| commit | fe05b818b24e52417ed2f36d9bbe56914a772bb0 | [log] [tgz] |
|---|---|---|
| author | Chinglin Yu <chinglinyu@google.com> | Thu Nov 14 16:58:50 2024 +0800 |
| committer | Chinglin Yu <chinglinyu@google.com> | Thu Nov 14 16:58:50 2024 +0800 |
| tree | 553b3febc1b3c85ac0b2076c4e8cdf9d4b07536d | |
| parent | 819d1a768426dfa7830a0a38fa56dc5972e7cd14 [diff] |
tp: fix kernel idle tasks for boot-time traces
In boot-time traces, CPU scheduling tracks contain "swapper/0" tasks,
which should be hidden on the UI. These idle tasks show up because
kernel startup traces contain the following events:
event {
timestamp: 17000000
pid: 1
task_newtask {
pid: 0
comm: "swapper/0"
clone_flags: 256
oom_score_adj: 0
}
}
that /sbin/init creates more swapper/0 kernel idle tasks with pid/tid ==
0. Filter these task_newtask events since they do not create real new
threads.
Bug: 379009092
Change-Id: I556e085e35ca622fcfee7a3b5122f853eead05eaPerfetto 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.