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is a memory allocator for process globals and transient arenas. Spans of memory within the arena can be allocated to amortize the cost of allocations. The idea is to alloc chunks of memory within the arena, freeze the allocations, copy the contents into a larger arena block, and thaw away the old memory contents. This effectively allows for coalescence into a single memory block. \r\n\r\n- `MemArena` is self expanding, meaning that it will always return a large enough `MemSpan`. \r\n- It maintains the underlying memory using `MemArenaBlock`s which mark generations of the arena and increase in size by factors of 2 unless explicitly specified.  \r\n- `MemArena` is thread-safe."},"comment":{"url":"https://api.github.com/repos/apache/trafficserver/issues/comments/377312194","html_url":"https://github.com/apache/trafficserver/pull/3322#issuecomment-377312194","issue_url":"https://api.github.com/repos/apache/trafficserver/issues/3322","id":377312194,"user":{"login":"xf6wang","id":22967511,"avatar_url":"https://avatars1.githubusercontent.com/u/22967511?v=4","gravatar_id":"","url":"https://api.github.com/users/xf6wang","html_url":"https://github.com/xf6wang","followers_url":"https://api.github.com/users/xf6wang/followers","following_url":"https://api.github.com/users/xf6wang/following{/other_user}","gists_url":"https://api.github.com/users/xf6wang/gists{/gist_id}","starred_url":"https://api.github.com/users/xf6wang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/xf6wang/subscriptions","organizations_url":"https://api.github.com/users/xf6wang/orgs","repos_url":"https://api.github.com/users/xf6wang/repos","events_url":"https://api.github.com/users/xf6wang/events{/privacy}","received_events_url":"https://api.github.com/users/xf6wang/received_events","type":"User","site_admin":false},"created_at":"2018-03-29T17:31:13Z","updated_at":"2018-03-29T17:31:13Z","author_association":"NONE","body":"Removed mutex in `MemArena`"}}
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