Created
August 21, 2019 07:10
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How to run a daemon and collect ftrace from it. (The example is mm-qcamera-daemon)
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| #!/system/bin/sh | |
| echo 'function_graph' >/sys/kernel/debug/tracing/current_tracer | |
| echo 96000 > /d/tracing/buffer_size_kb | |
| echo $$ > /sys/kernel/debug/tracing/set_ftrace_pid | |
| echo 1 > /sys/kernel/debug/tracing/tracing_on | |
| ( | |
| sleep 10 # stop tracing after this second. | |
| echo 0 > /sys/kernel/debug/tracing/tracing_on | |
| cat /sys/kernel/debug/tracing/trace >/data/local/tmp/strace/qcamerasvr.ftrace | |
| echo 'nop' >/sys/kernel/debug/tracing/current_tracer | |
| ) & | |
| exec /system/bin/mm-qcamera-daemon |
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