Re: [PATCH V2] x86: irq vector assignment

From: Jack Steiner
Date: Wed Jun 30 2010 - 11:08:39 EST

Try to assign irq vectors to cpus on the correct node & fall back to global
assignment only if node-local fails. This reduces the chances of
using all of the interrupt vectors of a single cpu.

Signed-off-by: Jack Steiner <steiner@xxxxxxx>


V2 - Fix error for builds without CONFIG_NUMA.

On Thu, Jun 24, 2010 at 01:45:40PM -0700, Yinghai Lu wrote:
> how about update apic::target_cpus() to take node?

I may be overlooking something but I don't see the benefit of passing node to target_cpus().
It looks like only 1 place that calls target_cpus() has a valid "node". The other places would
pass -1. In addition, I'm not sure how some of the other subarches (ex., es7000_32) would
use the node number. Many would just ignore it.

arch/x86/kernel/apic/io_apic.c | 5 +++++
1 file changed, 5 insertions(+)

Index: linux/arch/x86/kernel/apic/io_apic.c
--- linux.orig/arch/x86/kernel/apic/io_apic.c 2010-06-25 08:11:07.186867196 -0500
+++ linux/arch/x86/kernel/apic/io_apic.c 2010-06-25 08:41:51.790274150 -0500
@@ -3265,6 +3265,11 @@ unsigned int create_irq_nr(unsigned int
desc_new = move_irq_desc(desc_new, node);
cfg_new = desc_new->chip_data;

+ if (node >= 0 && __assign_irq_vector(new, cfg_new, node_to_cpumask_map[node]) == 0)
+ irq = new;
+ else
if (__assign_irq_vector(new, cfg_new, apic->target_cpus()) == 0)
irq = new;
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