1What:		/sys/bus/event_source/devices/<dev>/format
 2Date:		January 2012
 3KernelVersion: 3.3
 4Contact:	Jiri Olsa <jolsa@redhat.com>
 5Description:
 6		Attribute group to describe the magic bits that go into
 7		perf_event_attr::config[012] for a particular pmu.
 8		Each attribute of this group defines the 'hardware' bitmask
 9		we want to export, so that userspace can deal with sane
10		name/value pairs.
11
12		Userspace must be prepared for the possibility that attributes
13		define overlapping bit ranges. For example::
14
15			attr1 = 'config:0-23'
16			attr2 = 'config:0-7'
17			attr3 = 'config:12-35'
18
19		Example: 'config1:1,6-10,44'
20		Defines contents of attribute that occupies bits 1,6-10,44 of
21		perf_event_attr::config1.