linux-kernel - Re: [PATCH 1/2] tracing/core: make the per cpu trace files in per cpu directories

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Message-ID: <20090226132227.GA17530@elte.hu>
Date:	Thu, 26 Feb 2009 14:22:27 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: Re: [PATCH 1/2] tracing/core: make the per cpu trace files in per
	cpu directories


* Ingo Molnar <mingo@...e.hu> wrote:

> * Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > Impact: scale per cpu tracing
> > 
> > The per cpu trace files are all in a single directory: 
> > /debug/tracing/per_cpu. In case of a large number of cpu, the 
> > content of this directory becomes messy so we create now one 
> > directory per cpu inside /debug/tracing/per_cpu which contain 
> > each their own trace_pipe and trace files.
> 
> Applied to tip:tracing/ftrace, thanks Frederic!

The layout looks much more structured on a 16-way box now:

phoenix:/debug/tracing/per_cpu> ll
total 0
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu0
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu1
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu10
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu11
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu12
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu13
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu14
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu15
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu2
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu3
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu4
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu5
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu6
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu7
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu8
drwxr-xr-x 2 root root 0 2009-02-26 14:19 cpu9
phoenix:/debug/tracing/per_cpu> cd cpu0
phoenix:/debug/tracing/per_cpu/cpu0> ll
total 0
-r--r--r-- 1 root root 0 2009-02-26 14:19 trace
-r--r--r-- 1 root root 0 2009-02-26 14:19 trace_pipe
phoenix:/debug/tracing/per_cpu/cpu0> 

	Ingo
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