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Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-event_source-devices-caps')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-event_source-devices-caps | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-caps b/Documentation/ABI/testing/sysfs-bus-event_source-devices-caps new file mode 100644 index 000000000000..a5f506f7d481 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-caps @@ -0,0 +1,24 @@ +What: /sys/bus/event_source/devices/<dev>/caps +Date: May 2022 +KernelVersion: 5.19 +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> +Description: + Attribute group to describe the capabilities exposed + for a particular pmu. Each attribute of this group can + expose information specific to a PMU, say pmu_name, so that + userspace can understand some of the feature which the + platform specific PMU supports. + + One of the example available capability in supported platform + like Intel is pmu_name, which exposes underlying CPU name known + to the PMU driver. + + Example output in powerpc: + grep . /sys/bus/event_source/devices/cpu/caps/* + /sys/bus/event_source/devices/cpu/caps/pmu_name:POWER9 + + The "branch_counter_nr" in the supported platform exposes the + maximum number of counters which can be shown in the u64 counters + of PERF_SAMPLE_BRANCH_COUNTERS, while the "branch_counter_width" + exposes the width of each counter. Both of them can be used by + the perf tool to parse the logged counters in each branch. |