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

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Message-ID: <20080804171856.GB17964@ghostprotocols.net>
Date:	Mon, 4 Aug 2008 14:18:56 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	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

Em Mon, Aug 04, 2008 at 12:28:12PM -0400, Steven Rostedt escreveu:
> 
> 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

For the drivers that do proper namespacing, yes, that should be enough
in most cases :)

- Arnaldo
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