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Commit6b86d62

Browse files
Jan WieckJan Wieck
Jan Wieck
authored and
Jan Wieck
committed
2nd try for the ARC strategy.
I added a couple more Assertions while tracking down the exactcause of the former bug.All 93 regression tests pass now.Jan
1 parent923e994 commit6b86d62

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9 files changed

+958
-216
lines changed

9 files changed

+958
-216
lines changed

‎src/backend/commands/vacuum.c

Lines changed: 21 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@
1313
*
1414
*
1515
* IDENTIFICATION
16-
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.267 2003/11/1305:34:57 wieck Exp $
16+
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.268 2003/11/1314:57:15 wieck Exp $
1717
*
1818
*-------------------------------------------------------------------------
1919
*/
@@ -33,6 +33,7 @@
3333
#include"commands/vacuum.h"
3434
#include"executor/executor.h"
3535
#include"miscadmin.h"
36+
#include"storage/buf_internals.h"
3637
#include"storage/freespace.h"
3738
#include"storage/sinval.h"
3839
#include"storage/smgr.h"
@@ -310,8 +311,16 @@ vacuum(VacuumStmt *vacstmt)
310311
else
311312
old_context=MemoryContextSwitchTo(anl_context);
312313

314+
/*
315+
* Tell the buffer replacement strategy that vacuum is
316+
* causing the IO
317+
*/
318+
StrategyHintVacuum(true);
319+
313320
analyze_rel(relid,vacstmt);
314321

322+
StrategyHintVacuum(false);
323+
315324
if (vacstmt->vacuum)
316325
CommitTransactionCommand();
317326
else
@@ -749,6 +758,12 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
749758
SetQuerySnapshot();/* might be needed for functions in
750759
* indexes */
751760

761+
/*
762+
* Tell the cache replacement strategy that vacuum is causing
763+
* all following IO
764+
*/
765+
StrategyHintVacuum(true);
766+
752767
/*
753768
* Check for user-requested abort.Note we want this to be inside a
754769
* transaction, so xact.c doesn't issue useless WARNING.
@@ -763,6 +778,7 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
763778
ObjectIdGetDatum(relid),
764779
0,0,0))
765780
{
781+
StrategyHintVacuum(false);
766782
CommitTransactionCommand();
767783
return true;/* okay 'cause no data there */
768784
}
@@ -796,6 +812,7 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
796812
(errmsg("skipping \"%s\" --- only table or database owner can vacuum it",
797813
RelationGetRelationName(onerel))));
798814
relation_close(onerel,lmode);
815+
StrategyHintVacuum(false);
799816
CommitTransactionCommand();
800817
return false;
801818
}
@@ -810,6 +827,7 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
810827
(errmsg("skipping \"%s\" --- cannot vacuum indexes, views, or special system tables",
811828
RelationGetRelationName(onerel))));
812829
relation_close(onerel,lmode);
830+
StrategyHintVacuum(false);
813831
CommitTransactionCommand();
814832
return false;
815833
}
@@ -824,6 +842,7 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
824842
if (isOtherTempNamespace(RelationGetNamespace(onerel)))
825843
{
826844
relation_close(onerel,lmode);
845+
StrategyHintVacuum(false);
827846
CommitTransactionCommand();
828847
return true;/* assume no long-lived data in temp
829848
* tables */
@@ -863,6 +882,7 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
863882
/*
864883
* Complete the transaction and free all temporary memory used.
865884
*/
885+
StrategyHintVacuum(false);
866886
CommitTransactionCommand();
867887

868888
/*

‎src/backend/storage/buffer/buf_init.c

Lines changed: 8 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.56 2003/11/1305:34:58 wieck Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.57 2003/11/1314:57:15 wieck Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -48,9 +48,6 @@ long *CurTraceBuf;
4848
intShowPinTrace=0;
4949

5050
intData_Descriptors;
51-
intFree_List_Descriptor;
52-
intLookup_List_Descriptor;
53-
intNum_Descriptors;
5451

5552
BufferDesc*BufferDescriptors;
5653
Block*BufferBlockPointers;
@@ -133,9 +130,6 @@ InitBufferPool(void)
133130
inti;
134131

135132
Data_Descriptors=NBuffers;
136-
Free_List_Descriptor=Data_Descriptors;
137-
Lookup_List_Descriptor=Data_Descriptors+1;
138-
Num_Descriptors=Data_Descriptors+1;
139133

140134
/*
141135
* It's probably not really necessary to grab the lock --- if there's
@@ -156,7 +150,7 @@ InitBufferPool(void)
156150

157151
BufferDescriptors= (BufferDesc*)
158152
ShmemInitStruct("Buffer Descriptors",
159-
Num_Descriptors*sizeof(BufferDesc),&foundDescs);
153+
Data_Descriptors*sizeof(BufferDesc),&foundDescs);
160154

161155
BufferBlocks= (char*)
162156
ShmemInitStruct("Buffer Blocks",
@@ -176,16 +170,14 @@ InitBufferPool(void)
176170
block=BufferBlocks;
177171

178172
/*
179-
* link the buffers into a circular, doubly-linked list to
180-
* initialize free list, and initialize the buffer headers. Still
181-
* don't know anything about replacement strategy in this file.
173+
* link the buffers into a single linked list. This will become the
174+
* LiFo list of unused buffers returned by StragegyGetBuffer().
182175
*/
183176
for (i=0;i<Data_Descriptors;block+=BLCKSZ,buf++,i++)
184177
{
185178
Assert(ShmemIsValid((unsigned long)block));
186179

187-
buf->freeNext=i+1;
188-
buf->freePrev=i-1;
180+
buf->bufNext=i+1;
189181

190182
CLEAR_BUFFERTAG(&(buf->tag));
191183
buf->buf_id=i;
@@ -199,14 +191,12 @@ InitBufferPool(void)
199191
buf->wait_backend_id=0;
200192
}
201193

202-
/* close the circular queue */
203-
BufferDescriptors[0].freePrev=Data_Descriptors-1;
204-
BufferDescriptors[Data_Descriptors-1].freeNext=0;
194+
/* Correct last entry */
195+
BufferDescriptors[Data_Descriptors-1].bufNext=-1;
205196
}
206197

207198
/* Init other shared buffer-management stuff */
208-
InitBufTable();
209-
InitFreeList(!foundDescs);
199+
StrategyInitialize(!foundDescs);
210200

211201
LWLockRelease(BufMgrLock);
212202
}

‎src/backend/storage/buffer/buf_table.c

Lines changed: 26 additions & 42 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_table.c,v 1.31 2003/11/1305:34:58 wieck Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_table.c,v 1.32 2003/11/1314:57:15 wieck Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -38,7 +38,7 @@ static HTAB *SharedBufHash;
3838
* Initialize shmem hash table for mapping buffers
3939
*/
4040
void
41-
InitBufTable(void)
41+
InitBufTable(intsize)
4242
{
4343
HASHCTLinfo;
4444

@@ -50,87 +50,71 @@ InitBufTable(void)
5050
info.hash=tag_hash;
5151

5252
SharedBufHash=ShmemInitHash("Shared Buffer Lookup Table",
53-
NBuffers,NBuffers,
53+
size,size,
5454
&info,
5555
HASH_ELEM |HASH_FUNCTION);
5656

5757
if (!SharedBufHash)
5858
elog(FATAL,"could not initialize shared buffer hash table");
5959
}
6060

61-
BufferDesc*
61+
/*
62+
* BufTableLookup
63+
*/
64+
int
6265
BufTableLookup(BufferTag*tagPtr)
6366
{
6467
BufferLookupEnt*result;
6568

6669
if (tagPtr->blockNum==P_NEW)
67-
returnNULL;
70+
return-1;
6871

6972
result= (BufferLookupEnt*)
7073
hash_search(SharedBufHash, (void*)tagPtr,HASH_FIND,NULL);
7174
if (!result)
72-
returnNULL;
75+
return-1;
7376

74-
return&(BufferDescriptors[result->id]);
77+
returnresult->id;
7578
}
7679

7780
/*
7881
* BufTableDelete
7982
*/
8083
bool
81-
BufTableDelete(BufferDesc*buf)
84+
BufTableInsert(BufferTag*tagPtr,Bufferbuf_id)
8285
{
8386
BufferLookupEnt*result;
84-
85-
/*
86-
* buffer not initialized or has been removed from table already.
87-
* BM_DELETED keeps us from removing buffer twice.
88-
*/
89-
if (buf->flags&BM_DELETED)
90-
return TRUE;
91-
92-
buf->flags |=BM_DELETED;
87+
boolfound;
9388

9489
result= (BufferLookupEnt*)
95-
hash_search(SharedBufHash, (void*)&(buf->tag),HASH_REMOVE,NULL);
90+
hash_search(SharedBufHash, (void*)tagPtr,HASH_ENTER,&found);
9691

97-
if (!result)/* shouldn't happen */
98-
elog(ERROR,"shared buffer hash table corrupted");
92+
if (!result)
93+
ereport(ERROR,
94+
(errcode(ERRCODE_OUT_OF_MEMORY),
95+
errmsg("out of shared memory")));
9996

100-
/*
101-
* Clear the buffer's tag. This doesn't matter for the hash table,
102-
* since the buffer is already removed from it, but it ensures that
103-
* sequential searches through the buffer table won't think the buffer
104-
* is still valid for its old page.
105-
*/
106-
buf->tag.rnode.relNode=InvalidOid;
107-
buf->tag.rnode.tblNode=InvalidOid;
97+
if (found)/* found something else in the table? */
98+
elog(ERROR,"shared buffer hash table corrupted");
10899

100+
result->id=buf_id;
109101
return TRUE;
110102
}
111103

104+
/*
105+
* BufTableDelete
106+
*/
112107
bool
113-
BufTableInsert(BufferDesc*buf)
108+
BufTableDelete(BufferTag*tagPtr)
114109
{
115110
BufferLookupEnt*result;
116-
boolfound;
117-
118-
/* cannot insert it twice */
119-
Assert(buf->flags&BM_DELETED);
120-
buf->flags &= ~(BM_DELETED);
121111

122112
result= (BufferLookupEnt*)
123-
hash_search(SharedBufHash, (void*)&(buf->tag),HASH_ENTER,&found);
124-
125-
if (!result)
126-
ereport(ERROR,
127-
(errcode(ERRCODE_OUT_OF_MEMORY),
128-
errmsg("out of shared memory")));
113+
hash_search(SharedBufHash, (void*)tagPtr,HASH_REMOVE,NULL);
129114

130-
if (found)/*found something else in the table? */
115+
if (!result)/*shouldn't happen */
131116
elog(ERROR,"shared buffer hash table corrupted");
132117

133-
result->id=buf->buf_id;
134118
return TRUE;
135119
}
136120

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