bazelbuild/bazel

place "Garbage Collector" profile track near system stats

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#29,310 opened on Apr 15, 2026

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P4help wantedteam-Remote-Exectype: feature request

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Description

The "Garbage Collector" profile track is sorted to the top of the perfetto UI by https://github.com/bazelbuild/bazel/blob/ee72e6ddbcf19db6e4ddf127bde56ca5676de780/src/main/java/com/google/devtools/build/lib/profiler/ThreadMetadata.java#L89. In paticular, it's often useful to examine the GC track in conjunction with the memory tracks. While it's possible to reorganize the tracks in the Perfetto UI, I propose to move the GC track down by the rest of the system stats by default.

Contributor guide

Research direction
Locate the ThreadMetadata.java file, find the line that sorts the GC track, and adjust the sorting order to place it near system stats. Test the change.
Tech stack
java
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitJava
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80