--- v12-0001-Add-statistics-related-to-write-sync-wal-records.patch	2021-03-03 20:22:47.258763274 +0900
+++ v13-0001-Add-statistics-related-to-write-sync-wal-records.patch	2021-03-04 16:12:06.702717779 +0900
@@ -1,4 +1,4 @@
-From d870cfa78e501097cc56780ebb3140db6b9261e5 Mon Sep 17 00:00:00 2001
+From f2353a6226ca900d1689829824d0070bbf02f42b Mon Sep 17 00:00:00 2001
 From: Masahiro Ikeda <ikedamsh@oss.nttdata.com>
 Date: Fri, 12 Feb 2021 11:19:59 +0900
 Subject: [PATCH 1/2] Add statistics related to write/sync wal records.
@@ -33,7 +33,7 @@
  src/backend/access/transam/xlog.c             | 59 +++++++++++++++++--
  src/backend/catalog/system_views.sql          |  4 ++
  src/backend/postmaster/pgstat.c               |  4 ++
- src/backend/postmaster/walwriter.c            | 21 +++++++
+ src/backend/postmaster/walwriter.c            | 20 +++++++
  src/backend/utils/adt/pgstatfuncs.c           | 24 +++++++-
  src/backend/utils/misc/guc.c                  |  9 +++
  src/backend/utils/misc/postgresql.conf.sample |  1 +
@@ -41,7 +41,7 @@
  src/include/catalog/pg_proc.dat               |  6 +-
  src/include/pgstat.h                          | 10 ++++
  src/test/regress/expected/rules.out           |  6 +-
- 14 files changed, 221 insertions(+), 15 deletions(-)
+ 14 files changed, 220 insertions(+), 15 deletions(-)
 
 diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
 index b5718fc136..c232f537b2 100644
@@ -320,7 +320,7 @@
  
  /* ----------
 diff --git a/src/backend/postmaster/walwriter.c b/src/backend/postmaster/walwriter.c
-index 4f1a8e356b..8491e6f6d6 100644
+index 4f1a8e356b..95cad4a9ac 100644
 --- a/src/backend/postmaster/walwriter.c
 +++ b/src/backend/postmaster/walwriter.c
 @@ -78,6 +78,11 @@ int			WalWriterFlushAfter = 128;
@@ -335,7 +335,7 @@
  /*
   * Main entry point for walwriter process
   *
-@@ -222,7 +227,12 @@ WalWriterMain(void)
+@@ -222,7 +227,11 @@ WalWriterMain(void)
  	 */
  	for (;;)
  	{
@@ -343,12 +343,11 @@
 +		static TimestampTz last_report = 0;
 +
  		long		cur_timeout;
-+		int			rc;
 +		TimestampTz now;
  
  		/*
  		 * Advertise whether we might hibernate in this cycle.  We do this
-@@ -253,6 +263,17 @@ WalWriterMain(void)
+@@ -253,6 +262,17 @@ WalWriterMain(void)
  		else if (left_till_hibernate > 0)
  			left_till_hibernate--;