linux-kernel - Re: [PATCH] sparse_irq aka dyn

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Message-ID: <491CC659.7030606@kernel.org>
Date:	Thu, 13 Nov 2008 16:29:13 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Mike Travis <travis@....com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sparse_irq aka dyn_irq v13

Mike Travis wrote:
> Yinghai Lu wrote:
>> Mike Travis wrote:
>>> Andrew Morton wrote:
>>>> On Thu, 13 Nov 2008 14:41:36 -0800
>>>> Yinghai Lu <yinghai@...nel.org> wrote:
>>>>
>>> That's a good question.  If there are 4k or 16k cpus, would the number of
>>> irq's being "kstat'd" need to be > 64k?  (I'm not exactly sure why there
>>> are NR_CPUS * NR_IRQS_LEGACY kstat entries per IRQ?)
>> can be replaced with nr_cpu_ids * NR_IRQS_LEGACY...
>>
>> YH
> 
> Ok, but why does each irq need a list of all other irq's in the system?
> Can they be collapsed into one array or percpu list?

use a big pointer array like struct irq_desc *desc[1<<32] ? that means 32g bytes... irq = bus/dev/fn/idx

or struct irq_desc *desc[NR_CPUS * NR_VECTORS] or per_cpu etc, it mean 4096*256*8 ... irq = cpu/idx


YH
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