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Commit3379263

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Count locked pages that don't need vacuuming as scanned.
Previously, if VACUUM skipped vacuuming a page because it's pinned, itdidn't count that page as scanned. However, that meant that relfrozenxidwas not bumped up either, which prevented anti-wraparound vacuum fromdoing its job.Report by Миша Тюрин, analysis and patch by Sergey Burladyn and Jeff Janes.Backpatch to 9.2, where the skip-locked-pages behavior was introduced.
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‎src/backend/commands/vacuumlazy.c

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Original file line numberDiff line numberDiff line change
@@ -589,6 +589,7 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
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if (!lazy_check_needs_freeze(buf))
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{
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UnlockReleaseBuffer(buf);
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vacrelstats->scanned_pages++;
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continue;
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}
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LockBuffer(buf,BUFFER_LOCK_UNLOCK);

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