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1What: /sys/bus/event_source/devices/<dev>/format2Date: January 20123KernelVersion: 3.34Contact: Jiri Olsa <jolsa@redhat.com>5Description:6 Attribute group to describe the magic bits that go into7 perf_event_attr::config[012] for a particular pmu.8 Each attribute of this group defines the 'hardware' bitmask9 we want to export, so that userspace can deal with sane10 name/value pairs.11 12 Userspace must be prepared for the possibility that attributes13 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 of21 perf_event_attr::config1.22