diff options
Diffstat (limited to 'src/backend/storage/buffer/buf_init.c')
| -rw-r--r-- | src/backend/storage/buffer/buf_init.c | 39 |
1 files changed, 3 insertions, 36 deletions
diff --git a/src/backend/storage/buffer/buf_init.c b/src/backend/storage/buffer/buf_init.c index e03394c08bc..ff6c713b4f6 100644 --- a/src/backend/storage/buffer/buf_init.c +++ b/src/backend/storage/buffer/buf_init.c @@ -20,7 +20,6 @@ BufferDesc *BufferDescriptors; char *BufferBlocks; -int32 *PrivateRefCount; /* @@ -50,16 +49,9 @@ int32 *PrivateRefCount; * * refcount -- Counts the number of processes holding pins on a buffer. * A buffer is pinned during IO and immediately after a BufferAlloc(). - * Pins must be released before end of transaction. - * - * PrivateRefCount -- Each buffer also has a private refcount that keeps - * track of the number of times the buffer is pinned in the current - * process. This is used for two purposes: first, if we pin a - * a buffer more than once, we only need to change the shared refcount - * once, thus only lock the shared state once; second, when a transaction - * aborts, it should only unpin the buffers exactly the number of times it - * has pinned them, so that it will not blow away buffers of another - * backend. + * Pins must be released before end of transaction. For efficiency the + * shared refcount isn't increased if a individual backend pins a buffer + * multiple times. Check the PrivateRefCount infrastructure in bufmgr.c. */ @@ -130,31 +122,6 @@ InitBufferPool(void) } /* - * Initialize access to shared buffer pool - * - * This is called during backend startup (whether standalone or under the - * postmaster). It sets up for this backend's access to the already-existing - * buffer pool. - * - * NB: this is called before InitProcess(), so we do not have a PGPROC and - * cannot do LWLockAcquire; hence we can't actually access stuff in - * shared memory yet. We are only initializing local data here. - * (See also InitBufferPoolBackend, over in bufmgr.c.) - */ -void -InitBufferPoolAccess(void) -{ - /* - * Allocate and zero local arrays of per-buffer info. - */ - PrivateRefCount = (int32 *) calloc(NBuffers, sizeof(int32)); - if (!PrivateRefCount) - ereport(FATAL, - (errcode(ERRCODE_OUT_OF_MEMORY), - errmsg("out of memory"))); -} - -/* * BufferShmemSize * * compute the size of shared memory for the buffer pool including |