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Commit51ee9fa

Browse files
committed
Add support to dynahash.c for partitioning shared hashtables according
to the low-order bits of the entry hash value. Also make some incidentalcleanups in the dynahash API, such as not exporting the hash headerstructs to the world.
1 parentc0e9b31 commit51ee9fa

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4 files changed

+387
-180
lines changed

4 files changed

+387
-180
lines changed

‎src/backend/storage/ipc/shmem.c‎

Lines changed: 7 additions & 30 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.93 2006/07/14 14:52:22 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.94 2006/07/22 23:04:39 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -211,9 +211,6 @@ InitShmemIndex(void)
211211
{
212212
HASHCTLinfo;
213213
inthash_flags;
214-
ShmemIndexEnt*result,
215-
item;
216-
boolfound;
217214

218215
/*
219216
* Since ShmemInitHash calls ShmemInitStruct, which expects the ShmemIndex
@@ -227,32 +224,11 @@ InitShmemIndex(void)
227224
info.entrysize=sizeof(ShmemIndexEnt);
228225
hash_flags=HASH_ELEM;
229226

230-
/* This will acquire the shmem index lock, but not release it. */
231227
ShmemIndex=ShmemInitHash("ShmemIndex",
232228
SHMEM_INDEX_SIZE,SHMEM_INDEX_SIZE,
233229
&info,hash_flags);
234230
if (!ShmemIndex)
235231
elog(FATAL,"could not initialize Shmem Index");
236-
237-
/*
238-
* Now, create an entry in the hashtable for the index itself.
239-
*/
240-
if (!IsUnderPostmaster)
241-
{
242-
MemSet(item.key,0,SHMEM_INDEX_KEYSIZE);
243-
strncpy(item.key,"ShmemIndex",SHMEM_INDEX_KEYSIZE);
244-
245-
result= (ShmemIndexEnt*)
246-
hash_search(ShmemIndex, (void*)&item,HASH_ENTER,&found);
247-
248-
Assert(!found);
249-
250-
result->location=MAKE_OFFSET(ShmemIndex->hctl);
251-
result->size=SHMEM_INDEX_SIZE;
252-
}
253-
254-
/* now release the lock acquired in ShmemInitStruct */
255-
LWLockRelease(ShmemIndexLock);
256232
}
257233

258234
/*
@@ -295,7 +271,7 @@ ShmemInitHash(const char *name, /* table string name for shmem index */
295271

296272
/* look it up in the shmem index */
297273
location=ShmemInitStruct(name,
298-
sizeof(HASHHDR)+infoP->dsize*sizeof(HASHSEGMENT),
274+
hash_get_shared_size(infoP,hash_flags),
299275
&found);
300276

301277
/*
@@ -312,9 +288,8 @@ ShmemInitHash(const char *name, /* table string name for shmem index */
312288
if (found)
313289
hash_flags |=HASH_ATTACH;
314290

315-
/*Now provide theheaderand directory pointers */
291+
/*Pass location of hashtableheaderto hash_create */
316292
infoP->hctl= (HASHHDR*)location;
317-
infoP->dir= (HASHSEGMENT*) (((char*)location)+sizeof(HASHHDR));
318293

319294
returnhash_create(name,init_size,infoP,hash_flags);
320295
}
@@ -363,14 +338,16 @@ ShmemInitStruct(const char *name, Size size, bool *foundPtr)
363338
* If the shmem index doesn't exist, we are bootstrapping: we must
364339
* be trying to init the shmem index itself.
365340
*
366-
* Notice that the ShmemIndexLock is held until the shmem index
367-
* has been completely initialized.
341+
* Notice that the ShmemIndexLock is released before the shmem
342+
* index has been initialized. This should be OK because no
343+
* other process can be accessing shared memory yet.
368344
*/
369345
Assert(shmemseghdr->indexoffset==0);
370346
structPtr=ShmemAlloc(size);
371347
shmemseghdr->indexoffset=MAKE_OFFSET(structPtr);
372348
*foundPtr= FALSE;
373349
}
350+
LWLockRelease(ShmemIndexLock);
374351
returnstructPtr;
375352
}
376353

‎src/backend/storage/lmgr/lock.c‎

Lines changed: 2 additions & 2 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 1.166 2006/07/14 14:52:23 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.167 2006/07/22 23:04:39 tgl Exp $
1212
*
1313
* NOTES
1414
* A lock table is a shared memory hash table. When
@@ -1958,7 +1958,7 @@ GetLockStatusData(void)
19581958
{
19591959
LWLockAcquire(FirstLockMgrLock+i,LW_SHARED);
19601960
proclockTable=LockMethodProcLockHash[i];
1961-
els+=proclockTable->hctl->nentries;
1961+
els+=hash_get_num_entries(proclockTable);
19621962
}
19631963

19641964
data->nelements=els;

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