Messages in this thread | | | Date | Mon, 12 Aug 2013 10:24:52 +0800 | From | "zhangwei(Jovi)" <> | Subject | Re: Reading perf counters at ftrace trace boundaries |
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On 2013/8/12 8:03, Karim Yaghmour wrote: > > Wondering if there's a way for reading perf counters in the kernel. I'd > like to read/record perf counters on ftrace function tracing > entries/exits to provide a rundown of the value of various counters on > function call boundaries. > > [ Steven: apologies for sending you a duplicate here of what I somewhat > already sent privately. ] >
If you want to base on ftrace, below two approach maybe take into use:
- register_ftrace_function/unregister_ftrace_function
- perf_event_create_kernel_counter (function event id is 1)
the first one is simplest, IMO.
You need to write your own kernel module to use these approach.
jovi.
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