linux-kernel - Re: [PATCH 1/2] tracing/core: introduce per cpu tracing files

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Message-ID: <20090225161309.GA5862@nowhere>
Date:	Wed, 25 Feb 2009 17:13:10 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/2] tracing/core: introduce per cpu tracing files

On Wed, Feb 25, 2009 at 02:02:02PM +0100, Ingo Molnar wrote:
> 
> * Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > Impact: split up tracing output per cpu
> 
> > So this patch creates a new directory inside /debug/tracing 
> > (provided you have a debugfs mountpoint on /debug). Inside 
> > this directory, you will now find one trace_pipe file, one 
> > trace file and one latency_trace file per cpu. Which means if 
> > you have two cpus, you will have:
> > 
> > trace0
> > trace1
> > trace_pipe0
> > trace_pipe1
> 
> Very nice! I've applied your patches to tip:tracing/ftrace.
> 
> Could you please do one more tweak? The /debug/tracing/per_cpu/ 
> directory looks a bit cluttered on a 16-way box. It would be a 
> nicer structure to have per CPU directories, i.e.:
> 
>  /debug/tracing/per_cpu/cpu0/trace
>  /debug/tracing/per_cpu/cpu0/trace_pipe
>  /debug/tracing/per_cpu/cpu1/trace
>  /debug/tracing/per_cpu/cpu1/trace_pipe
> 
> etc.

Ah right, the only SMP machine I have has two CPU so I didn't
think about that.

> 
> Besides being easier to handle, this also makes it easy to 
> extend the list of per CPU attributes as well, without 
> cluttering the /debug/tracing/per_cpu/ directory.
> 
> 	Ingo


You're right, I will change that.

Thanks.

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