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This creates a tasklet that only expects to be called when the LB algorithm is under contention when trying to reposition the server in its tree. Indeed, that's one of the operations that usually requires to take a write lock on a highly contended area, often for very little benefits under contention; indeed, under load, if a server keeps its previous position for a few extra microseconds, usually there's no harm. Thus this new tasklet can be woken up by the LB algo to ask the server to later call lbprm.server_requeue(). It does nothing else. |
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