linux-kernel - Re: [PATCH 1/1] tracing: Introduce "pseudo registers" for FETCH_MTD

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Message-ID: <877gbwsy8w.fsf@sejong.aot.lge.com>
Date:	Mon, 25 Nov 2013 17:04:47 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] tracing: Introduce "pseudo registers" for FETCH_MTD_reg

On Sun, 24 Nov 2013 16:32:53 +0900, Masami Hiramatsu wrote:
> (2013/11/24 5:16), Oleg Nesterov wrote:
>> The probe can dump the registers or memory, but it is not possible
>> to dump, say, current->pid. This patch adds the pseudo regs table,
>> currently it has only two methods to get current/smp_processor_id
>> but it can be trivially extended.
>
> Good catch! :)
>
>> This syntax is %%pseudo-reg-name, I agree in advance with any other
>> naming.
>
> For this kind of use, kprobe-tracer already provides '$' prefix :)
> e.g. $stack, $retval etc. Please see parse_probe_vars in trace_probe.c.
>
> So, $current and $cpu is better for me.

Agreed.

Thanks,
Namhyung
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