Remove no-longer-used XLogCacheByte field of XLogCtl.

Itagaki Takahiro

src/backend/access/transam/xlog.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.293 2008/02/17 02:09:27 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.294 2008/03/10 02:13:22 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -299,7 +299,6 @@ typedef struct XLogCtlData
 	 */
 	char	   *pages;			/* buffers for unwritten XLOG pages */
 	XLogRecPtr *xlblocks;		/* 1st byte ptr-s + XLOG_BLCKSZ */
-	Size		XLogCacheByte;	/* # bytes in xlog buffers */
 	int			XLogCacheBlck;	/* highest allocated xlog buffer index */
 	TimeLineID	ThisTimeLineID;
 
@@ -4152,8 +4151,6 @@ XLOGShmemInit(void)
 	 * Do basic initialization of XLogCtl shared data. (StartupXLOG will fill
 	 * in additional info.)
 	 */
-	XLogCtl->XLogCacheByte = (Size) XLOG_BLCKSZ *XLOGbuffers;
-
 	XLogCtl->XLogCacheBlck = XLOGbuffers - 1;
 	XLogCtl->Insert.currpage = (XLogPageHeader) (XLogCtl->pages);
 	SpinLockInit(&XLogCtl->info_lck);