tree 4e6e7e1c94a699ac8c2c7aaac524a6b2d37a9824
parent 40ab0ab3ab621af63c6301312462bab7a974d75a
author Samuel Wu <wusamuel@google.com> 1776712517 -0700
committer Samuel Wu <wusamuel@google.com> 1777423056 -0700

traced: Support named PMU events in linux.perf

This change allows users to specify hardware events by their name (e.g.,
'l3d_cache') instead of raw config IDs. The profiler resolves these
names at runtime by reading from sysfs. To ensure safety, it also reads
the PMU's format/event file to verify the event variable maps directly
to the lowest bits of the config field.

Example Perfetto config:

Old:
raw_event {
  pmu_name: "arm_dsu_0"
  config: 43
}

New:
raw_event {
  pmu_name: "arm_dsu_0"
  event_name: "l3d_cache"
}

Bug: 501821381
Test: manual test
Signed-off-by: Samuel Wu <wusamuel@google.com>