| commit | 7762ef107963a82c6af0a3e0139411c3d9f0f75e | [log] [tgz] |
|---|---|---|
| author | Primiano Tucci <primiano@google.com> | Thu Oct 08 22:04:49 2020 +0200 |
| committer | Primiano Tucci <primiano@google.com> | Thu Oct 08 22:04:49 2020 +0200 |
| tree | abf299d3f9157a8f430c38c443e7e6c2c700e4f0 | |
| parent | 02a7aa75bb248633459f159d0769edfa5d18a57e [diff] |
Add support for symbolizing kernel symbols for ftrace events
Makes use of the kallsyms parser perviously introduced
by aosp/1196774. The parser is enabled only when setting
symbolize_ksyms=true in the FtraceConfig proto.
For now the CL works only when perfetto is run as root
on dev phones. Will follow up with security team to
figure out a way forward.
This CL uses the FtraceMetadata to keep track of the
incremental symbols discovered. FtraceMetadata is
shared across all cpus, but is per-session. As a
summary this is the whole callstack of a ftrace read
cycle:
FtraceController::ReadTick()
for cpu = 0 .. num_cpus
CpuReader[i].ReadCycle(data_sources)
for (batch = 0; ...; batch++)
ReadAndProcessBatch(data_sources)
for (ds : data_sources)
ProcessPagesForDataSource(ds)
writes metadata
OnFtraceDataWrittenIntoDataSourceBuffers()
for (ds : data_souces)
// Forward metadata to other data souces.
metadata->Clear()
Design doc: go/perfetto-kallsyms
Bug: 147809529
Test: still TODO (but tested manually)
Change-Id: I59be90da96513c9e99981f73035dd7ee3a822d49Perfetto is a production-grade open-source stack for performance instrumentation and trace analysis. It offers services and libraries and for recording system-level and app-level traces, native + java heap profiling, a library for analyzing traces using SQL and a web-based UI to visualize and explore multi-GB traces.
See https://perfetto.dev/docs or the /docs/ directory for documentation.