Commitef02fb1

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Report time spent in posix_fallocate() as a wait event.

When allocating DSM segments with posix_fallocate() on Linux (see commit899bd78), report this activity as a wait event exactly as we would ifwe were using file-backed DSM rather than shm_open()-backed DSM.Author: Thomas MunroDiscussion:https://postgr.es/m/CA%2BhUKGKCSh4GARZrJrQZwqs5SYp0xDMRr9Bvb%2BHQzJKvRgL6ZA%40mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -371,10 +371,12 @@ dsm_impl_posix_resize(int fd, off_t size)`
`371`	`371`	`* interrupt pending. This avoids the possibility of looping forever`
`372`	`372`	`* if another backend is repeatedly trying to interrupt us.`
`373`	`373`	`*/`
	`374`	`+pgstat_report_wait_start(WAIT_EVENT_DSM_FILL_ZERO_WRITE);`
`374`	`375`	`do`
`375`	`376`	`{`
`376`	`377`	`rc=posix_fallocate(fd,0,size);`
`377`	`378`	`}while (rc==EINTR&& !(ProcDiePending\|\|QueryCancelPending));`
	`379`	`+pgstat_report_wait_end();`
`378`	`380`
`379`	`381`	`/*`
`380`	`382`	`* The caller expects errno to be set, but posix_fallocate() doesn't`

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