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Add the usage count statistics to the information available in

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contrib/pgbuffercache.

Greg Smith
This commit is contained in:
Bruce Momjian
2007-04-07 16:09:14 +00:00
parent 5695f38f74
commit b0194ab110
3 changed files with 23 additions and 14 deletions
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11
contrib/pg_buffercache/pg_buffercache_pages.c
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@ -3,7 +3,7 @@
* pg_buffercache_pages.c
* display some contents of the buffer cache
*
* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache_pages.c,v 1.11 2006/10/22 17:49:21 tgl Exp $
* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache_pages.c,v 1.12 2007/04/07 16:09:14 momjian Exp $
*-------------------------------------------------------------------------
*/
#include "postgres.h"
@ -16,7 +16,7 @@
#include "utils/relcache.h"
#define NUM_BUFFERCACHE_PAGES_ELEM 6
#define NUM_BUFFERCACHE_PAGES_ELEM 7
PG_MODULE_MAGIC;
@ -35,6 +35,7 @@ typedef struct
BlockNumber blocknum;
bool isvalid;
bool isdirty;
uint16 usagecount;
} BufferCachePagesRec;
@ -91,6 +92,8 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
INT8OID, -1, 0);
TupleDescInitEntry(tupledesc, (AttrNumber) 6, "isdirty",
BOOLOID, -1, 0);
TupleDescInitEntry(tupledesc, (AttrNumber) 7, "usage_count",
INT2OID, -1, 0);
fctx->tupdesc = BlessTupleDesc(tupledesc);
@ -126,6 +129,7 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
fctx->record[i].blocknum = bufHdr->tag.blockNum;
fctx->record[i].usagecount = bufHdr->usage_count;
if (bufHdr->flags & BM_DIRTY)
fctx->record[i].isdirty = true;
@ -172,6 +176,7 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
nulls[3] = true;
nulls[4] = true;
nulls[5] = true;
nulls[6] = true;
}
else
{
@ -185,6 +190,8 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
nulls[4] = false;
values[5] = BoolGetDatum(fctx->record[i].isdirty);
nulls[5] = false;
values[6] = Int16GetDatum(fctx->record[i].usagecount);
nulls[6] = false;
}
/* Build and return the tuple. */