [--allprograms|--programid id] [--alldevices|<device>...]
	list [--allprograms|--programid id] [--allregions|--regionid id]
	print [--clear] [--allprograms|--programid id]
	    [--allregions|--regionid id]
	    [--alldevices|<device>...]
	report [--interval <seconds>] [--count <cnt>]
	    [--units <u>] [--programid <id>] [--regionid <id>]
	    [-o <fields>] [-O|--sort <sort_fields>]
	    [-S|--select <selection>] [--nameprefixes]
	    [--noheadings] [--separator <separator>]
	    [--allprograms|--programid id] [<device>...]
	ungroup --groupid <id> [--allprograms|--programid id]
	    [--alldevices|<device>...]
	update_filemap --groupid <id>
	    [--nomonitor] [--follow mode] <file_path>
	version

<device> may be device name or (if only one) -u <uuid> or -j <major> -m <minor>
<fields> are comma-separated.  Use 'help -c' for list.