1Where: /sys/bus/event_source/devices/<dev>/format 2Date: January 2012 3Kernel Version: 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 attr1 = 'config:0-23' 15 attr2 = 'config:0-7' 16 attr3 = 'config:12-35' 17 18 Example: 'config1:1,6-10,44' 19 Defines contents of attribute that occupies bits 1,6-10,44 of 20 perf_event_attr::config1. 21