From: Robert Haas <rhaas@postgresql.org>
Date: Mon, 31 Mar 2014 17:06:26 +0000 (-0400)
Subject: Count buffers dirtied due to hints in pgBufferUsage.shared_blks_dirtied.
X-Git-Tag: REL9_3_5~130
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ac2063ade566deb03e72e3da52cf472e125708b7;p=postgresql

Count buffers dirtied due to hints in pgBufferUsage.shared_blks_dirtied.

Previously, such buffers weren't counted, with the possible result that
EXPLAIN (BUFFERS) and pg_stat_statements would understate the true
number of blocks dirtied by an SQL statement.

Back-patch to 9.2, where this counter was introduced.

Amit Kapila
---

diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index a5e97c761d..f2f42659c1 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -2708,6 +2708,7 @@ MarkBufferDirtyHint(Buffer buffer, bool buffer_std)
 		if (dirtied)
 		{
 			VacuumPageDirty++;
+			pgBufferUsage.shared_blks_dirtied++;
 			if (VacuumCostActive)
 				VacuumCostBalance += VacuumCostPageDirty;
 		}