From 5a00790518773385e681e6430a4f85245fae957d Mon Sep 17 00:00:00 2001 From: Justus Winter <4winter@informatik.uni-hamburg.de> Date: Wed, 18 Mar 2015 12:25:26 +0100 Subject: ipc: replace reverse hash table with a radix tree Currently, there is a hash table mapping (space, object) tuples to `ipc_entry' objects. This hash table is intertwined with the IPC tables. There is one hash table per IPC space, but it is only for the entries in the IPC table. This hash table is called `local' in the source. All IPC entries being spilled into the splay tree are instead mapped by a global hash table. Replace the local (i.e. per IPC space) reverse hash table with a radix tree. * ipc/ipc_entry.c (ipc_entry_grow_table): Adjust accordingly. * ipc/ipc_entry.h (struct ipc_entry): Adjust comment. * ipc/ipc_hash.c: Adjust comment explaining the local lookup table. (IPC_LOCAL_HASH_INVARIANT): New macro. (ipc_hash_local_lookup): Use the new `ipc_reverse_lookup' function. (ipc_hash_local_insert): Use the new `ipc_reverse_insert' function. (ipc_hash_local_delete): Use the new `ipc_reverse_remove' function. * ipc/ipc_space.c (ipc_space_create): Initialize radix tree. (ipc_space_destroy): Free radix tree. * ipc/ipc_space.h (struct ipc_space): Add radix tree. (ipc_reverse_insert): New function. (ipc_reverse_remove): Likewise. (ipc_reverse_remove_all): Likewise. (ipc_reverse_lookup): Likewise. * ipc/ipc_right.c (ipc_right_clean): Update comment. --- ipc/ipc_space.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'ipc/ipc_space.c') diff --git a/ipc/ipc_space.c b/ipc/ipc_space.c index ab55e838..dcc96b34 100644 --- a/ipc/ipc_space.c +++ b/ipc/ipc_space.c @@ -148,6 +148,7 @@ ipc_space_create( space->is_tree_total = 0; space->is_tree_small = 0; space->is_tree_hash = 0; + rdxtree_init(&space->is_reverse_map); *spacep = space; return KERN_SUCCESS; @@ -271,6 +272,8 @@ ipc_space_destroy( } ipc_splay_traverse_finish(&space->is_tree); + rdxtree_remove_all(&space->is_reverse_map); + /* * Because the space is now dead, * we must release the "active" reference for it. -- cgit v1.2.3