linux-kernel - Re: [RFC/PATCH] AVR32: Oprofile support

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Date:	Thu, 8 Nov 2007 12:14:13 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	Philippe Elie <phil.el@...adoo.fr>
Cc:	oprofile-list@...ts.sourceforge.net, kernel@...32linux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH] AVR32: Oprofile support

On Thu, 8 Nov 2007 10:28:06 +0100
Philippe Elie <phil.el@...adoo.fr> wrote:

> On Wed, 07 Nov 2007 at 15:05 +0000, Haavard Skinnemoen wrote:
> > +	/* PCCNT */
> > +	if (ctr->enabled && (pccr & ctr->flag_mask)) {
> > +		sysreg_write(PCCNT, -ctr->count);
> > +		oprofile_add_sample(regs, PCCNT);
> > +	}
> > +	ctr++;
> > +	/* PCNT0 */
> > +	if (ctr->enabled && (pccr & ctr->flag_mask)) {
> > +		sysreg_write(PCNT0, -ctr->count);
> > +		oprofile_add_sample(regs, PCNT0);
> > +	}
> > +	ctr++;
> > +	/* PCNT1 */
> > +	if (ctr->enabled && (pccr & ctr->flag_mask)) {
> > +		sysreg_write(PCNT1, -ctr->count);
> > +		oprofile_add_sample(regs, PCNT1);
> > +	}
> 
> Why not a loop here ?

The system register is coded into the instruction as an immediate, so
it would have to be a loop with a switch in it. And with only three
counters, I thought it looked cleaner (and faster) this way.

Håvard
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