linux-kernel - Re: [PATCH -tip] perf_counter tools: shorten names for events

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Date:	Fri, 26 Jun 2009 20:47:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Roland Dreier <rdreier@...co.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] perf_counter tools: shorten names for events


* Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:

> On Thu, 2009-06-25 at 17:34 +0200, Ingo Molnar wrote:
> > * Roland Dreier <rdreier@...co.com> wrote:
> > 
> > >  >       266590464  L1d-loads             (scaled from 23.03%)
> > > 
> > > IMHO "L1d" is too abbreviated for it to be obvious that it means 
> > > L1 data cache.  If you want something really short maybe "L1-d$" 
> > > might be a little clearer, but I stil like "L1-dcache" best.
> > 
> > i changed it to L1-d$ / L1-i$.
> > 
> > > The formatting of aligning things is nice defitely but we could 
> > > also shorten lines by saying "scaled from" in fewer characters 
> > > maybe?  (I have to admit I don't know what "scaled from X%" means 
> > > in this case so I can't suggest something better, but the fact 
> > > that I can't easily tell what it means probably suggests that the 
> > > wording could be improved)
> > 
> > Indeed, the '(scaled from 12.3%)' message should i guess be changed 
> > to:
> > 
> >   (9.43x scaled)
> > 
> > ( and a multiplicative factor is more expressive anyway, than the 
> >   percentage of from where we scale up. )
> > 
> 
> Can you please let me know how you get 9.43x from 12.3%

it was a guesstimate - the real factor is 8.13x

from X percentage scaling factor you get to the multiplier factor by 
doing:

   100.0 / X

	Ingo
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