Merge branch 'bjorn/optimize-start-up/OTP-13368'

* bjorn/optimize-start-up/OTP-13368:
  Update preloaded modules
  init: Load modules in parallel using the new loader BIFs
  systools_make: Add commonly used modules to mandatory_modules/0
  compile: Pre-load compiler modules when invoked from 'erlc'

1 files changed, 30 insertions, 9 deletions

diff --git a/lib/sasl/src/systools_make.erl b/lib/sasl/src/systools_make.erl
index d207dc15bb..154374cd8c 100644
--- a/lib/sasl/src/systools_make.erl
+++ b/lib/sasl/src/systools_make.erl
@@ -1453,16 +1453,37 @@ behave([H|T]) ->
 behave([]) ->
     [].
 
-%%______________________________________________________________________
-%% mandatory modules; this modules must be loaded before processes
-%% can be started. These are a collection of modules from the kernel
-%% and stdlib applications.
-%% Nowadays, error_handler dynamically loads almost every module.
-%% The error_handler self must still be there though.
-
 mandatory_modules() ->
-    %% Sorted
-    [error_handler].
+    [error_handler,				%Truly mandatory.
+
+     %% Modules that are almost always needed. Listing them here
+     %% helps the init module to load them faster. Modules not
+     %% listed here will be loaded by the error_handler module.
+     %%
+     %% Keep this list sorted.
+     application,
+     application_controller,
+     application_master,
+     code,
+     code_server,
+     erl_eval,
+     erl_lint,
+     erl_parse,
+     error_logger,
+     ets,
+     file,
+     filename,
+     file_server,
+     file_io_server,
+     gen,
+     gen_event,
+     gen_server,
+     heart,
+     kernel,
+     lists,
+     proc_lib,
+     supervisor
+    ].
 
 %%______________________________________________________________________
 %% This is the modules that are preloaded into the Erlang system.