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From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	Namhyung Kim <namhyung.kim@lge.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@redhat.com>, Jiri Olsa <jolsa@redhat.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] tracing: Introduce "pseudo registers" for FETCH_MTD_reg
Date: Sun, 24 Nov 2013 16:32:53 +0900	[thread overview]
Message-ID: <5291ABA5.7030505@hitachi.com> (raw)
In-Reply-To: <20131123201605.GB22148@redhat.com>

(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@hitachi.com



  reply	other threads:[~2013-11-24  7:32 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-23 20:15 [PATCH 0/1] " Oleg Nesterov
2013-11-23 20:16 ` [PATCH 1/1] " Oleg Nesterov
2013-11-24  7:32   ` Masami Hiramatsu [this message]
2013-11-25  8:04     ` Namhyung Kim
2013-11-25 14:35       ` Oleg Nesterov
2013-11-25 17:21 ` [RFC PATCH 0/3] tracing: Teach FETCH_MTD_{symbol,deref} to handle per-cpu data Oleg Nesterov
2013-11-25 17:21   ` [RFC PATCH 1/3] tracing: Don't mangle sc->addr in update_symbol_cache() Oleg Nesterov
2013-11-25 17:21   ` [RFC PATCH 2/3] tracing: introduce {calc,parse}_probe_offset() for FETCH_MTD_{symbol,deref} Oleg Nesterov
2013-11-25 17:22   ` [RFC PATCH 3/3] tracing: Teach FETCH_MTD_{symbol,deref} to handle per-cpu data Oleg Nesterov
2013-11-26  9:34     ` Masami Hiramatsu
2013-11-26 17:43       ` [RFC PATCH 0/2] tracing: Teach FETCH_MTD_symbol " Oleg Nesterov
2013-11-26 17:44         ` [RFC PATCH 1/2] tracing: Don't update sc->addr in update_symbol_cache() Oleg Nesterov
2013-11-26 17:44         ` [RFC PATCH 2/2] tracing: Teach FETCH_MTD_symbol to handle per-cpu data Oleg Nesterov
2013-11-26 17:50           ` modules, add_kallsyms() && DEFINE_PER_CPU Oleg Nesterov
2013-11-27  2:23             ` Masami Hiramatsu
2013-11-27  8:20               ` Namhyung Kim
2013-11-27 11:22                 ` Masami Hiramatsu
2013-11-27 13:35               ` Oleg Nesterov
2013-11-28  2:02                 ` Masami Hiramatsu
2013-11-27 11:30           ` [RFC PATCH 2/2] tracing: Teach FETCH_MTD_symbol to handle per-cpu data Masami Hiramatsu
2013-11-27  0:37         ` [RFC PATCH 0/2] " Namhyung Kim
2013-11-27 10:01         ` Masami Hiramatsu
2013-11-27 17:41           ` Oleg Nesterov
2013-11-28  2:55             ` Masami Hiramatsu
2013-11-25 19:29 ` [PATCH 0/2] tracing: Add $cpu and $current probe-vars Oleg Nesterov
2013-11-25 19:29   ` [PATCH 1/2] " Oleg Nesterov
2013-11-26  2:21     ` Masami Hiramatsu
2013-11-26 17:23       ` Oleg Nesterov
2013-11-27  8:22         ` Masami Hiramatsu
2013-11-27 17:05           ` Oleg Nesterov
2013-11-28  2:51             ` Masami Hiramatsu
2013-11-25 19:30   ` [PATCH 2/2] tracing: Kill FETCH_MTD_retval, reimplement $retval via pseudo_reg_retval() Oleg Nesterov

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