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

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Message-ID: <alpine.DEB.1.10.0808041225330.19776@gandalf.stny.rr.com>
Date:	Mon, 4 Aug 2008 12:28:12 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
cc:	Ming Lei <tom.leiming@...il.com>, 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


On Mon, 4 Aug 2008, Arnaldo Carvalho de Melo wrote:
> > 
> > Do you have the plan to support tracing functions in one module or in one kernel
> > address range?
> 
> What about using:
> 
> [acme@...pio pahole]$ nm --defined-only /usr/lib/debug/lib/modules/2.6.24.7-75.el5rt/kernel/drivers/net/tg3.ko.debug | grep ' t ' | cut -d' ' -f3 | head 
> __tg3_set_coalesce
> __tg3_set_mac_addr
> __tg3_set_rx_mode
> _tw32_flush
> tg3_5700_link_polarity
> tg3_abort_hw
> tg3_alloc_rx_skb
> tg3_ape_driver_state_change
> tg3_bmcr_reset
> tg3_change_mtu
> [acme@...pio pahole]$
> 
> Feed this to /sys/kernel/debug/tracing/set_ftrace_filter and you should
> be set, no?
> 
> Ok, you need to have the kernel-debuginfo package installed, and I guess
> we can get away with that, but for now, isn't that enough?


Or simply (again for tg3 :


# awk '/\[tg3\]/ { print $3 }' /proc/kallsyms  \
   > /debug/tracing/set_ftrace_filter

-- Steve

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