lkml.org 
[lkml]   [2008]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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@kernel.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


\
 
 \ /
  Last update: 2008-11-14 01:33    [W:0.062 / U:0.436 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site