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File 0754-erts-Restore-the-number-of-dirty-schedulers-in-sched.patch of Package erlang (Revision b4f72044e1af8cfe32130ab849a401a1)

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From 3e2a5bb3b1ff4e0a19fae99434eaccdcadac622c Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Thu, 25 Nov 2021 17:33:52 +0100
Subject: [PATCH 09/11] erts: Restore the number of dirty schedulers in
 scheduler SUITE

If the number of dirty schedulers is set to 1 when the number of
schedulers is not when the scheduler_wall_time testcase runs things
start to deadlock as processes that need to run on dirty schedulers
are starved.
---
 erts/emulator/test/scheduler_SUITE.erl  | 5 ++++-
 erts/emulator/test/statistics_SUITE.erl | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/erts/emulator/test/scheduler_SUITE.erl b/erts/emulator/test/scheduler_SUITE.erl
index faf16a96ef..f1683769dc 100644
--- a/erts/emulator/test/scheduler_SUITE.erl
+++ b/erts/emulator/test/scheduler_SUITE.erl
@@ -94,6 +94,7 @@ end_per_suite(Config) ->
     catch erts_debug:set_internal_state(available_internal_state, false),
     SchedOnln = proplists:get_value(schedulers_online, Config),
     erlang:system_flag(schedulers_online, SchedOnln),
+    erlang:system_flag(dirty_cpu_schedulers_online, SchedOnln),
     Config.
 
 init_per_testcase(update_cpu_info, Config) ->
@@ -1248,10 +1249,12 @@ scheduler_suspend_basic(Config) when is_list(Config) ->
 	    {skip, "Nothing to test"};
 	_ ->
 	    Onln = erlang:system_info(schedulers_online),
+	    DirtyOnln = erlang:system_info(dirty_cpu_schedulers_online),
 	    try
 		scheduler_suspend_basic_test()
 	    after
-		erlang:system_flag(schedulers_online, Onln)
+		erlang:system_flag(schedulers_online, Onln),
+		erlang:system_flag(dirty_cpu_schedulers_online, DirtyOnln)
 	    end
     end.
 
diff --git a/erts/emulator/test/statistics_SUITE.erl b/erts/emulator/test/statistics_SUITE.erl
index 90fbedb94a..a336b54044 100644
--- a/erts/emulator/test/statistics_SUITE.erl
+++ b/erts/emulator/test/statistics_SUITE.erl
@@ -356,6 +356,9 @@ run_scheduler_wall_time_test(Type) ->
                 DirtyCPUSchedulers,
                 DirtyIOSchedulers]),
 
+        %% Assert that number of schedulers is the same as number of dirty schedulers
+        Schedulers = DirtyCPUSchedulers,
+
         %% Let testserver and everyone else finish their work
         timer:sleep(1500),
         %% Empty load
-- 
2.31.1

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File 0754-erts-Restore-the-number-of-dirty-schedulers-in-sched.patch of Package erlang (Revision b4f72044e1af8cfe32130ab849a401a1)

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