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_2_9~99
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6a63dda4c2a0bf06b8da28d15baae1a08e2e8fd5;p=thirdparty%2Fpostgresql.git

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 9b0283fa518..c60158d675f 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -2474,6 +2474,7 @@ SetBufferCommitInfoNeedsSave(Buffer buffer)
 		{
 			/* Do vacuum cost accounting */
 			VacuumPageDirty++;
+			pgBufferUsage.shared_blks_dirtied++;
 			if (VacuumCostActive)
 				VacuumCostBalance += VacuumCostPageDirty;
 		}