Yury Norov 714ca27e9b
crypto: iaa - Optimize rebalance_wq_table() ...
The function opencodes for_each_cpu() by using a plain for-loop. The
loop calls cpumask_weight() inside the conditional section. Because
cpumask_weight() is O(1), the overall complexity of the function is
O(node * node_cpus^2). Also, cpumask_nth() internally calls hweight(),
which, if not hardware accelerated, is slower than cpumask_next() in
for_each_cpu().
If switched to the dedicated for_each_cpu(), the rebalance_wq_table()
can drop calling cpumask_weight(), together with some housekeeping code.
This makes the overall complexity O(node * node_cpus), or simply speaking
O(nr_cpu_ids).
While there, fix opencoded for_each_possible_cpu() too.
Signed-off-by: Yury Norov <yury.norov@gmail.com >
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au >
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