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(parent: 02d88ef) | patch

Wakeup WALWriter as needed for asynchronous commit performance.

Wakeup WALWriter as needed for asynchronous commit performance.
Previously we waited for wal_writer_delay before flushing WAL. Now
we also wake WALWriter as soon as a WAL buffer page has filled.
Significant effect observed on performance of asynchronous commits
by Robert Haas, attributed to the ability to set hint bits on tuples
earlier and so reducing contention caused by clog lookups.

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