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