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421b17a622
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.
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: https://jemalloc.net/