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README
Apache-2.0

bytrace组件

简介

bytrace是开发人员用于追踪进程轨迹、查看性能的一种工具,主要对内核ftrace进行了封装和扩展,来支持用户态的打点。该工具主要分为两部分,API和命令行:

  1. bytrace向应用开发人员暴露了打点的API,开发应用过程中可以在关键代码处调用对应API进行打点;
  2. 命令行部分通过使能对应的label,来获取打点信息。通过该工具可以打开想要查看的用户态和内核label(通过命令行“bytrace -l”,查看支持的所有label),然后通过命令行进行抓取trace信息到指定文件中,下文有具体使用指导。

架构图

目录

/developtools/bytrace
├── bin           # bytrace组件代码目录 
│   └── include   # 头文件目录
│   └── src       # 源文件目录
│   └── test      # 测试用例目录
├── interfaces    # 对外接口存放目录
│   └── innerkits # 对内部子系统暴露的头文件存放目录
│   └── kits      # 对外部暴露的头文件存放目录
├── script        # 脚本目录

说明

使用说明

bytrace当前支持如下命令:

表 1 命令行列表

Option

Description

-h,--help

查看option帮助

-b n,--buffer_size n

指定n(KB)内存大小用于存取trace日志,默认2048KB

-t n,--time n

用来指定trace运行的时间(单位:s),取决于需要分析过程的时间

--trace_clock clock

trace输出的时钟类型,一般设备支持boot、global、mono、uptime、perf等,默认为boot

--trace_begin

启动抓trace

--trace_dump

将数据输出到指定位置(默认控制台)

--trace_finish

停止抓trace,并将数据输出到指定位置(默认控制台)

-l,--list_categories

输出手机能支持的trace模块

--overwrite

当缓冲区满的时候,将丢弃最新的信息。(默认丢弃最老的日志)

-o filename,--output filename

指定输出的目标文件名称

-z

抓取trace后进行压缩

以下是常用bytrace命令示例,供开发者参考:

  • 查询支持的label。

    bytrace -l

    或者

    bytrace --list_categories
  • 设置4M缓存,抓取10秒,抓取label为ability的trace信息。

    bytrace -b 4096 -t 10 --overwrite ability > /data/mytrace.ftrace
  • 设置trace的输出时钟为mono。

    bytrace --trace_clock mono  -b 4096 -t 10 --overwrite ability > /data/mytrace.ftrace
  • 抓取trace后进行压缩。

    bytrace -z  -b 4096 -t 10 --overwrite ability > /data/mytrace.ftrace

相关仓

研发工具链子系统

developtools_bytrace_standard

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简介

A tool to trace processes and monitor performance | 提供性能追踪的接口和查看性能轨迹的命令行工具 展开 收起
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