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Commitef1c807

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committed
pg_buffercache needs to be taught about relation forks, as Greg Stark
pointed out.
1 parent4ed300b commitef1c807

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3 files changed

+25
-11
lines changed

3 files changed

+25
-11
lines changed

‎contrib/pg_buffercache/pg_buffercache.sql.in‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
/* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache.sql.in,v 1.7 2007/11/13 04:24:28 momjian Exp $ */
1+
/* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache.sql.in,v 1.8 2008/08/14 12:56:41 heikki Exp $ */
22

33
-- Adjust this setting to control where the objects get created.
44
SET search_path = public;
@@ -13,7 +13,7 @@ LANGUAGE C;
1313
CREATE VIEW pg_buffercache AS
1414
SELECT P.* FROM pg_buffercache_pages() AS P
1515
(bufferid integer, relfilenode oid, reltablespace oid, reldatabase oid,
16-
relblocknumber int8, isdirty bool, usagecount int2);
16+
relforknumber int2, relblocknumber int8, isdirty bool, usagecount int2);
1717

1818
-- Don't want these to be available at public.
1919
REVOKE ALL ON FUNCTION pg_buffercache_pages() FROM PUBLIC;

‎contrib/pg_buffercache/pg_buffercache_pages.c‎

Lines changed: 15 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
* pg_buffercache_pages.c
44
* display some contents of the buffer cache
55
*
6-
* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache_pages.c,v 1.14 2007/11/15 21:14:30 momjian Exp $
6+
* $PostgreSQL: pgsql/contrib/pg_buffercache/pg_buffercache_pages.c,v 1.15 2008/08/14 12:56:41 heikki Exp $
77
*-------------------------------------------------------------------------
88
*/
99
#include"postgres.h"
@@ -16,7 +16,7 @@
1616
#include"utils/relcache.h"
1717

1818

19-
#defineNUM_BUFFERCACHE_PAGES_ELEM7
19+
#defineNUM_BUFFERCACHE_PAGES_ELEM8
2020

2121
PG_MODULE_MAGIC;
2222

@@ -32,6 +32,7 @@ typedef struct
3232
Oidrelfilenode;
3333
Oidreltablespace;
3434
Oidreldatabase;
35+
ForkNumberforknum;
3536
BlockNumberblocknum;
3637
boolisvalid;
3738
boolisdirty;
@@ -88,11 +89,13 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
8889
OIDOID,-1,0);
8990
TupleDescInitEntry(tupledesc, (AttrNumber)4,"reldatabase",
9091
OIDOID,-1,0);
91-
TupleDescInitEntry(tupledesc, (AttrNumber)5,"relblocknumber",
92+
TupleDescInitEntry(tupledesc, (AttrNumber)5,"relforknumber",
93+
INT2OID,-1,0);
94+
TupleDescInitEntry(tupledesc, (AttrNumber)6,"relblocknumber",
9295
INT8OID,-1,0);
93-
TupleDescInitEntry(tupledesc, (AttrNumber)6,"isdirty",
96+
TupleDescInitEntry(tupledesc, (AttrNumber)7,"isdirty",
9497
BOOLOID,-1,0);
95-
TupleDescInitEntry(tupledesc, (AttrNumber)7,"usage_count",
98+
TupleDescInitEntry(tupledesc, (AttrNumber)8,"usage_count",
9699
INT2OID,-1,0);
97100

98101
fctx->tupdesc=BlessTupleDesc(tupledesc);
@@ -129,6 +132,7 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
129132
fctx->record[i].relfilenode=bufHdr->tag.rnode.relNode;
130133
fctx->record[i].reltablespace=bufHdr->tag.rnode.spcNode;
131134
fctx->record[i].reldatabase=bufHdr->tag.rnode.dbNode;
135+
fctx->record[i].forknum=bufHdr->tag.forkNum;
132136
fctx->record[i].blocknum=bufHdr->tag.blockNum;
133137
fctx->record[i].usagecount=bufHdr->usage_count;
134138

@@ -184,6 +188,7 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
184188
nulls[4]= true;
185189
nulls[5]= true;
186190
nulls[6]= true;
191+
nulls[7]= true;
187192
}
188193
else
189194
{
@@ -193,12 +198,14 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
193198
nulls[2]= false;
194199
values[3]=ObjectIdGetDatum(fctx->record[i].reldatabase);
195200
nulls[3]= false;
196-
values[4]=Int64GetDatum((int64)fctx->record[i].blocknum);
201+
values[4]=ObjectIdGetDatum(fctx->record[i].forknum);
197202
nulls[4]= false;
198-
values[5]=BoolGetDatum(fctx->record[i].isdirty);
203+
values[5]=Int64GetDatum((int64)fctx->record[i].blocknum);
199204
nulls[5]= false;
200-
values[6]=Int16GetDatum(fctx->record[i].usagecount);
205+
values[6]=BoolGetDatum(fctx->record[i].isdirty);
201206
nulls[6]= false;
207+
values[7]=Int16GetDatum(fctx->record[i].usagecount);
208+
nulls[7]= false;
202209
}
203210

204211
/* Build and return the tuple. */

‎doc/src/sgml/pgbuffercache.sgml‎

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/pgbuffercache.sgml,v 2.2 2007/12/10 05:32:51 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/pgbuffercache.sgml,v 2.3 2008/08/14 12:56:41 heikki Exp $ -->
22

33
<sect1 id="pgbuffercache">
44
<title>pg_buffercache</title>
@@ -80,6 +80,13 @@
8080
<entry>Page number within the relation</entry>
8181
</row>
8282

83+
<row>
84+
<entry><structfield>relforknumber</structfield></entry>
85+
<entry><type>smallint</type></entry>
86+
<entry></entry>
87+
<entry>Fork number within the relation</entry>
88+
</row>
89+
8390
<row>
8491
<entry><structfield>isdirty</structfield></entry>
8592
<entry><type>boolean</type></entry>

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