| Jiri Olsa | 641cc93 | 2012-03-15 20:09:14 +0100 | [diff] [blame] | 1 | Where: /sys/bus/event_source/devices/<dev>/format |
| 2 | Date: January 2012 |
| 3 | Kernel Version: 3.3 |
| 4 | Contact: Jiri Olsa <jolsa@redhat.com> |
| 5 | Description: |
| 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 | |
| Michael Ellerman | fd85178 | 2013-05-10 17:33:00 +0200 | [diff] [blame] | 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 | |
| Jiri Olsa | 641cc93 | 2012-03-15 20:09:14 +0100 | [diff] [blame] | 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. |