Re: [PATCH] smp, ipi: Speed up IPI handling by invoking the callbacks in reverse order

[Peter Zijlstra]

On Thu, Jun 05, 2014 at 01:09:35AM +0530, Srivatsa S. Bhat wrote:
> The current implementation of lockless list (llist) has a drawback: if we
> want to traverse the list in FIFO order (oldest to newest), we need to
> reverse the list first (and this can be expensive if the list is large,
> since this is an O(n) operation).

Have you actually looked at the queue depth of this thing? Large queues
are a problem for interrupt latency.
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