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Start jemalloc background threads manually after hugifyText
Summary: We cannot have threads running when remapping hottext, so don't create background threads automatically. The background threads are only created for server mode, after hugefyText. Script mode won't have it, which I think is fine. When running against older versions of jemalloc (in some OSS builds), the mallctl will fail, and we log a line, but nothing bad happens. Reviewed By: markw65 Differential Revision: D7054160 fbshipit-source-id: 3e7e8d2f093d683270959cd240a9fa21d4f7df53
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