diff -r -u -P --exclude-from=/home/postgres/cmd/diff.excludes postgresql-9.5alpha2/src/backend/postmaster/checkpointer.c postgresql-9.5alpha2-sync_file_range/src/backend/postmaster/checkpointer.c
--- postgresql-9.5alpha2/src/backend/postmaster/checkpointer.c	2015-08-04 05:34:55.000000000 +0900
+++ postgresql-9.5alpha2-sync_file_range/src/backend/postmaster/checkpointer.c	2015-09-17 15:44:19.118766727 +0900
@@ -1385,3 +1385,11 @@
 
 	return FirstCall;
 }
+
+bool
+AmIcheckpointer(void)
+{
+	if (CheckpointerShmem)
+		return MyProcPid == CheckpointerShmem->checkpointer_pid;
+	return false;
+}
diff -r -u -P --exclude-from=/home/postgres/cmd/diff.excludes postgresql-9.5alpha2/src/backend/storage/file/fd.c postgresql-9.5alpha2-sync_file_range/src/backend/storage/file/fd.c
--- postgresql-9.5alpha2/src/backend/storage/file/fd.c	2015-08-04 05:34:55.000000000 +0900
+++ postgresql-9.5alpha2-sync_file_range/src/backend/storage/file/fd.c	2015-09-18 13:19:12.297149058 +0900
@@ -2719,3 +2719,21 @@
 
 	(void) CloseTransientFile(fd);
 }
+
+int
+FileSyncFileRange(File file, off64_t offset, off64_t nbytes)
+{
+	int			returnCode;
+
+	Assert(FileIsValid(file));
+
+	DO_DB(elog(LOG, "FileSyncFileRange: %d (%s)",
+			   file, VfdCache[file].fileName));
+
+	returnCode = FileAccess(file);
+	if (returnCode < 0)
+		return returnCode;
+
+	return sync_file_range(VfdCache[file].fd, offset, nbytes,
+						   SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
+}
diff -r -u -P --exclude-from=/home/postgres/cmd/diff.excludes postgresql-9.5alpha2/src/backend/storage/smgr/md.c postgresql-9.5alpha2-sync_file_range/src/backend/storage/smgr/md.c
--- postgresql-9.5alpha2/src/backend/storage/smgr/md.c	2015-08-04 05:34:55.000000000 +0900
+++ postgresql-9.5alpha2-sync_file_range/src/backend/storage/smgr/md.c	2015-09-18 13:19:04.281934015 +0900
@@ -795,7 +795,11 @@
 	}
 
 	if (!skipFsync && !SmgrIsTemp(reln))
+	{
 		register_dirty_segment(reln, forknum, v);
+		if (AmIcheckpointer())
+			FileSyncFileRange(v->mdfd_vfd, seekpos, BLCKSZ);
+	}
 }
 
 /*
diff -r -u -P --exclude-from=/home/postgres/cmd/diff.excludes postgresql-9.5alpha2/src/include/postmaster/bgwriter.h postgresql-9.5alpha2-sync_file_range/src/include/postmaster/bgwriter.h
--- postgresql-9.5alpha2/src/include/postmaster/bgwriter.h	2015-08-04 05:34:55.000000000 +0900
+++ postgresql-9.5alpha2-sync_file_range/src/include/postmaster/bgwriter.h	2015-09-17 09:08:33.105535928 +0900
@@ -30,6 +30,7 @@
 
 extern void RequestCheckpoint(int flags);
 extern void CheckpointWriteDelay(int flags, double progress);
+extern bool AmIcheckpointer(void);
 
 extern bool ForwardFsyncRequest(RelFileNode rnode, ForkNumber forknum,
 					BlockNumber segno);
diff -r -u -P --exclude-from=/home/postgres/cmd/diff.excludes postgresql-9.5alpha2/src/include/storage/fd.h postgresql-9.5alpha2-sync_file_range/src/include/storage/fd.h
--- postgresql-9.5alpha2/src/include/storage/fd.h	2015-08-04 05:34:55.000000000 +0900
+++ postgresql-9.5alpha2-sync_file_range/src/include/storage/fd.h	2015-09-17 20:43:57.372916888 +0900
@@ -72,6 +72,7 @@
 extern int	FileRead(File file, char *buffer, int amount);
 extern int	FileWrite(File file, char *buffer, int amount);
 extern int	FileSync(File file);
+extern int	FileSyncFileRange(File file, off64_t offset, off64_t nbytes);
 extern off_t FileSeek(File file, off_t offset, int whence);
 extern int	FileTruncate(File file, off_t offset);
 extern char *FilePathName(File file);