add system_info(ets_limit)

Add system_info(ets_limit) to provide a way to retrieve the runtime's
maximum number of ETS tables. Add tests and documentation for it too.

Also repair the alphabetical order of system_info/1 argument descriptions
in the documentation and in the erlang.erl clauses. Add new preloaded
erlang.erl due to that change. Also ensure all system_info/1 clauses are
represented in the erlang.xml source documentation -- a couple had been
inadvertently dropped in previous commits when other clauses were added.

3 files changed, 12 insertions, 0 deletions

diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index 673dfc658c..3b25efd9af 100755
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -2636,6 +2636,9 @@ BIF_RETTYPE system_info_1(BIF_ALIST_1)
 
 	BIF_RET(res);
     }
+    else if (ERTS_IS_ATOM_STR("ets_limit",BIF_ARG_1)) {
+        BIF_RET(make_small(erts_db_get_max_tabs()));
+    }
 
     BIF_ERROR(BIF_P, BADARG);
 }
diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c
index 98c2988323..40b8eaf8fb 100644
--- a/erts/emulator/beam/erl_db.c
+++ b/erts/emulator/beam/erl_db.c
@@ -3811,6 +3811,13 @@ erts_db_foreach_offheap(DbTable *tb,
     tb->common.meth->db_foreach_offheap(tb, func, arg);
 }
 
+/* retrieve max number of ets tables */
+Uint
+erts_db_get_max_tabs()
+{
+    return db_max_tabs;
+}
+
 /*
  * For testing of meta tables only.
  *
diff --git a/erts/emulator/beam/erl_db.h b/erts/emulator/beam/erl_db.h
index 6b62e10eb7..5b4681fc90 100644
--- a/erts/emulator/beam/erl_db.h
+++ b/erts/emulator/beam/erl_db.h
@@ -79,6 +79,8 @@ extern erts_smp_atomic_t erts_ets_misc_mem_size;
 
 Eterm erts_ets_colliding_names(Process*, Eterm name, Uint cnt);
 
+Uint erts_db_get_max_tabs(void);
+
 #endif
 
 #if defined(ERTS_WANT_DB_INTERNAL__) && !defined(ERTS_HAVE_DB_INTERNAL__)