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Provide interim statistics while in mid-checkpoint.

Re-implements similar functionality in 9.1 and previously whichwas removed during split of checkpointer and bgwriter.Requested/spotted by Magnus Hagander

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src/backend/postmaster
- checkpointer.c

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`‎src/backend/postmaster/checkpointer.c`

Lines changed: 5 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -708,6 +708,11 @@ CheckpointWriteDelay(int flags, double progress)`
`708`	`708`
`709`	`709`	`CheckArchiveTimeout();`
`710`	`710`
	`711`	`+/*`
	`712`	`+ * Report interim activity statistics to the stats collector.`
	`713`	`+ */`
	`714`	`+pgstat_send_bgwriter();`
	`715`	`+`
`711`	`716`	`/*`
`712`	`717`	`* This sleep used to be connected to bgwriter_delay, typically 200ms.`
`713`	`718`	`* That resulted in more frequent wakeups if not much work to do.`

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Commit1ec6a2b

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`‎src/backend/postmaster/checkpointer.c`

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