Perfetto：抓取log与分析

编译工具，然后使用工具抓取Trace并及进行分析。

1 编译工具

下载Perfetto源码：

git clone https://android.googlesource.com/platform/system/perfetto.git
cd perfetto

生成配置文件：

tools/gn gen out/linux

编译traced等工具：

ninja -C out/linux

2 设置抓取数据

2.1 启动traced和traced_probe

启动traced：

traced &

如下：

[979.989]          service.cc:249 Started traced, listening on /tmp/perfetto-producer /tmp/perfetto-consumer

启动traced_probes：

traced_probes &

如下：

[987.162]           probes.cc:103 Starting ./traced_probes service
[987.163] ing_service_impl.cc:395 Producer 1 connected, uid=1000
[987.164]  probes_producer.cc:394 Connected to the service
...

2.2 启动websocket_bridge

启动websocket_bridge，指定端口8037：

websocket_bridge --port 8037

如下：

./websocket_bridge --port 8037
[004.882]  websocket_bridge.cc:90 [WSBridge] adb server socket is:127.0.0.1:5037.
[004.882]       http_server.cc:67 [HTTP] Starting HTTP server on 127.0.0.1:8037
[004.882]       http_server.cc:78 [HTTP] Starting HTTP server on [::1]:8037
[004.882] websocket_bridge.cc:101 [WSBridge] Listening on 127.0.0.1:8037
[095.739]      http_server.cc:120 [HTTP] New connection
[095.740]      http_server.cc:271 [HTTP] GET /traced [body=0B, origin="http://localhost:10000"]
[095.740] websocket_bridge.cc:119 [WSBridge] New connection from "http://localhost:10000"
[095.740] websocket_bridge.cc:130 [WSBridge] Connected to /tmp/perfetto-consumer
[095.740]      http_server.cc:358 [HTTP] Handshaking WebSocket for /traced
[095.740]      http_server.cc:360 > Upgrade: websocket
[095.740]      http_server.cc:360 > Connection: Upgrade
[095.740]      http_server.cc:360 > Sec-WebSocket-Accept: mhAzf3QnrRHbW9FI4dirqtDw3o0=
[095.757] ing_service_impl.cc:489 Consumer 0x6195fe7a1180 connected from UID 1000
[178.973]      http_server.cc:120 [HTTP] New connection
[178.973]      http_server.cc:271 [HTTP] GET /traced [body=0B, origin="http://localhost:10000"]
[178.973] websocket_bridge.cc:119 [WSBridge] New connection from "http://localhost:10000"
[178.973] websocket_bridge.cc:130 [WSBridge] Connected to /tmp/perfetto-consumer
[178.974]      http_server.cc:358 [HTTP] Handshaking WebSocket for /traced
[178.974]      http_server.cc:360 > Upgrade: websocket
[178.974]      http_server.cc:360 > Connection: Upgrade
[178.974]      http_server.cc:360 > Sec-WebSocket-Accept: WETKBNkabPJrB+Ajdv8sIYyKqSQ=
[178.987] ing_service_impl.cc:489 Consumer 0x6195fe7a3a90 connected from UID 1000
[178.987] ing_service_impl.cc:599 Enabling tracing for consumer 0x6195fe7a23a0, UUID: 103ffaee-5a0a-5bed-9eb0-a892896bc7a5
[178.988] ng_service_impl.cc:3275 Setting up data source linux.ftrace with target buffer 1
[178.988] ng_service_impl.cc:3309 Creating SMB of 2048 KB for producer "perfetto.traced_probes"
[178.988] ng_service_impl.cc:3275 Setting up data source linux.process_stats with target buffer 2
[178.988] ng_service_impl.cc:3275 Setting up data source linux.sys_stats with target buffer 1