linux-kernel - Re: [PATCH 1/2] x86, irq: update irq_cfg domain unless the new affinity is a subset of the current domain

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Date:	Mon, 18 Jun 2012 17:51:37 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	yinghai@...nel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
	gorcunov@...nvz.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 1/2] x86, irq: update irq_cfg domain unless the new
 affinity is a subset of the current domain

On Mon, 2012-06-18 at 11:17 +0200, Alexander Gordeev wrote:
> I would suggest to go further and generalize your idea and introduce something
> like compare_domains() instead sub_domain flag. This would help us to keep/let
> __assign_irq_vector() be more generic and hide domains treating logic in
> drivers.

That sounds good.

> @@ -1138,47 +1138,50 @@ __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
>  		int new_cpu;
>  		int vector, offset;
>  		bool more_domains;
> +		int cmp_domains;
>  
> -		more_domains = apic->vector_allocation_domain(cpu, tmp_mask);
> +		more = apic->vector_allocation_domain(cpu, mask, tmp_mask);
> +		cmp = apic->compare_domains(tmp_mask, cfg->domain);

I think we should be able to consolidate both of them into one
apic_driver specific routine. Also I think we should be able to use the
tmp_mask in each round and minimize the number of unnecessary
for_each_cpu iterations. And that should clean up the more_domains bool
logic we did earlier.

Will post the complete patch in a day.

thanks,
suresh



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