Messages in this thread | | | Date | Mon, 4 Feb 2008 11:30:01 +0100 | From | Andi Kleen <> | Subject | Re: [rfc] direct IO submission and completion scalability issues |
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> + q = &__get_cpu_var(call_single_queue); > + spin_lock_irqsave(&q->lock, flags); > + list_replace_init(&q->list, &list); > + spin_unlock_irqrestore(&q->lock, flags);
I think you could do that lockless if you use a similar data structure as netchannels (essentially a fixed size single buffer queue with atomic exchange of the first/last pointers) and not using a list. That would avoid at least one bounce for the lock and likely another one for the list manipulation.
Also the right way would be to not add a second mechanism for this, but fix the standard smp_call_function_single() to support it.
-Andi
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