A prototype patch is posted to -patches, which is WORK IN PROGRESS.
[This patch matches discussion thread on -hackers.]

The following TODO items remain

1. discuss which process will issue regular XLogFlush(). If agreed,
implement WALWriter process to perform this task. (Yes, the patch isn't
fully implemented, yet).
2. remove fsync parameter
3. Prevent COMMIT NOWAIT when commit_delay = 0
4. Discuss whether commit_delay is OK to usurp; twas just an earlier
suggestion from someone else, can go either way.
5. docs

--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com



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