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Commit0fb3152

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committed
Minor adjustments to improve the accuracy of our computation of required
shared memory size.
1 parent1bb38bb commit0fb3152

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5 files changed

+44
-22
lines changed

5 files changed

+44
-22
lines changed

‎src/backend/storage/freespace/freespace.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.35 2004/09/28 20:46:27 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.36 2004/09/29 15:15:54 tgl Exp $
1212
*
1313
*
1414
* NOTES:
@@ -330,7 +330,7 @@ FreeSpaceShmemSize(void)
330330
size=MAXALIGN(sizeof(FSMHeader));
331331

332332
/* hash table, including the FSMRelation objects */
333-
size+=hash_estimate_size(MaxFSMRelations,sizeof(FSMRelation));
333+
size+=hash_estimate_size(MaxFSMRelations+1,sizeof(FSMRelation));
334334

335335
/* page-storage arena */
336336
nchunks= (MaxFSMPages-1) /CHUNKPAGES+1;

‎src/backend/storage/ipc/ipci.c‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.71 2004/08/2905:06:48 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.72 2004/09/2915:15:55 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -69,6 +69,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate,
6969
size=hash_estimate_size(SHMEM_INDEX_SIZE,sizeof(ShmemIndexEnt));
7070
size+=BufferShmemSize();
7171
size+=LockShmemSize(maxBackends);
72+
size+=ProcGlobalShmemSize(maxBackends);
7273
size+=XLOGShmemSize();
7374
size+=CLOGShmemSize();
7475
size+=SUBTRANSShmemSize();

‎src/backend/storage/lmgr/lock.c‎

Lines changed: 9 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.141 2004/09/28 20:46:32 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.142 2004/09/29 15:15:55 tgl Exp $
1212
*
1313
* NOTES
1414
* Outside modules can create a lock table and acquire/release
@@ -1689,15 +1689,17 @@ LockReassignCurrentOwner(void)
16891689
}
16901690

16911691

1692+
/*
1693+
* Estimate shared-memory space used for lock tables
1694+
*/
16921695
int
16931696
LockShmemSize(intmaxBackends)
16941697
{
16951698
intsize=0;
16961699
longmax_table_size=NLOCKENTS(maxBackends);
16971700

1698-
size+=MAXALIGN(sizeof(PROC_HDR));/* ProcGlobal */
1699-
size+=maxBackends*MAXALIGN(sizeof(PGPROC));/* each MyProc */
1700-
size+=MAX_LOCK_METHODS*MAXALIGN(sizeof(LockMethodData));/* each lock method */
1701+
/* lock method headers */
1702+
size+=MAX_LOCK_METHODS*MAXALIGN(sizeof(LockMethodData));
17011703

17021704
/* lockHash table */
17031705
size+=hash_estimate_size(max_table_size,sizeof(LOCK));
@@ -1706,6 +1708,9 @@ LockShmemSize(int maxBackends)
17061708
size+=hash_estimate_size(max_table_size,sizeof(PROCLOCK));
17071709

17081710
/*
1711+
* Note we count only one pair of hash tables, since the userlocks
1712+
* table actually overlays the main one.
1713+
*
17091714
* Since the lockHash entry count above is only an estimate, add 10%
17101715
* safety margin.
17111716
*/

‎src/backend/storage/lmgr/proc.c‎

Lines changed: 29 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.153 2004/08/2905:06:48 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.154 2004/09/2915:15:55 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -89,6 +89,22 @@ static void DummyProcKill(int code, Datum arg);
8989
staticboolCheckStatementTimeout(void);
9090

9191

92+
/*
93+
* Report shared-memory space needed by InitProcGlobal.
94+
*/
95+
int
96+
ProcGlobalShmemSize(intmaxBackends)
97+
{
98+
intsize=0;
99+
100+
size+=MAXALIGN(sizeof(PROC_HDR));/* ProcGlobal */
101+
size+=MAXALIGN(NUM_DUMMY_PROCS*sizeof(PGPROC));/* DummyProcs */
102+
size+=MAXALIGN(maxBackends*sizeof(PGPROC));/* MyProcs */
103+
size+=MAXALIGN(sizeof(slock_t));/* ProcStructLock */
104+
105+
returnsize;
106+
}
107+
92108
/*
93109
* Report number of semaphores needed by InitProcGlobal.
94110
*/
@@ -134,7 +150,7 @@ InitProcGlobal(int maxBackends)
134150
* processes, too.These do not get linked into the freeProcs list.
135151
*/
136152
DummyProcs= (PGPROC*)
137-
ShmemInitStruct("DummyProcs",sizeof(PGPROC)*NUM_DUMMY_PROCS,
153+
ShmemInitStruct("DummyProcs",NUM_DUMMY_PROCS*sizeof(PGPROC),
138154
&foundDummy);
139155

140156
if (foundProcGlobal||foundDummy)
@@ -147,6 +163,7 @@ InitProcGlobal(int maxBackends)
147163
/*
148164
* We're the first - initialize.
149165
*/
166+
PGPROC*procs;
150167
inti;
151168

152169
ProcGlobal->freeProcs=INVALID_OFFSET;
@@ -155,22 +172,20 @@ InitProcGlobal(int maxBackends)
155172
* Pre-create the PGPROC structures and create a semaphore for
156173
* each.
157174
*/
175+
procs= (PGPROC*)ShmemAlloc(maxBackends*sizeof(PGPROC));
176+
if (!procs)
177+
ereport(FATAL,
178+
(errcode(ERRCODE_OUT_OF_MEMORY),
179+
errmsg("out of shared memory")));
180+
MemSet(procs,0,maxBackends*sizeof(PGPROC));
158181
for (i=0;i<maxBackends;i++)
159182
{
160-
PGPROC*proc;
161-
162-
proc= (PGPROC*)ShmemAlloc(sizeof(PGPROC));
163-
if (!proc)
164-
ereport(FATAL,
165-
(errcode(ERRCODE_OUT_OF_MEMORY),
166-
errmsg("out of shared memory")));
167-
MemSet(proc,0,sizeof(PGPROC));
168-
PGSemaphoreCreate(&proc->sem);
169-
proc->links.next=ProcGlobal->freeProcs;
170-
ProcGlobal->freeProcs=MAKE_OFFSET(proc);
183+
PGSemaphoreCreate(&(procs[i].sem));
184+
procs[i].links.next=ProcGlobal->freeProcs;
185+
ProcGlobal->freeProcs=MAKE_OFFSET(&procs[i]);
171186
}
172187

173-
MemSet(DummyProcs,0,sizeof(PGPROC)*NUM_DUMMY_PROCS);
188+
MemSet(DummyProcs,0,NUM_DUMMY_PROCS*sizeof(PGPROC));
174189
for (i=0;i<NUM_DUMMY_PROCS;i++)
175190
{
176191
DummyProcs[i].pid=0;/* marks dummy proc as not in use */

‎src/include/storage/proc.h‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/include/storage/proc.h,v 1.75 2004/08/2905:06:58 momjian Exp $
10+
* $PostgreSQL: pgsql/src/include/storage/proc.h,v 1.76 2004/09/2915:15:56 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -122,6 +122,7 @@ extern intStatementTimeout;
122122
* Function Prototypes
123123
*/
124124
externintProcGlobalSemas(intmaxBackends);
125+
externintProcGlobalShmemSize(intmaxBackends);
125126
externvoidInitProcGlobal(intmaxBackends);
126127
externvoidInitProcess(void);
127128
externvoidInitDummyProcess(intproctype);

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