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

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Date:	Sun, 24 Nov 2013 16:32:53 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	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

(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.

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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