linux-kernel - Re: [PATCH tip 1/1] tracing: handle unregistering the current tracer

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Message-ID: <20090209115825.GA17782@elte.hu>
Date:	Mon, 9 Feb 2009 12:58:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH tip 1/1] tracing: handle unregistering the current
	tracer


* Arnaldo Carvalho de Melo <acme@...hat.com> wrote:

> Em Mon, Feb 09, 2009 at 10:58:16AM +0100, Ingo Molnar escreveu:
> > 
> > * Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> > 
> > > Impact: simplification
> > > 
> > > Instead of requiring that plugins have the sequence:
> > > 
> > >   my_tracer_stop(my_trace_array);
> > >   unregister_tracer(my_tracer);
> > > 
> > > it should be possible just do a:
> > > 
> > >   unregister_tracer(my_tracer);
> > > 
> > > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > > ---
> > >  kernel/trace/trace.c |    9 +++++++++
> > >  1 files changed, 9 insertions(+), 0 deletions(-)
> > 
> > Applied to tip/tracing/ftrace, thanks Arnaldo!
> > 
> > Nice one - we should try to shoot for the smallest physically
> > possible linecount for any new (possibly trivial) tracer plugin.
> 
> That and also for as few as possible EXPORT_SYMBOL_GPL entries, now, for
> converting net/ipv4/tcp_probe.c to an ftrace plugin + one tracepoint at
> tcp_rcv_established we need:
> 
> doppio linux-2.6-tip]$ grep ^+EXPORT_SYMBOL ~/tcp_cwnd_tracer.patch 
> +EXPORT_SYMBOL_GPL(register_tracer);
> +EXPORT_SYMBOL_GPL(unregister_tracer);
> +EXPORT_SYMBOL_GPL(tracing_record_cmdline);
> +EXPORT_SYMBOL_GPL(trace_buffer_lock_reserve);
> +EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit);
> +EXPORT_SYMBOL_GPL(trace_seq_printf);
> +EXPORT_SYMBOL_GPL(register_ftrace_event);
> +EXPORT_SYMBOL_GPL(unregister_ftrace_event);
> [acme@...pio linux-2.6-tip]$

ok. For in-kernel plugins it's of course fine to do those exports in any case.

	Ingo
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