linux-kernel - Re: Is it supported to perf probe data?

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Date:	Tue, 21 Sep 2010 09:19:13 +0800
From:	Luming Yu <luming.yu@...il.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	2nddept-manager@....hitachi.co.jp
Subject: Re: Is it supported to perf probe data?

On Tue, Sep 21, 2010 at 7:54 AM, Masami Hiramatsu
<masami.hiramatsu.pt@...achi.com> wrote:
> Hi Luming,
>
> (2010/09/20 17:03), Luming Yu wrote:
>> Hi there,
>>
>> I need to analyze accessing pattern to a data in kernel. Wanna to
>> check with you if perf probe can help to get that trace.
>
> Yes, perf probe can add new trace events which can be used
> from perf record/report/trace or ftrace as same as other pre-defined
> trace events. Those new events can record variables as arguments too.
> So you can define new events with accessed data, record it by perf record,
> and see it by perf trace.

e.g. I need to trace accessing to thread_info.flags of a specific task,
would you please show me an example how to do it.

Thanks,
Luming
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