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authorJustus Winter <4winter@informatik.uni-hamburg.de>2015-03-20 00:21:14 +0100
committerJustus Winter <4winter@informatik.uni-hamburg.de>2015-05-20 11:08:29 +0200
commit77b3b60aaee2382142dc7ed50e5b36664cdb21bc (patch)
tree6e33e9f73b14110cccd24d71e28f61518c91d093 /ipc/port.h
parent5a00790518773385e681e6430a4f85245fae957d (diff)
ipc: replace the IPC table with a radix tree
Currently, the port names are mapped to an IPC object (e.g. a port) using a table. This, however, requires large chunks of continuous memory, and leads to scalability problems as virtual kernel memory is a scarce resource. To avoid excessive overhead, non-contiguous port names are spilled into a splay tree. Replace the IPC table with a radix tree. As the radix tree is able to store non-contiguous names with reasonable overhead, we can drop the splay tree as well. * ipc/ipc_entry.c (ipc_entry_tree_collision): Remove function. (ipc_entry_cache): New variable. (ipc_entry_lookup): Replace with a radix tree lookup. (ipc_entry_get): The free list handling is changed a little. Adopt accordingly. (ipc_entry_free_name): New function. (ipc_entry_alloc): Adopt accordingly. (ipc_entry_alloc_name): Likewise. (ipc_entry_dealloc): Likewise. (ipc_entry_grow_table): Remove function. * ipc/ipc_entry.h (struct ipc_entry): Update comment, add field for name and free list, remove unused fields. (ipc_entry_cache, ie_alloc, ie_free): New declarations. (struct ipc_tree_entry): Remove. Also remove any related declarations. (ipc_entry_grow_table): Remove declaration. * ipc/ipc_init.c (ipc_bootstrap): Adopt initialization. * ipc/ipc_kmsg.c (ipc_kmsg_copyout_header): Use `ipc_entry_alloc' instead of re-coding it. Adopt free list handling. (ipc_kmsg_copyout_object): Adopt free list handling, store the name. * ipc/ipc_object.c (ipc_object_copyout): Likewise. (ipc_object_copyout_multiname): Likewise. * ipc/ipc_space.c (ipc_space_create): Initialize radix tree and free list. Drop table and splay tree initialization. (ipc_space_destroy): Free ipc entries and radix tree, remove table and splay tree cleanup. * ipc/ipc_space.h (struct ipc_space): Add radix tree, free list, and size. Remove all fields related to the table and splay tree. * ddb/db_print.c (db_port_iterate): Adopt iteration. (db_lookup_port): Adopt lookup. * include/mach_debug/ipc_info.h: Remove unused parts of the debug interface. * include/mach_debug/mach_debug.defs: Likewise. * include/mach_debug/mach_debug_types.defs: Likewise. * ipc/mach_debug.c: Likewise. * ipc/ipc_right.c (ipc_right_reverse): Adopt lookup, store name. (ipc_right_check): Adopt removal. (ipc_right_destroy): Likewise. (ipc_right_dealloc): Likewise. (ipc_right_delta): Likewise. (ipc_right_copyin): Adopt insertion, adopt removal. (ipc_right_copyin_two): Adopt removal. (ipc_right_copyout): Adopt insertion, adopt removal. (ipc_right_rename): Likewise, also update comment. * ipc/mach_port.c (mach_port_names): Adopt iteration. (mach_port_get_set_status): Likewise. * ipc/port.h: Update comment. * ipc/ipc_hash.c: Delete file. * ipc/ipc_hash.h: Likewise. * ipc/ipc_splay.c: Likewise. * ipc/ipc_splay.h: Likewise. * Makefrag.am (libkernel_a_SOURCES): Remove these files.
Diffstat (limited to 'ipc/port.h')
-rw-r--r--ipc/port.h5
1 files changed, 1 insertions, 4 deletions
diff --git a/ipc/port.h b/ipc/port.h
index d359115..49af6e2 100644
--- a/ipc/port.h
+++ b/ipc/port.h
@@ -45,10 +45,7 @@
* mach_port_t must be an unsigned type. Port values
* have two parts, a generation number and an index.
* These macros encapsulate all knowledge of how
- * a mach_port_t is laid out. However, ipc/ipc_entry.c
- * implicitly assumes when it uses the splay tree functions
- * that the generation number is in the low bits, so that
- * names are ordered first by index and then by generation.
+ * a mach_port_t is laid out.
*
* If the size of generation numbers changes,
* be sure to update IE_BITS_GEN_MASK and friends