Accelerated Android Development with Linaro

Accelerated Development with Linaro
Infrastructure, Validation, and Optimization

Jim Huang ( 黃敬群 )
Developer, Linaro : <jim.huang@linaro.org>
Developer, 0xlab : <jserv@0xlab.org>
May 18, 2011

Agenda

 Infrastructure
Linaro – Accelerating Product Development
 Working Groups
 Evaluation Builds
 Validation
 Optimization

Open Source Revolution

 Billions of consumer devices rely on open source software
 Google Android, Apple iOS, RIM, Windows Mobile, ...
 OEMs and ODMs want chip vendors to offer the best open
source support for their SoCs and to avoid low level
fragmentation speeding their time to market
 Example: Qualcomm/QuIC
 This necessitates working together – kernel consolidation,
aligned investment, defragmentation, aligned
upstreaming, open source leadership

About Linaro
“to make it easier and quicker for ARM partners to
“to make it easier and quicker for ARM partners to
deploy the latest technology into optimized Linux
deploy the latest technology into optimized Linux
based products”
based products”

 Founded in June 2010
 Members align their open source strategy with Linaro
 Provides shared Leadership in open source

What does Linaro do?
 Delivers a optimized code base
– Kernel and vital middleware
– Applied across all member SoCs
 Tools
– Best compiler, debugger, profiler
 Enabled on the latest SoCs
– Cortex A8, A9, & A15 processors
 Delivered upstream
– Evaluation builds for key
distributions – Android, Chrome,
Ubuntu, Other Linux
– Test & Validation framework
for member SoCs
OEM
Linu
x
Linaro – NOT a distribution

 Infrastructure
Linaro – Accelerating Product Development
 Working Groups
 Evaluation Builds
 Validation
 Optimization

Where does Linaro fit?
Community (upstream)
Aligned upstream
investment

Distribution
s take from
Linaro upstream
Common
Linux Core
Software
Evaluation
Builds

OEM
Linux
Downstream

Engineering units
Optimization & Innovation SoC support and
SoC support and
Optimization & Innovation
optimization
optimization

Working Groups Platform
Engineering
Kernel Consolidation
Validation &
Benchmarking
Toolchain
Toolchain
Evaluation Builds
Android, Ubuntu,
Graphics
Graphics Chrome, IVI…

Power Management
Power Management Infrastructure
Release management
:
Multimedia
Multimedia

Validation, benchmarking,
Validation, benchmarking,
release management
release management

Working with Linaro
 Linaro kernel becomes members most advanced
 Vendor BSP and Linaro landing team engineers work
together
 Get latest software on latest SoCs with upstream support

WGs: Alignment, Optimization,
Leadership
 Aligned investment: boot,
power mgmt, Float, kernel… Working Groups
 Open source Leadership Kernel Consolidation

 Latest software on latest HW Toolchain
Toolchain
Graphics
Graphics

Power Management
Power Management
:
Multimedia
Multimedia

Linaro eval builds & test farms
OEM
Linux

 Linaro evaluation builds push
latest software into distributions Platform
Engineering
g
Validation &
 Validation test farms monitor Benchmarking
improvements in software quality Evaluation
Builds
Android, Ubuntu

 Benchmarking ensures continuous Infrastructur
e
improvements in performance Release
management

Validation & Eval builds
Validation & Eval builds

Linaro Evaluation Android Build
 Reduced TTM with streamlined integration
 Increased optimisation and benchmarking
 Validation on multiple hardware

Ubuntu
Ubuntu
Android
Android

Linaro kernel
Linaro kernel HW
HW
(Common)
(Common) Pack
Pack

Early Android for latest member Test & Validation farm
hardware with Linaro optimisations Benchmarking

Evaluation Builds

 Builds of key distributions incorporating
Linaro’s technology

 Initial Evaluation builds (11.05)
– Android 2.3 Gingerbread
– Ubuntu 11.04

Benefits of Evaluation Builds

 Demonstrate the output of the working groups
 Real-life product-quality distributions for Linaro
performance and regression testing
 Closer to understanding and delivering tangible
deliverables that shorten the TTM
 Serve as basis for OEM/ODM commercialization
 Validate members silicon and reference designs
 Attract distribution owners to Linaro
 Attract a wider community audience

11.05: Working Group Deliverables

 Toolchain
 Produce the best all-round v7 GCC compiler
 EEMBC DENBench/ConsumerBench, SPEC CPU2006
 linaro-gcc 4.5 & 4.6, linaro-gdb 7.2, cortexstrings 1.0
 ARM-enhance/port qemu, libunwind, ltrace, gold, libgc
 Kernel
 Linaro Linux and Linaro Android trees
 Devicetree evaluation kernels
 GPU and MM implementation guidelines
 Power Management
 Standard ARM-enhanced management mechanisms
 Hotplug, thermal and clock/regulator tree common interfaces
 Allow custom engines to encode policies
 Tools to demonstrate interfaces and debug behaviors

11.05: Working Group Deliverables

 Multimedia
 A multimedia optimization workbench
 ARM-enhanced JPEG and VP8 decoding
 OpenMAX-standardized components
 Free content for benchmarks and testing

 Graphics
 OpenGL ES backends for Cairo, Skia, meegotouch-
compositor, chromium-wm and compiz
 Work with vendors and upstream to document a common
ARM-standard acceleration framework

Quality & Performance
 Open source code has limited testing as it is
created
 Linaro needs to quantitatively measure its
performance & quality over time
– Benchmarks
– Power consumption under system loads
– System stability
 Linaro engineering needs improved tools
– Smoke testing
– Regression testing
– Automated testing with real distributions

Linaro Test & Validation
 We have started to develop our test & validation
farm to benefit members & our own engineering
 Populated by member hardware
 Goals
– Linaro 11.05
• Running automated daily builds and smoke tests
• Running daily benchmarks
• At least 2 member boards
– Linaro 11.11 and beyond
• Automated performance tests on release and daily builds
• Automated stability tests
• Hardware from all members
• Web dashboard available

Automated Validation for Android

Android benchmark running on LAVA. Android support on LAVA
Automated Validation flow includes https://wiki.linaro.org/Platform/Validation/LAVA
from deploy, then reboot, testing,
Android related commands in LAVA:
benchmark running, and result submit. * deploy_linaro_android_image
* boot_linaro_android_image
* test_android_basic
* test_android_monkey
* test_android_0xbench
* submit_results_on_host

https://code.launchpad.net/~linaro-validation/lava/trunk
Reference hardware:
Beagleboard xM https://wiki.linaro.org/JeremyChang/Sandbox/LavaAndroidValidation
Pandaboard Android-dev branch:
lp:~jeremychang/lava/android-support

0xbench: comprehensive open source
benchmark suite for Android
• A set of system utilities for
Android to perform
comprehensive system
benchmarking
• Dalvik VM performance
• OpenGL|ES performance
• Android Graphics framework
performance
• I/O performance
• Connectivity performance
• Micro-benchmark: stanard C library,
system call, latency, Java
invocation, ...

Collect and Analyze
results in the cloud

Accelerated Android Development with Linaro

Android Platform Team

https://wiki.linaro.org/Platform/Android

Scope
 Provide Linaro optimized builds of the Android software
stack
 Help consolidate and improve the Android ecosphere
 Extend Android validation

Goals
 Reduce ODM/OEM time-to-market
 Upstream Linaro optimizations

11.05 Accomplishments
 25 patches sent upstream, 9 merged

– Merged Sample
 bionic: Add ARM optimized strcpy()
 libpng: use GCC visibility to reduce shared library size
 Allow building toolchain without target gdb alternatively.
 Accepted Sample
 libpixelflinger: Add ARM NEON optimized scanline_t32cb16
 Dramtically improve boot animation performance

https://review.source.android.com/#dashboard,1002471

Development Aspects
 ARM specific optimizations
 multi-core for bionic libc, dalvik, skia, blitter,
RenderScript, WebKit, etc.
 Figure out hotspot for further improvements
and and apply strong validation
 SoC vendor HAL/enhancement consolidation=
 code size, performance, debugging facility,
introducing latest technologies
 Recompiled by Linaro Toolchain for Android (2011.04), skia obtains
10% performance gain. Up to 150% for specialized routines

11.05 Accomplishments

Created daily Android builds

Released 11.04 Panda-LEB build
https://android-build.linaro.org/builds/~linaro-android/leb-panda/

How Linaro delivers value
 Linaro provides a common platform for member SoCs
and Linux distributions
 Enables SiP, Distribution, OEM, ODM to focus on value add
rather than common core code
 Multiplier effect of multiple member resources working
on common code base
 Access to test & validation framework
 Support and services
 Faster time to market for end products

Roadmap
 Work with distributions to become the enablement
channel for member SoCs
 Work with ARM to deliver open source support for
Cortex A15
 Continue to work on ARM generic SoC optimization
including toolchain support, NEON and SMP issues
 Support new market segments
 DTV/STB, Server

Benefits to everyone
 SoC Vendors
– Linaro makes Linux BSPs easier to create and support
– Ability to accelerate TTM for new products through
working inside Linaro before SoC release
 Distributions
– Linaro enables rapid support for multiple SoCs for new
distribution versions
 OEM/ODM
– Software and tool reuse between projects
– Faster TTM
 Carriers & Segment Leaders
– Linaro enables a standardized ARM Linux core for segment
specific distributions (mobile, STB, embedded etc.)

Summary

 Linaro is a not for profit software engineering
company owned by ARM, IBM and SoC vendors
 Delivers core Linux technology for ARM SoCs
 Faster product TTM through better integration of ARM
with upstream & distributions
 Members get significant advantages of belonging to
Linaro: Multiplier effect, latest software on latest SoCs,
defragmentation & happy customers

Accelerated Android Development with Linaro

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