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That's the same principle as for ->allocated. The small difference here is that it's no longer possible to decrement ->used in batches when releasing clusters from the cache to the shared cache, so the counter has to be decremented for each of them. But as it provides less contention and it's done only during forced eviction, it shouldn't be a problem. A function "pool_used()" was added to return the sum of the entries. It's used by pool_alloc_nocache() and pool_free_nocache() which need to count the number of used entries. It's not a problem since such operations are done when picking/releasing objects to/from the OS, but it is a reminder that the number of buckets should remain small. With this change, an h2load test made of 5 * 160 conn * 40 streams on 80 threads raised from 812k RPS to 1.5M RPS.