linux-kernel - Re: [PATCH v2][GIT PULL] tracing: add trace

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Date:	Thu, 4 Jun 2009 13:53:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2][GIT PULL] tracing: add trace_stack interface


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Tue, May 19, 2009 at 09:09:40PM -0400, Steven Rostedt wrote:
> > 
> > Ingo,
> > 
> > I rebased because I forgot to add EXPORT_SYMBOL_GPL.
> > 
> > -- Steve
> > 
> > Please pull the latest tip/tracing/ftrace tree, which can be found at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git
> > tip/tracing/ftrace
> > 
> > 
> > Steven Rostedt (1):
> >       tracing: add trace_stack interface
> > 
> > ----
> >  include/linux/kernel.h |    2 ++
> >  kernel/trace/trace.c   |   16 ++++++++++++++++
> >  2 files changed, 18 insertions(+), 0 deletions(-)
> > ---------------------------
> > commit 9f6b28655254b91c48f684b367ac14bfec0e180a
> > Author: Steven Rostedt <srostedt@...hat.com>
> > Date:   Tue May 19 18:54:16 2009 -0400
> > 
> >     tracing: add trace_stack interface
> >     
> >     This patch adds the global function
> >     
> >       void trace_stack(void)
> >     
> >     This allows a developer to find where a function is called. For example,
> >     if you want to know who calls __netif_reschedule, you can add
> >     
> >      static inline void __netif_reschedule(struct Qdisc *q)
> >      {
> >      	struct softnet_data *sd;
> >      	unsigned long flags;
> >     
> >     +	trace_stack();
> >      	local_irq_save(flags);
> >      	sd = &__get_cpu_var(softnet_data);
> >      	q->next_sched = sd->output_queue;
> >     
> >     And see the following in the trace output:
> >     
> >      <= __ftrace_trace_stack
> >      <= trace_stack
> >      <= __netif_schedule
> >      <= dev_watchdog
> >      <= run_timer_softirq
> >      <= __do_softirq
> >      <= call_softirq
> >      <= do_softirq
> >      <= irq_exit
> >     
> >     Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> 
> I wanted to use it to get the recursive locking points in reiserfs
> but I can't find it.
> 
> Has it been merged in -tip ?

hm, Steve has not sent it along AFAICS. There were no objections 
from me.

	Ingo
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