linux-kernel - Re: Reading perf counters at ftrace trace boundaries

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Date:	Mon, 12 Aug 2013 10:24:52 +0800
From:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
To:	Karim Yaghmour <karim.yaghmour@...rsys.com>
CC:	<linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>, <mingo@...e.hu>
Subject: Re: Reading perf counters at ftrace trace boundaries

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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