linux-kernel - Re: [PATCH 1/2] x86, apic: optimize cpu traversal in __assign_irq

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Date:	Thu, 21 Jun 2012 10:31:47 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, yinghai@...nel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, gorcunov@...nvz.org
Subject: Re: [PATCH 1/2] x86, apic: optimize cpu traversal in
 __assign_irq_vector() using domain membership

On Tue, Jun 19, 2012 at 04:43:30PM -0700, Suresh Siddha wrote:
> Use the irq_cfg's old_domain to track the visited domains and optimize
> the cpu traversal while finding a free vector in the given cpumask.
> 
> NOTE: We can also optimize the search by using for_each_cpu and skip the
> current cpu, if it is not the first cpu in the mask returned by the
> vector_allocation_domain(). But re-using the cfg->old_domain to track
> the visited domains will be slightly faster.

Sorry for the dealy, Suresh.

You also need to kick out vector_allocation_domain's return value in all other
apic drivers.

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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