Re: [PATCH] sparse_irq aka dyn_irq v13

[Yinghai Lu]

Mike Travis wrote:
> Yinghai Lu wrote:
>> Mike Travis wrote:
>>> Andrew Morton wrote:
>>>> On Thu, 13 Nov 2008 14:41:36 -0800
>>>> Yinghai Lu <yinghai@xxxxxxxxxx> 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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