linux-kernel - Re: [PATCH 4/5] tracing/core: drop the cpu field from trace

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Message-ID: <20090209140321.GA20758@elte.hu>
Date:	Mon, 9 Feb 2009 15:03:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 4/5] tracing/core: drop the cpu field from trace_entry


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

> On Mon, Feb 09, 2009 at 10:53:24AM +0100, Ingo Molnar wrote:
> > 
> > * Frederic Weisbecker <fweisbec@...il.com> wrote:
> > 
> > > Impact: fix a bug on cpu output
> > > 
> > > While looking on the function tracer traces, I first cheered up:
> > > 
> > >             TASK-PID    CPU#    TIMESTAMP  FUNCTION
> > >                | |       |          |         |
> > >          firefox-4622  [081]  1315.790405: lapic_next_event <-clockevents_program_event
> > >          firefox-4622  [178]  1315.790405: native_apic_mem_write <-lapic_next_event
> > >          firefox-4622  [020]  1315.790406: perf_counter_unthrottle <-smp_apic_timer_interrupt
> > > 
> > > But no, actually I don't have so many cpus...
> > 
> > incidentally, Steve came up with the exact same patch :)
> > 
> > 	Ingo
> 
> Heh, I guess the moon inspired both of us in the name of tracing, or
> something like that...

It was exactly at around the time Thomas complained over IRC
about the visible CPU# breakage in the tracer output.

So i blame it on telepathy ;-)

	Ingo
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