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

[Arnaldo Carvalho de Melo <acme@redhat.com>]

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@doppio 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@doppio 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