Re: hot cache line due to note_interrupt()

[Anton Blanchard]

> The answer to this is probably alloc_percpu for the counters.
> right now this might not possible because irq_desc_t table might be used very
> early, and alloc_percpu uses slab underneath.  alloc_percpu will have to be 
> made to work early enough for this....

Also keep in mind the memory bloat with high NR_IRQS and NR_IRQS.

Anton
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