commit f2855b2aaec65415f3d5366b43fc1d4b38e67042
author Lakshman Annadorai <lakshmana@google.com> Tue Mar 03 14:13:10 2020 -0800
committer Lakshman Annadorai <lakshmana@google.com> Thu Mar 05 16:23:14 2020 -0800
tree 8867e3bfbccb54baab306e8f42b339fee5c63fd7
parent 325e9652ab02a1c39e1b4039d038ffe7807f0724

Implement collection events and handler looper for the collection thread.

- I/O performance data collection runs on a new collection thread and
the collection events are handled by the looper handler.
- CarWatchdog daemon can interact with the I/O performance collection
module via the public methods to start collection, switch collection
type, dump collection records, and terminate collection.
- Following CL will integrate I/O performance collection module with the
CarWatchdog daemon's ServiceManager.
- Added Looper wrapper and stub so the tests can deterministically interact
with the looper and execute the collection on the collection thread.
- Added stubs for UidIoStats, ProcStat, and ProcPidStat collectors so
tests can similate the response from these collectors.
- Added unit tests to similate different collection events.

Below reports were generated from IoPerfCollectionTest#TestValidCollectionSequence test:
Sample bugreport dump:
https://paste.googleplex.com/5761927382827008

Sample custom collection dump:
https://paste.googleplex.com/4592660822097920

Bug: 148486340, 130382110
Test: Tested with unit tests.
Change-Id: I517badad732b6d199082c0d126bb5fa22f36ec89