XLogCacheByte is unused

I found XLogCtlData.XLogCacheByte is already unused in CVS HEAD.
Should we remove the variable, or reserve it for future use?

Index: src/backend/access/transam/xlog.c
===================================================================
--- src/backend/access/transam/xlog.c (revision 1268)
+++ src/backend/access/transam/xlog.c (working copy)
@@ -317,7 +317,6 @@
*/
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;

@@ -4115,8 +4114,6 @@
* 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);

Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center