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Before this commit we had two age counters: one global in HPA central and one local in each HPA shard. We used HPA shard counter, when we are reused empty pageslab and HPA central counter anywhere else. They suppose to be comparable, because we use them for allocation placement decisions, but in reality they are not, there is no ordering guarantees between them. At the moment, there is no way for pageslab to migrate between HPA shards, so we don't actually need HPA central age counter. |
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