Re: Improve read_local_xlog_page_guts by replacing polling with latch-based waiting

[Xuneng Zhou]

Hi,

Some changes in v3:
1) Update the note of xlogwait.c to reflect the extending of its use
for flush waiting and internal use for both flush and replay waiting.
2) Update the comment above logical_read_xlog_page which describes the
prior-change behavior of read_local_xlog_page.

Best,
Xuneng

v8-0001-Implement-WAIT-FOR-command.patch
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v3-0000-cover-letter.patch
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v3-0002-Improve-read_local_xlog_page_guts-by-replacing-po.patch
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