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(parent: f0bfc02) | patch

Arrange to call AbsorbFsyncRequests every so often while performing a

Arrange to call AbsorbFsyncRequests every so often while performing a
checkpoint in the bgwriter. This forestalls overflow of the fsync request
queue, which is not fatal but causes considerable performance degradation
when it occurs (because backends then have to do their own fsyncs). Per
patch from Itagaki Takahiro, modified a little bit by me.

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