commit ed56789427e9ad971aaaa1bac6352a0f8319bc88
author Samuel Wu <wusamuel@google.com> Wed Apr 03 16:16:04 2024 -0700
committer Samuel Wu <wusamuel@google.com> Tue Apr 09 13:06:18 2024 -0700
tree 3888bc5664ebf9e86784e9d76a6e452e48eb74db
parent d73a73c828d3388823f4bcc0710aeee8053103f9

stdlib: Add system_state library for Wattson

Setup Wattson as a new library within Perfetto's standard library. This
patch moves the existing query used for Wattson, which calculates the
CPU subsystem system state, into Perfetto's standard library. Future
work will build upon the system state implemented in this patch and move
the entire energy estimation logic into the standard library.

The SQL files are organized by properties of the CPU subsystem,
such as CPU frequency, CPU idle state, and ARM DSU PMU counters, which
correspond to cpu_freq.sql, cpu_idle.sql, and arm_dsu.sql respectively.
Specific tables can be included and joined together later on as needed,
as is done in system_state.sql, which aggregates the frequency, idle
state, suspend, and DSU counters into the final CPU system state.

The patch has a test for each of Pixel phone and Pixel watch, testing
the end-to-end system states of two different devices, with specific
support for ARM DSU PMU and suspend/resume testing respectively.
Additionally, there are unit tests of the smaller building blocks, such
as individual cpu_idle, cpu_freq, and device name extraction tests.

Test: tools/diff_test_trace_processor.py out/linux/trace_processor_shell --name-filter '.*wattson.*'
Bug: 329507878
Change-Id: Ia3baed71056b3141901a7d1a28bbf3e237284c75
Signed-off-by: Samuel Wu <wusamuel@google.com>