On Friday, March 25, 2022, at 9 PM, “The Performance” Knowledge Planet held its first online “Tea Talk.” We were joined by 3 planet hosts, 5 guest experts, and over 50 members. Thank you all for coming!

We had no set topic and expected to finish in an hour. We ended up talking for two and a half hours; introductions alone took an hour! We had talked plenty in the group and on Knowledge Planet, but this was our first voice chat together. People worked across the Android ecosystem, from app companies and phone manufacturers to chip companies and EV startups. Someone would mention their work, someone else would ask a question, and off we went.

At the time, we planned to hold more sessions with clearer themes and more guests, on topics beyond technology too. We did not record this session to protect participants’ privacy. The notes below reconstruct part of the conversation without including private details.

This is the third article in the “Systrace Thread CPU State Analysis Tips” series. It focuses on the Sleep and Uninterruptible Sleep states in Systrace—their causes, troubleshooting, and optimization. These states often represent normal waiting; investigate their conditions and dependencies when they delay a critical path.

The goal of this series is to use Systrace to view the Android system from a different perspective and to learn the Framework through visualization. While reading Framework source code can be difficult to remember, seeing the flow in Systrace can lead to deeper understanding. You can find the complete Systrace Basics and Action Series here.

This is the second article in the “Systrace Thread CPU State Analysis Tips” series. It analyzes the causes of the “Running” state in Systrace and provides optimization strategies for when Running segments are excessively long.

The goal of this series is to use Systrace to view the Android system from a different perspective and to learn the Framework through visualization. While reading Framework source code can be difficult to remember, seeing the flow in Systrace can lead to deeper understanding. You can find the complete Systrace Basics and Action Series here.