Re: Reading perf counters at ftrace trace boundaries
From: zhangwei(Jovi)
Date: Sun Aug 11 2013 - 22:25:25 EST
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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