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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2011-04-11 13:43:31 +0300 |
|---|---|---|
| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2011-04-11 13:43:31 +0300 |
| commit | 7c797e7194d969f974abf579cacf30ffdccdbb95 (patch) | |
| tree | e8613658516942b58181f98615721a0c997996c2 /src/backend/utils | |
| parent | f510fc1d904d3266fd433b49664a7685f4fc89ef (diff) | |
| download | postgresql-7c797e7194d969f974abf579cacf30ffdccdbb95.tar.gz postgresql-7c797e7194d969f974abf579cacf30ffdccdbb95.zip | |
Fix the size of predicate lock manager's shared memory hash tables at creation.
This way they don't compete with the regular lock manager for the slack shared
memory, making the behavior more predictable.
Diffstat (limited to 'src/backend/utils')
| -rw-r--r-- | src/backend/utils/hash/dynahash.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/backend/utils/hash/dynahash.c b/src/backend/utils/hash/dynahash.c index f718785ee47..d9027291ee3 100644 --- a/src/backend/utils/hash/dynahash.c +++ b/src/backend/utils/hash/dynahash.c @@ -160,6 +160,7 @@ struct HTAB MemoryContext hcxt; /* memory context if default allocator used */ char *tabname; /* table name (for error messages) */ bool isshared; /* true if table is in shared memory */ + bool isfixed; /* if true, don't enlarge */ /* freezing a shared table isn't allowed, so we can keep state here */ bool frozen; /* true = no more inserts allowed */ @@ -435,6 +436,8 @@ hash_create(const char *tabname, long nelem, HASHCTL *info, int flags) errmsg("out of memory"))); } + if (flags & HASH_FIXED_SIZE) + hashp->isfixed = true; return hashp; } @@ -1334,6 +1337,9 @@ element_alloc(HTAB *hashp, int nelem) HASHELEMENT *prevElement; int i; + if (hashp->isfixed) + return false; + /* Each element has a HASHELEMENT header plus user data. */ elementSize = MAXALIGN(sizeof(HASHELEMENT)) + MAXALIGN(hctlv->entrysize); |