linux-kernel - Re: [PATCH v1 1/2] PM/runtime: introduce trace points for tracing rpm

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Date:	Tue, 27 Sep 2011 16:43:52 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	tom.leiming@...il.com, stern@...land.harvard.edu,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com, fweisbec@...il.com,
	Ming Lei <ming.lei@...onical.com>
Subject: Re: [PATCH v1 1/2] PM/runtime: introduce trace points for tracing
 rpm_* functions

On Tue, 2011-09-27 at 22:36 +0200, Rafael J. Wysocki wrote:

> > 	TP_printk("%pS:%s ret=%d", (void *)__entry->ip, __get_str(name),
> > 		__entry->ret)
> > 
> > try that.
> 
> Well, that certainly will work, but is it the right fix?

Hehe, yes!  The pS means to take a pointer and return the string version
of the address. Like "schedule+0x3a". __entry->ip is the address of the
function that called it __THIS_IP__ but we want to convert that into a
string name.

We use ip because both perf and trace-cmd should be smart enough to
parse it too. As they both store the kallsyms into the data file.

The (void *) is used because pS wants a pointer, and we stored the
address as an unsigned long.

-- Steve

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