From: "zhangwei(Jovi)" <jovi.zhangwei@huawei.com>
To: Karim Yaghmour <karim.yaghmour@opersys.com>
Cc: <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>, <mingo@elte.hu>
Subject: Re: Reading perf counters at ftrace trace boundaries
Date: Mon, 12 Aug 2013 10:24:52 +0800 [thread overview]
Message-ID: <52084774.7010009@huawei.com> (raw)
In-Reply-To: <5208263D.2080205@opersys.com>
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.
next prev parent reply other threads:[~2013-08-12 2:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-12 0:03 Reading perf counters at ftrace trace boundaries Karim Yaghmour
2013-08-12 1:23 ` Andi Kleen
2013-08-12 1:39 ` Karim Yaghmour
2013-08-12 1:47 ` Andi Kleen
2013-08-12 1:59 ` Karim Yaghmour
2013-08-12 2:24 ` zhangwei(Jovi) [this message]
2013-08-12 15:26 ` Karim Yaghmour
2013-08-13 7:12 ` zhangwei(Jovi)
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