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Checkpoint should be triggered by a per VOS pool User Level Thread (ULT) regularly, the timing of checkpoint will be largely decided by the amount of committed transactions and the amount of WAL free space, to improve overall system efficiency, the activities of GC & aggregation could also be considered. On umempobj_close(), all committed transactions need be check-pointed for a clean close. A umem checkpoint interface will be provided, and it works as following:
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