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+Where:          /sys/bus/event_source/devices/<dev>/format
+Date:           January 2012
+Kernel Version: 3.3
+Contact:        Jiri Olsa <jolsa@redhat.com>
+Description:
+                Attribute group to describe the magic bits that go into
+                perf_event_attr::config[012] for a particular pmu.
+                Each attribute of this group defines the 'hardware' bitmask
+                we want to export, so that userspace can deal with sane
+                name/value pairs.
+
+                Example: 'config1:1,6-10,44'
+                Defines contents of attribute that occupies bits 1,6-10,44 of
+                perf_event_attr::config1.