linux-kernel - Re: [PATCH] v3 rudimentary tracing for Classic RCU

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Message-ID: <20081030155218.GA6162@linux.vnet.ibm.com>
Date:	Thu, 30 Oct 2008 08:52:18 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, rjw@...k.pl,
	dipankar@...ibm.com, tglx@...uxtronix.de, andi@...stfloor.org
Subject: Re: [PATCH] v3 rudimentary tracing for Classic RCU

On Wed, Oct 29, 2008 at 09:31:39AM +0800, Lai Jiangshan wrote:
> Paul E. McKenney wrote:
> 
> > Ported to 2.6.27 to ease testing, and fixed up the formatting a bit.
> > I remember quickly scanning through one-line-per-CPU data to find
> > problems with rcutree.c, but the expanded names are quite nice -- I
> > had to brutally abbreviate to fit each CPU on a single line.
> > And I agree that seqfile does work nicely for this.
> > 
> > I am strongly tempted to suggest CSV format output with headers to
> > allow the data to be pulled into gnumeric or oocalc -- this would
> > make handling large numbers of CPUs much easier.  (Quickly donning
> > the asbestos suit with titanium pinstripes...)
> 
> Hi, Paul,
> 	My patch is like an example, you do not need keep the
> codes that I have wrote. you can rewrite all of it. these files
> are only accessed by RCU guys, not users. and some file in /proc
> is very simple but easy to be read: /proc/stat, /proc/loadavg.

Hello, Jiangshan,

Good point -- I do very much appreciate the seqfile tutorial!!!

						Thanx, Paul
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