Improve binary garbage collection

The garbage collector in r13b03 is too aggressive in some cases. This
commit raises the level of default initial allowed binary garbage
(virtual heap for binaries) before collecting from 233 words to
46368 words (181 kB on 32-bit).

A new option, min_bin_vheap_size, has been added to spawn_opt,
system_flag and process_flag can be used to change the default values.

The option can also be used with system_info and process_info to
inspect the values.

For symmetry the option min_heap_size has been added to the above
functions where it was previously missing.

Add testcases for min_bin_vheap_size and min_heap_size for
functions process_flag/2, process_info/2, system_info/2 and
spawn_opt/2.

1 files changed, 40 insertions, 4 deletions

diff --git a/erts/emulator/test/process_SUITE.erl b/erts/emulator/test/process_SUITE.erl
index fdedf30e78..89603b45f4 100644
--- a/erts/emulator/test/process_SUITE.erl
+++ b/erts/emulator/test/process_SUITE.erl
@@ -41,7 +41,8 @@
 	 bump_reductions/1, low_prio/1, binary_owner/1, yield/1, yield2/1,
 	 process_status_exiting/1,
 	 otp_4725/1, bad_register/1, garbage_collect/1, otp_6237/1,
-	 process_info_messages/1, process_flag_badarg/1,
+	 process_info_messages/1, process_flag_badarg/1, process_flag_heap_size/1,
+	 spawn_opt_heap_size/1,
 	 processes_large_tab/1, processes_default_tab/1, processes_small_tab/1,
 	 processes_this_tab/1, processes_apply_trap/1,
 	 processes_last_call_trap/1, processes_gc_trap/1,
@@ -63,9 +64,8 @@ all(suite) ->
      process_info_lock_reschedule, process_info_lock_reschedule2,
      process_status_exiting,
      bump_reductions, low_prio, yield, yield2, otp_4725, bad_register,
-     garbage_collect, process_info_messages, process_flag_badarg, otp_6237,
-     processes_bif,
-     otp_7738].
+     garbage_collect, process_info_messages, process_flag_badarg, process_flag_heap_size,
+     spawn_opt_heap_size, otp_6237, processes_bif, otp_7738].
 
 init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
     Dog=?t:timetrap(?t:minutes(10)),
@@ -388,6 +388,8 @@ t_process_info(Config) when is_list(Config) ->
     ?line register(my_name, self()),
     ?line {registered_name, my_name} = process_info(self(), registered_name),
     ?line {status, running} = process_info(self(), status),
+    ?line {min_heap_size, 233} = process_info(self(), min_heap_size),
+    ?line {min_bin_vheap_size, 46368} = process_info(self(), min_bin_vheap_size),
     ?line {current_function, {?MODULE, t_process_info, 1}} =
 	process_info(self(), current_function),
     ?line Gleader = group_leader(),
@@ -437,6 +439,10 @@ process_info_other_msg(Config) when is_list(Config) ->
 	      empty -> ok
 	  end,
     ?line {messages,[]} = process_info(Pid, messages),
+
+    ?line {min_heap_size, 233} = process_info(Pid, min_heap_size),
+    ?line {min_bin_vheap_size, 46368} = process_info(Pid, min_bin_vheap_size),
+
     ?line Pid ! stop,
     ok.
 
@@ -1148,6 +1154,8 @@ process_flag_badarg(Config) when is_list(Config) ->
     ?line chk_badarg(fun () -> process_flag(trap_exit, gurka) end),
     ?line chk_badarg(fun () -> process_flag(error_handler, 1) end),
     ?line chk_badarg(fun () -> process_flag(min_heap_size, gurka) end),
+    ?line chk_badarg(fun () -> process_flag(min_bin_vheap_size, gurka) end),
+    ?line chk_badarg(fun () -> process_flag(min_bin_vheap_size, -1) end),
     ?line chk_badarg(fun () -> process_flag(priority, 4711) end),
     ?line chk_badarg(fun () -> process_flag(save_calls, hmmm) end),
     ?line P= spawn_link(fun () -> receive die -> ok end end),
@@ -1774,6 +1782,34 @@ processes_gc_trap(Config) when is_list(Config) ->
     ?line exit(Suspendee, bang),
     ?line ok.
 
+process_flag_heap_size(doc) ->
+    [];
+process_flag_heap_size(suite) ->
+    [];
+process_flag_heap_size(Config) when is_list(Config) ->
+    HSize  = 2584,   % must be gc fib number
+    VHSize = 317811, % must be gc fib number
+    ?line OldHmin = erlang:process_flag(min_heap_size, HSize),
+    ?line {min_heap_size, HSize} = erlang:process_info(self(), min_heap_size),
+    ?line OldVHmin = erlang:process_flag(min_bin_vheap_size, VHSize),
+    ?line {min_bin_vheap_size, VHSize} = erlang:process_info(self(), min_bin_vheap_size),
+    ?line HSize = erlang:process_flag(min_heap_size, OldHmin),
+    ?line VHSize = erlang:process_flag(min_bin_vheap_size, OldVHmin),
+    ?line ok.
+
+spawn_opt_heap_size(doc) ->
+    [];
+spawn_opt_heap_size(suite) ->
+    [];
+spawn_opt_heap_size(Config) when is_list(Config) ->
+    HSize  = 987,   % must be gc fib number
+    VHSize = 46368, % must be gc fib number
+    ?line Pid  = spawn_opt(fun () -> receive stop -> ok end end,
+	[{min_heap_size, HSize},{ min_bin_vheap_size, VHSize}]),
+    ?line {min_heap_size, HSize} = process_info(Pid, min_heap_size),
+    ?line {min_bin_vheap_size, VHSize} = process_info(Pid, min_bin_vheap_size),
+    ?line Pid ! stop,
+    ?line ok.
 
 processes_term_proc_list(doc) ->
     [];