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SubjectAn small ftrace enhancement idea
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Dear Steven,

I want to add a new function to ftrace subsystem. Sometimes, we will face such a problem: system do not response to the input on time one to two times everyday. It is not easy to capture because it rarely happens. So I want to add a function to the kernel. If I have such problem, I insert a kernel module, who add a hook to the position that receive the input and another to the position that response to the input (with a session id if necessary). And I can compare the time between them and if the period is longer then a pre-set threshold, I can give a signal to a user helper application (maybe a script waiting on the file), which then can save the trace event to a file for later inspection.



The user helper script may look like this:



#/bin/sh



echo ‘sched:*’ > /sys/kernel/debug/tracing/set_event

modprobe delay_inspector.ko threshold=500

cat /sys/kernel/debug/tracing/waiter #wait for signal

cp /sys/kernel/debug/tracing/trace /var/log/delay_infomation





It looks like a standalone function. But I don’t have place to put it. Do you think I can implement it in ftrace? And do you think if there are better solution?



Thank you.



Kenneth Lee--
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