方法写在external/perfetto/perfetto.rc中:
#############################################################################
# perfetto_trace_on_boot - Starts a perfetto trace on boot
#############################################################################
#
# There are two separate actions (a trigger action and a start action) to make
# sure that perfetto_trace_on_boot is started only once on boot (otherwise,
# whenever persist.debug.perfetto.boottrace=1 is set, perfetto_trace_on_boot
# would start immediately).
#
# persist.debug.perfetto.boottrace=1 can be manually set after boot (to record
# a trace on the next reboot) and we don't want to immediately start a trace
# when setting the debug property. So we turn "ro.persistent_properties.ready"
# into a trigger, and then check whether we should start tracing when the
# trigger fires.
on perfetto_maybe_trace_on_boot && property:persist.debug.perfetto.boottrace=1 && property:persist.traced.enable=1
setprop persist.debug.perfetto.boottrace ""
rm /data/misc/perfetto-traces/boottrace.perfetto-trace
# Set by traced after listen()ing on the consumer socket. Without this,
# perfetto could try to connect to traced before traced is ready to listen.
wait_for_prop sys.trace.traced_started 1
start perfetto_trace_on_boot
on property:ro.persistent_properties.ready=true
trigger perfetto_maybe_trace_on_boot
service perfetto_trace_on_boot /system/bin/perfetto -c /data/misc/perfetto-configs/boottrace.pbtxt --txt -o /data/misc/perfetto-traces/boottrace.perfetto-trace
disabled
gentle_kill
oneshot
user shell
group nobody
操作步骤：
- 把perfetto配置文件
boottrace.pbtxt放到/data/misc/perfetto-configs/boottrace.pbtxt中。 - 确保
getprop persist.traced.enable返回1。 - 执行
setprop persist.debug.perfetto.boottrace 1 - 重启后，当次开机的trace就在
/data/misc/perfetto-traces/boottrace.perfetto-trace
注意事项：
- 尽量只抓必要的信息，不然抓取的数据量超过文件大小上限会出现大量log未闭合或目标过程被冲掉的情况。
- 抓出来的boottrace.perfetto-trace可以在 ui.perfetto.dev/ 上查看。
- boottrace.pbtxt示例：
buffers: {
size_kb: 260096
fill_policy: RING_BUFFER
}
buffers: {
size_kb: 2048
fill_policy: RING_BUFFER
}
data_sources: {
config {
name: "android.packages_list"
target_buffer: 1
}
}
data_sources: {
config {
name: "linux.process_stats"
target_buffer: 1
process_stats_config {
scan_all_processes_on_start: true
}
}
}
data_sources: {
config {
name: "android.log"
android_log_config {
log_ids: LID_EVENTS
log_ids: LID_CRASH
log_ids: LID_KERNEL
log_ids: LID_DEFAULT
log_ids: LID_RADIO
log_ids: LID_SECURITY
log_ids: LID_STATS
log_ids: LID_SYSTEM
}
}
}
data_sources: {
config {
name: "linux.ftrace"
ftrace_config {
ftrace_events: "sched/sched_switch"
ftrace_events: "power/suspend_resume"
ftrace_events: "sched/sched_wakeup"
ftrace_events: "sched/sched_wakeup_new"
ftrace_events: "sched/sched_waking"
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: "am"
atrace_categories: "adb"
atrace_categories: "aidl"
atrace_categories: "dalvik"
atrace_categories: "audio"
atrace_categories: "binder_lock"
atrace_categories: "binder_driver"
atrace_categories: "bionic"
atrace_categories: "camera"
atrace_categories: "database"
atrace_categories: "gfx"
atrace_categories: "hal"
atrace_categories: "input"
atrace_categories: "network"
atrace_categories: "nnapi"
atrace_categories: "pm"
atrace_categories: "power"
atrace_categories: "rs"
atrace_categories: "res"
atrace_categories: "rro"
atrace_categories: "sm"
atrace_categories: "ss"
atrace_categories: "vibrator"
atrace_categories: "video"
atrace_categories: "view"
atrace_categories: "webview"
atrace_categories: "wm"
atrace_apps: "*"
}
}
}
duration_ms: 40000
write_into_file: true
file_write_period_ms: 2500
max_file_size_bytes: 500000000
flush_period_ms: 30000
incremental_state_config {
clear_period_ms: 5000
}
