Android graphic system (SurfaceFlinger) : Design Pattern's perspectiveBin Chen
SurfaceFlinger is a vital system service in Android system, responsible for the composting all the application and system layer and displaying them. In this slide,we looked in detail how surfaceFlinger was designed from Design Pattern's perspective.
binder-for-linux is an experimental project to evaluate the feasibility of porting Android Binder IPC subsystem to Ubuntu Linux.
GitHub: https://github.com/hungys/binder-for-linux
Android graphic system (SurfaceFlinger) : Design Pattern's perspectiveBin Chen
SurfaceFlinger is a vital system service in Android system, responsible for the composting all the application and system layer and displaying them. In this slide,we looked in detail how surfaceFlinger was designed from Design Pattern's perspective.
binder-for-linux is an experimental project to evaluate the feasibility of porting Android Binder IPC subsystem to Ubuntu Linux.
GitHub: https://github.com/hungys/binder-for-linux
Linux 4.x Tracing: Performance Analysis with bcc/BPFBrendan Gregg
Talk about bcc/eBPF for SCALE15x (2017) by Brendan Gregg. "BPF (Berkeley Packet Filter) has been enhanced in the Linux 4.x series and now powers a large collection of performance analysis and observability tools ready for you to use, included in the bcc (BPF Complier Collection) open source project. BPF nowadays can do system tracing, software defined networks, and kernel fast path: much more than just filtering packets! This talk will focus on the bcc/BPF tools for performance analysis, which make use of other built in Linux capabilities: dynamic tracing (kprobes and uprobes) and static tracing (tracepoints and USDT). There are now bcc tools for measuring latency distributions for file system I/O and run queue latency, printing details of storage device I/O and TCP retransmits, investigating blocked stack traces and memory leaks, and a whole lot more. These lead to performance wins large and small, especially when instrumenting areas that previously had zero visibility. Tracing superpowers have finally arrived, built in to Linux."
Linux 4.x Tracing: Performance Analysis with bcc/BPFBrendan Gregg
Talk about bcc/eBPF for SCALE15x (2017) by Brendan Gregg. "BPF (Berkeley Packet Filter) has been enhanced in the Linux 4.x series and now powers a large collection of performance analysis and observability tools ready for you to use, included in the bcc (BPF Complier Collection) open source project. BPF nowadays can do system tracing, software defined networks, and kernel fast path: much more than just filtering packets! This talk will focus on the bcc/BPF tools for performance analysis, which make use of other built in Linux capabilities: dynamic tracing (kprobes and uprobes) and static tracing (tracepoints and USDT). There are now bcc tools for measuring latency distributions for file system I/O and run queue latency, printing details of storage device I/O and TCP retransmits, investigating blocked stack traces and memory leaks, and a whole lot more. These lead to performance wins large and small, especially when instrumenting areas that previously had zero visibility. Tracing superpowers have finally arrived, built in to Linux."
13. Androidでの解決 Binder
• プロセス間通信をドライバで実装
• 共用メモリを利用した高速処理
• 処理要求のためのプロセス毎にスレッドプールを用意
• 参照カウントとプロセスと超えてオブジェクトの参照
• プロセス間の同期呼び出し
“In the Android platform, the binder is used for
nearly everything that happens across processes
in the core platform. " – Dianne Hackborn
https://lkml.org/lkml/2009/6/25/3
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59. SMからBinder Driver
Client Service Manager
service list
1 登録 Server
IXXX
Name:Handle onTransact(…)
2 Name:Handle thread pool
Handle=0 Name:Handle
transact(…)
問い合わせ
3 4 5 User Space
Kernel Spac
Binder Driver: /dev/binder
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74. 実際の例
Binder IPC is used for communicating between Graphics client and server.
Taken from http://www.cnblogs.com/xl19862005/archive/2011/11/17/2215363.html 74
75. Surface
Source: frameworks/base/core/java/android/view/Surface.java
/* Handle on to a raw buffer that is being managed by the
screen compositor */
public class Surface implements Parcelable {
public Surface() {
mCanvas = new CompatibleCanvas();
}
private class CompatibleCanvas
extends Canvas { /* ... */ }
}
Surface のinstancesはParcelとして読み書きできる
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