diff options
| -rw-r--r-- | src/backend/storage/lmgr/spin.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/backend/storage/lmgr/spin.c b/src/backend/storage/lmgr/spin.c index 8dd1c6b8a8f..3d7a8f36a9c 100644 --- a/src/backend/storage/lmgr/spin.c +++ b/src/backend/storage/lmgr/spin.c @@ -23,6 +23,7 @@ #include "postgres.h" #include "miscadmin.h" +#include "replication/walsender.h" #include "storage/lwlock.h" #include "storage/spin.h" @@ -50,14 +51,21 @@ SpinlockSemas(void) int SpinlockSemas(void) { + int nsemas; + /* * It would be cleaner to distribute this logic into the affected modules, * similar to the way shmem space estimation is handled. * - * For now, though, we just need a few spinlocks (10 should be plenty) - * plus one for each LWLock and one for each buffer header. + * For now, though, there are few enough users of spinlocks that we just + * keep the knowledge here. */ - return NumLWLocks() + NBuffers + 10; + nsemas = NumLWLocks(); /* one for each lwlock */ + nsemas += NBuffers; /* one for each buffer header */ + nsemas += max_wal_senders; /* one for each wal sender process */ + nsemas += 30; /* plus a bunch for other small-scale use */ + + return nsemas; } /* |