Allow ShowBufferUsage() to report the number of reads/writes that have

occurred to temporary files.  This replaces the unused
NDirectFileRead/NDirectFileWrite counters.

Itagaki Takahiro

Author: tglsfdc

src/backend/storage/buffer/buf_init.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.80 2008/01/01 19:45:51 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.81 2008/09/17 13:15:55 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -29,6 +29,8 @@ long int	BufferHitCount;
 long int	LocalBufferHitCount;
 long int	BufferFlushCount;
 long int	LocalBufferFlushCount;
+long int	BufFileReadCount;
+long int	BufFileWriteCount;
 
 
 /*

src/backend/storage/buffer/bufmgr.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.237 2008/08/11 11:05:11 heikki Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.238 2008/09/17 13:15:55 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -64,12 +64,6 @@ bool		zero_damaged_pages = false;
 int			bgwriter_lru_maxpages = 100;
 double		bgwriter_lru_multiplier = 2.0;
 
-
-long		NDirectFileRead;	/* some I/O's are direct file access. bypass
-								 * bufmgr */
-long		NDirectFileWrite;	/* e.g., I/O in psort and hashjoin. */
-
-
 /* local state for StartBufferIO and related functions */
 static volatile BufferDesc *InProgressBuf = NULL;
 static bool IsForInput;
@@ -1572,7 +1566,7 @@ ShowBufferUsage(void)
 					 ReadLocalBufferCount - LocalBufferHitCount, LocalBufferFlushCount, localhitrate);
 	appendStringInfo(&str,
 					 "!\tDirect blocks: %10ld read, %10ld written\n",
-					 NDirectFileRead, NDirectFileWrite);
+					 BufFileReadCount, BufFileWriteCount);
 
 	return str.data;
 }
@@ -1586,8 +1580,8 @@ ResetBufferUsage(void)
 	LocalBufferHitCount = 0;
 	ReadLocalBufferCount = 0;
 	LocalBufferFlushCount = 0;
-	NDirectFileRead = 0;
-	NDirectFileWrite = 0;
+	BufFileReadCount = 0;
+	BufFileWriteCount = 0;
 }
 
 /*

src/backend/storage/file/buffile.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.31 2008/05/02 01:08:27 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.32 2008/09/17 13:15:55 tgl Exp $
  *
  * NOTES:
  *
@@ -36,6 +36,7 @@
 
 #include "storage/fd.h"
 #include "storage/buffile.h"
+#include "storage/buf_internals.h"
 
 /*
  * We break BufFiles into gigabyte-sized segments, regardless of RELSEG_SIZE.
@@ -238,6 +239,8 @@ BufFileLoadBuffer(BufFile *file)
 		file->nbytes = 0;
 	file->offsets[file->curFile] += file->nbytes;
 	/* we choose not to advance curOffset here */
+
+	BufFileReadCount++;
 }
 
 /*
@@ -300,6 +303,8 @@ BufFileDumpBuffer(BufFile *file)
 		file->offsets[file->curFile] += bytestowrite;
 		file->curOffset += bytestowrite;
 		wpos += bytestowrite;
+
+		BufFileWriteCount++;
 	}
 	file->dirty = false;
 

src/include/executor/execdebug.h

@@ -10,7 +10,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/executor/execdebug.h,v 1.32 2008/01/01 19:45:57 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/executor/execdebug.h,v 1.33 2008/09/17 13:15:55 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -190,19 +190,4 @@ extern int	NIndexTupleInserted;
 #define MJ_DEBUG_PROC_NODE(slot)
 #endif   /* EXEC_MERGEJOINDEBUG */
 
-/* ----------------------------------------------------------------
- *		DO NOT DEFINE THESE EVER OR YOU WILL BURN!
- * ----------------------------------------------------------------
- */
-/* ----------------
- *		NOTYET is placed around any code not yet implemented
- *		in the executor.  Only remove these when actually implementing
- *		said code.
- * ----------------
- */
-#undef NOTYET
-
-extern long NDirectFileRead;
-extern long NDirectFileWrite;
-
 #endif   /* ExecDebugIncluded */

src/include/storage/buf_internals.h

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.98 2008/08/11 11:05:11 heikki Exp $
+ * $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.99 2008/09/17 13:15:55 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -180,6 +180,8 @@ extern long int BufferHitCount;
 extern long int LocalBufferHitCount;
 extern long int BufferFlushCount;
 extern long int LocalBufferFlushCount;
+extern long int BufFileReadCount;
+extern long int BufFileWriteCount;
 
 
 /*