linux-kernel - Re: [PATCH] module: ppc64 module CRC relocation fix causes perf issues

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Date:	Wed, 24 Jul 2013 14:22:53 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Michael Ellerman <michael@...erman.id.au>
CC:	Anton Blanchard <anton@...ba.org>,
	Neil Horman <nhorman@...driver.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	<linux-kernel@...r.kernel.org>, Paul Mackerras <paulus@...ba.org>,
	<linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] module: ppc64 module CRC relocation fix causes perf
 issues

On 07/23/2013 08:30:32 AM, Michael Ellerman wrote:
> On Fri, Jul 19, 2013 at 05:59:30PM -0500, Scott Wood wrote:
> > On 07/17/2013 11:00:45 PM, Anton Blanchard wrote:
> > >
> > >Hi Scott,
> > >
> > >> What specifically should I do to test it?
> > >
> > >Could you double check perf annotate works? I'm 99% sure it will  
> but
> > >that is what was failing on ppc64.
> >
> > I'm not really sure what it's supposed to look like when "perf
> > annotate" works.  It spits a bunch of unreadable[1]
> > dark-blue-on-black assembly code at me, all with "0.00 :" in the
> > left column.
> >
> > Oh, wait -- some lines have "100.00 : " on the left, in
> > even-more-unreadable dark-red-on-black.
> >
> > Apart from the annoying colors, is there anything specific I should
> > be looking for?  Some sort of error message, or output that actually
> > makes sense?
> 
> The colours look fine on my terminal, so I don't know what you've done
> there.

It probably looks better if the terminal is configured to have a light  
background (which of course makes some other programs look worse), or  
(as I noted) if you've got your monitor set to be very bright.  I now  
see that xfce4-terminal lets me redefine the standard colors, though,  
so that should help.

> If you care you can use "--stdio" to use the plainer interface,
> though it still uses colours.
> 
> That output looks fine in terms of the bug Anton was chasing. As far  
> as
> only ever hitting one instruction that does look weird.

OK.  I'll add "investigate weird e500 perf annotate results" to the  
TODO list...

-Scott
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