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

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Date:	Mon, 12 Aug 2013 12:26:57 -0300
From:	Karim Yaghmour <karim.yaghmour@...rsys.com>
To:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.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 13-08-11 11:24 PM, zhangwei(Jovi) wrote:
> 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.

Thx for the pointers.

> You need to write your own kernel module to use these approach.

As a proof-of-concept, sure. For something more permanent it would make
more sense to adapt the various perf/ftrace tools to make this available
on the command line with other options. But we're far away from that for
the moment.

-- 
Karim Yaghmour
CEO - Opersys inc. / www.opersys.com
http://twitter.com/karimyaghmour

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