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

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Message-ID: <20071108092806.GB2889@zaniah>
Date:	Thu, 8 Nov 2007 10:28:06 +0100
From:	Philippe Elie <phil.el@...adoo.fr>
To:	Haavard Skinnemoen <hskinnemoen@...el.com>
Cc:	oprofile-list@...ts.sourceforge.net, kernel@...32linux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH] AVR32: Oprofile support

On Wed, 07 Nov 2007 at 15:05 +0000, Haavard Skinnemoen wrote:

> This adds the necessary architecture code to run oprofile on AVR32
> using the performance counters documented by the AVR32 Architecture
> Manual.
> 
> Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>

> --- /dev/null
> +++ b/arch/avr32/oprofile/op_model_avr32.c
> @@ -0,0 +1,235 @@
> +/*


> +static irqreturn_t avr32_perf_counter_interrupt(int irq, void *dev_id)
> +{
> +	struct avr32_perf_counter *ctr = dev_id;
> +	struct pt_regs *regs;
> +	u32 pccr;
> +
> +	if (likely(!(intc_get_pending(AVR32_PERFCTR_IRQ_GROUP)
> +					& (1 << AVR32_PERFCTR_IRQ_LINE))))
> +		return IRQ_NONE;
> +
> +	regs = get_irq_regs();
> +	pccr = sysreg_read(PCCR);
> +
> +	/* Clear the interrupt flags we're about to handle */
> +	sysreg_write(PCCR, pccr);
> +
> +	/* 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 ?

-- 
regards,
Phe

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