linux-kernel - Re: [RFC] ftrace: support tracing functions in one module

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Message-ID: <y0mljzee1f3.fsf@ton.toronto.redhat.com>
Date:	Sun, 03 Aug 2008 08:19:28 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	"Ming Lei" <tom.leiming@...il.com>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Steven Rostedt" <srostedt@...hat.com>
Subject: Re: [RFC] ftrace: support tracing functions in one module

"Ming Lei" <tom.leiming@...il.com> writes:

> [...]  For example, one may only have interest in functions calling
> in usbcore.ko, but he must trace all the functions calling in the
> kernel, so the tracing result is too large to use it. [...]

Until ftrace gains this ability, you could use systemtap:

# cat callret.stp
probe $1.call { printf ("%s <- %s\n", thread_indent(1), probefunc()) }
probe $1.return { printf ("%s -> %s\n", thread_indent(-1), probefunc()) }
# stap callret.stp 'module("usbcore").function("*")'
[...]
^C
#

(One can also add conditions based on function parameters, processes,
whatever; soon it'll be easy to trace all function parameters.)


- FChE
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