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Simon Marlow authored
Summary: Knowing the length of the run queue in O(1) time is useful: for example we don't have to traverse the run queue to know how many threads we have to migrate in schedulePushWork(). Test Plan: validate Reviewers: ezyang, erikd, bgamari, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2437
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