From b079018e38272604ffacfece9b97924a9e39df5c Mon Sep 17 00:00:00 2001 From: Rickard Green Date: Mon, 23 Jan 2017 17:10:18 +0100 Subject: Implement magic references Magic references are *intentionally* indistinguishable from ordinary references for the Erlang software. Magic references do not change the language, and are intended as a pure runtime internal optimization. An ordinary reference is typically used as a key in some table. A magic reference has a direct pointer to a reference counted magic binary. This makes it possible to implement various things without having to do lookups in a table, but instead access the data directly. Besides very fast lookups this can also improve scalability by removing a potentially contended table. A couple of examples of planned future usage of magic references are ETS table identifiers, and BIF timer identifiers. Besides future optimizations using magic references it should also be possible to replace the exposed magic binary cludge with magic references. That is, magic binaries that are exposed as empty binaries to the Erlang software. --- erts/emulator/beam/erl_alloc.types | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'erts/emulator/beam/erl_alloc.types') diff --git a/erts/emulator/beam/erl_alloc.types b/erts/emulator/beam/erl_alloc.types index 70eca5b49c..c253ea82c8 100644 --- a/erts/emulator/beam/erl_alloc.types +++ b/erts/emulator/beam/erl_alloc.types @@ -280,6 +280,10 @@ type TRACE_MSG_QUEUE SHORT_LIVED SYSTEM trace_message_queue type SCHED_ASYNC_JOB SHORT_LIVED SYSTEM async_calls type DIRTY_START STANDARD PROCESSES dirty_start type DIRTY_SL SHORT_LIVED SYSTEM dirty_short_lived +type MREF_NSCHED_ENT FIXED_SIZE SYSTEM nsched_magic_ref_entry +type MREF_ENT STANDARD SYSTEM magic_ref_entry +type MREF_TAB_BKTS STANDARD SYSTEM magic_ref_table_buckets +type MREF_TAB LONG_LIVED SYSTEM magic_ref_table +if threads_no_smp # Need thread safe allocs, but std_alloc and fix_alloc are not; -- cgit v1.2.3