Perfetto工具用法

一、抓取trace

Perfetto配置

Perfetto在Android 9以上默认预制，但没有开启
开启方法： adb shell setprop presist.traced.enable 1

Perfetto实现类似systrace或atrace功能

adb shell perfetto -o /data/misc/perfetto-traces/trace -t 20s schedfreq idle am wm gfx view

adb shell perfetto \
  -c - --txt \
  -o /data/misc/perfetto-traces/trace \
<<EOF
duration_ms: 10000

buffers: {
    size_kb: 8960
    fill_policy: DISCARD
}
buffers: {
    size_kb: 1280
    fill_policy: DISCARD
}
data_sources: {
    config {
        name: "linux.ftrace"
        ftrace_config {
            ftrace_events: "sched/sched_switch"
            ftrace_events: "power/suspend_resume"
            ftrace_events: "sched/sched_process_exit"
            ftrace_events: "sched/sched_process_free"
            ftrace_events: "task/task_newtask"
            ftrace_events: "task/task_rename"
            ftrace_events: "ftrace/print"
            atrace_categories: "gfx"
            atrace_categories: "view"
            atrace_categories: "webview"
            atrace_categories: "camera"
            atrace_categories: "dalvik"
            atrace_categories: "power"
        }
    }
}
data_sources: {
    config {
        name: "linux.process_stats"
        target_buffer: 1
        process_stats_config {
            scan_all_processes_on_start: true
        }
    }
}

EOF

也可以将配置文件push进设备。如：
adb push config.txt /data/local/tmp/trace_config.txt
adb shell 'perfetto --txt -c - -o /data/misc/perfetto-traces/trace < /data/local/tmp/trace_config.txt'

二、Trace转换

支持的格式

text - protobuf text format: a text based representation of protos
json - Chrome JSON format: the format used by chrome://tracing
systrace: the ftrace text format used by Android systrace
profile (heap profiler only): pprof-like format. This is only valid for traces with native heap profiler dumps.

工具下载及用法

curl -LO https://get.perfetto.dev/traceconv
chmod +x traceconv
./traceconv [text|json|systrace|profile] [input proto file] [output file]

三、Heap profiling

环境配置

Android 10以上设备
如果是user版本需要在manifest配置profileable 或debuggable

<manifest ...>
    <application>
        <profileable android:shell="true"/>
        ...
    </application>
</manifest>

工具下载及抓取方法

curl -LO https://raw.githubusercontent.com/google/perfetto/master/tools/heap_profile
chmod +x heap_profile

./heap_profile -n system_server

四、LMK和oom_score_adj抓取

adb shell perfetto \
  -c - --txt \
  -o /data/misc/perfetto-traces/trace \
<<EOF

buffers: {
    size_kb: 8960
    fill_policy: DISCARD
}
buffers: {
    size_kb: 1280
    fill_policy: DISCARD
}
data_sources: {
    config {
        name: "linux.process_stats"
        target_buffer: 1
        process_stats_config {
            scan_all_processes_on_start: true
        }
    }
}
data_sources: {
    config {
        name: "linux.ftrace"
        ftrace_config {
            ftrace_events: "lowmemorykiller/lowmemory_kill"
            ftrace_events: "oom/oom_score_adj_update"
            ftrace_events: "ftrace/print"
            atrace_apps: "lmkd"
        }
    }
}
duration_ms: 60000

EOF

五、Java Heap

curl -LO https://raw.githubusercontent.com/google/perfetto/master/tools/java_heap_dump
chmod +x java_heap_dump

java_heap_dump -n com.android.systemui