linux-kernel - Re: [PATCH V5] irq: Track the interrupt timings

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Message-ID: <57606068.3000209@linaro.org>
Date:	Tue, 14 Jun 2016 21:52:08 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:	shreyas@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, rafael@...nel.org, vincent.guittot@...aro.org
Subject: Re: [PATCH V5] irq: Track the interrupt timings

On 06/14/2016 08:11 PM, Thomas Gleixner wrote:
> On Tue, 14 Jun 2016, Nicolas Pitre wrote:
>> What about simply this:
>>
>> void __handle_timings(struct irq_desc *desc)
>> {
>> 	struct irq_timings *timings = this_cpu_ptr(desc->timings);
>> 	timings->w_index = (timings->w_index + 1) & IRQ_TIMINGS_MASK;
>> 	timings->values[timings->w_index] = local_clock();
>> }
>>
>> ?
>>
>> Then you could s/__handle_timings/__record_irq_time/ to better represent
>> what it does.  And both the difference and the summing of squares could
>> be done upon entering idle instead.
>
> And make it part of the handle_timings() inline to avoid the function call.

Ah yes, nice !


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