Improved scheduler suspend functionality

- The calling process is now suspended while synchronizing
  scheduler suspends via erlang:system_flag(schedulers_online, _)
  and erlang:system_flag(multi_scheduling, _), instead of blocking
  the scheduler thread in the BIF call waiting for the operation
  to synchronize. Besides releasing the scheduler for other work
  (or immediate suspend) it also makes it possible to abort the
  operation by killing the process.
- erlang:system_flag(schedulers_online, _) now only wait for normal
  schedulers to complete before it returns. This since it may take
  a very long time before all dirty schedulers suspends.
- erlang:system_flag(multi_scheduling, block_normal|unblock_normal)
  which only operate on normal schedulers has been introduced. This
  since there are use cases where suspend of dirty schedulers are
  not of interest (hipe loader).
- erlang:system_flag(multi_scheduling, block) still blocks all
  dirty schedulers as well as all normal schedulers except one since
  it is hard to redefine what multi scheduling block means.
- The three operations:
  - changing amount of schedulers online
  - blocking/unblocking normal multi scheduling
  - blocking/unblocking full multi scheduling
  can now be done in parallel. This is important since otherwise
  a full multi scheduling block would potentially delay the other
  operations for a very long time.

2 files changed, 9 insertions, 9 deletions

diff --git a/lib/kernel/src/hipe_unified_loader.erl b/lib/kernel/src/hipe_unified_loader.erl
index 73fcb2469c..087cceb5d8 100644
--- a/lib/kernel/src/hipe_unified_loader.erl
+++ b/lib/kernel/src/hipe_unified_loader.erl
@@ -105,7 +105,7 @@ load_native_code(Mod, Bin, Architecture) when is_atom(Mod), is_binary(Bin) ->
   case code:get_chunk(Bin, chunk_name(Architecture)) of
     undefined -> no_native;
     NativeCode when is_binary(NativeCode) ->
-      erlang:system_flag(multi_scheduling, block),
+      erlang:system_flag(multi_scheduling, block_normal),
       try
         OldReferencesToPatch = patch_to_emu_step1(Mod),
         case load_module(Mod, NativeCode, Bin, OldReferencesToPatch,
@@ -114,7 +114,7 @@ load_native_code(Mod, Bin, Architecture) when is_atom(Mod), is_binary(Bin) ->
           Result -> Result
         end
       after
-        erlang:system_flag(multi_scheduling, unblock)
+        erlang:system_flag(multi_scheduling, unblock_normal)
       end
   end.
 
@@ -125,12 +125,12 @@ load_native_code(Mod, Bin, Architecture) when is_atom(Mod), is_binary(Bin) ->
 post_beam_load([])->
   ok;
 post_beam_load([_|_]=Mods) ->
-  erlang:system_flag(multi_scheduling, block),
+  erlang:system_flag(multi_scheduling, block_normal),
   try
     _ = [patch_to_emu(Mod) || Mod <- Mods],
     ok
   after
-    erlang:system_flag(multi_scheduling, unblock)
+    erlang:system_flag(multi_scheduling, unblock_normal)
   end,
   ok.
 
@@ -151,11 +151,11 @@ version_check(Version, Mod) when is_atom(Mod) ->
                      'bad_crc' | {'module', Mod} when Mod :: atom().
 
 load_module(Mod, Bin, Beam, Architecture) ->
-  erlang:system_flag(multi_scheduling, block),
+  erlang:system_flag(multi_scheduling, block_normal),
   try
     load_module_nosmp(Mod, Bin, Beam, Architecture)
   after
-    erlang:system_flag(multi_scheduling, unblock)
+    erlang:system_flag(multi_scheduling, unblock_normal)
   end.
 
 load_module_nosmp(Mod, Bin, Beam, Architecture) ->
@@ -173,11 +173,11 @@ load_module(Mod, Bin, Beam, OldReferencesToPatch, Architecture) ->
               'bad_crc' | {'module', Mod} when Mod :: atom().
 
 load(Mod, Bin, Architecture) ->
-  erlang:system_flag(multi_scheduling, block),
+  erlang:system_flag(multi_scheduling, block_normal),
   try
     load_nosmp(Mod, Bin, Architecture)
   after
-    erlang:system_flag(multi_scheduling, unblock)
+    erlang:system_flag(multi_scheduling, unblock_normal)
   end.
 
 load_nosmp(Mod, Bin, Architecture) ->
diff --git a/lib/kernel/src/kernel.app.src b/lib/kernel/src/kernel.app.src
index 419dc0a2fc..7452c6bc98 100644
--- a/lib/kernel/src/kernel.app.src
+++ b/lib/kernel/src/kernel.app.src
@@ -116,6 +116,6 @@
   {applications, []},
   {env, [{error_logger, tty}]},
   {mod, {kernel, []}},
-  {runtime_dependencies, ["erts-7.3", "stdlib-2.6", "sasl-2.6"]}
+  {runtime_dependencies, ["erts-8.0", "stdlib-2.6", "sasl-2.6"]}
  ]
 }.