Test big.LITTLE on Android 12.05

Registered by Amit Pundir on 2012-04-27

This is a continuation of https://blueprints.launchpad.net/linaro-android/+spec/test-biglittle-1204

Linaro is taking the lead to bring big.LITTLE to Linux. From http://www.arm.com/products/processors/technologies/bigLITTLEprocessing.php, "big.LITTLE processing addresses one of today’s industry challenges: how to create a System on Chip (SoC) that provides both high performance as well as extreme power efficiency to extend battery life. "

The TSC card is here:

https://linaro.papyrs.com/KWG2012-big-LITTLE-Task-Migration

<email address hidden> is doing the initial implementation.
<email address hidden> is bringing up the A15 model in the LAVA lab.
<email address hidden> and <email address hidden> (tixy) may be able to help us get a simulator up and running locally and work to get Android running on it.

I imagine that we'll want to get Android running on the A15 with the big.LITTLE work from Grant running. Then runs some tests from Grant to validate that its working. We can use TINY_ANDROID to do the work.

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Step 1:

Write a small C program, callable from the command line that takes the following arguments

--cpu - optional to specify which CPU
--state - big, little
--frequency - a number in Hz to switch between big and little

Step 2:

Write and submit to AOSP an Android HAL that can control big little switching. Write a test that can test the HAL.

Step 3:

Write a userspace Android program allows a user to switch between big and little and specify a rate of switching. Should also provide a view into powersavings, perhaps using the same mechanism as powertutor.

From Mounir the PM:

Hangouts:
https://plus.google.com/hangouts/extras/linaro.org/118212388148355955219-7618679083?authuser=0&hl=en&eid=#

Current test Plan
https://docs.google.com/a/linaro.org/document/d/14Kta4wQ0QdKlO_iQ41EolkLm-pxw_Ggh_OW-ca6BEvM/edit

Platforms bringup - asac changes to the plan
http://pad.linaro.org/5T9dICYtbK

Blueprint
https://blueprints.launchpad.net/linux-linaro/+spec/linaro-kernel-q112-big-little-switcher

Timeline (proposed)
https://wiki.linaro.org/Internal/People/MounirBsaibes/Big.LittleWeeklyReportTemplate

__Major Milestones__

Milestones:
ARM reference Switcher 3/15/2012
Validation Ready 3/29/2012
Validate Reference Switcher 4/5/2012
Linux Integrated Switcher 4/5/2012
Validate Integrated Switcher 4/26/2012
Release Candidate 1 (RC1) 5/10/2012
General Availability (GA) 5/31/2012

__Execution Matrix__

https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdGttYkhCUGVzZ2JOS0tGaU1QUm9wOHc#gid=0

Blueprint information

Status:
Complete
Approver:
Zach Pfeffer
Priority:
High
Drafter:
Amit Pundir
Direction:
Approved
Assignee:
Amit Pundir
Definition:
Approved
Series goal:
Accepted for 2012q1
Implementation:
Implemented
Milestone target:
milestone icon 12.05
Started by
Zach Pfeffer on 2012-05-01
Completed by
Zach Pfeffer on 2012-05-29

Related branches

Sprints

Whiteboard

Notes:
[2012/4/27 pundiramit] Notes here.
[2012/5/08 pundiramit] Few C level unit tests are already covered and rest implemented using shell scripts.
[2012/5/14 pundiramit] RC1 available for testing on 5/11

Meta:
Roadmap id: ANDROID2012-BIG-LITTLE
Headline: ARM's big.LITTLE has been tested
Acceptance: Test big.LITTLE on the A15/A7 simulator running Android using a set of unit tests.

(?)

Work Items

Work items:
Write small C program with command line arguments: DONE
Integrate small C program into build: DONE
Build C level unit tests: DONE
Integrate C level unit tests into build: DONE
Modify test scripts to enable thread switching: DONE
Modify test scripts to enable random switching: DONE
Validate RC1 (5/10/2012): DONE
Pre RC-2 testing: DONE
RC-2 testing(5/24/2012): DONE
Enable interactive governor : DONE
Test interactive governor with cpufreq: DONE
Create script for binary overlay to install tests into reference switcher builds: DONE

Dependency tree

* Blueprints in grey have been implemented.

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