linux-kernel - Re: [PATCH] new irq tracer

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Message-ID: <20090226153559.GC352@elte.hu>
Date:	Thu, 26 Feb 2009 16:35:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jason Baron <jbaron@...hat.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, fweisbec@...il.com
Subject: Re: [PATCH] new irq tracer


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 26 Feb 2009, Jason Baron wrote:
> > 
> > maybe...although that would require re-arranging the 'while' loop in
> > 'handle_IRQ_event' from a do..while loop to a 'while' loop, which will
> > require an extra branch check, and then we still have to record the last 'ret'
> > value. I'm not that keen on re-arranging this for trace data...
> > 
> > Using Steve's new 'DEFINE_TRACE_FMT', I can get function graph trace
> > as follows using the original two tracepoints (patch below):
> > 
> >  3)               |                      handle_IRQ_event() {
> >  3)               |                        /* (irq_handler_entry) irq=28 handler=eth0 */
> >  3)               |                        e1000_intr_msi() {
> >  3)   2.460 us    |                          __napi_schedule();
> >  3)   9.416 us    |                        }
> >  3)               |                        /* (irq_handler_exit) irq=28 handler=eth0 return=handled */
> >  3) + 22.935 us   |                      }
> > 
> > thanks,
> > 
> > -Jason
> 
> Looks good, one minor note:

[...]
> > +DEFINE_TRACE_FMT(irq_handler_entry,
> 
> I've renamed DEFINE_TRACE_FMT to TRACE_FORMAT. I believe that 
> is already in Ingo's tree.
> 
> Other than that:
> 
> Acked-by: Steven Rostedt <srostedt@...hat.com>

i've changed that in the patch and have applied Jason's patch to 
tip:tracing/ftrace. Thanks guys!

	Ingo
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