| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | What: /sys/bus/event_source/devices/<dev>/format |
| 2 | Date: January 2012 |
| 3 | KernelVersion: 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 | |
| 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. |