From 2fddc671901ea851f8da2380de57b7baab051f9b Mon Sep 17 00:00:00 2001
From: William Yang <mscame@gmail.com>
Date: Tue, 28 Apr 2026 17:56:22 +0200
Subject: [PATCH] perf: read primary logger conf from persistent_term

---
 lib/kernel/src/logger_config.erl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/kernel/src/logger_config.erl b/lib/kernel/src/logger_config.erl
index 621e210baa77..c6fd00e1efc6 100644
--- a/lib/kernel/src/logger_config.erl
+++ b/lib/kernel/src/logger_config.erl
@@ -94,6 +94,16 @@ get(Tid) ->
     Configs = ets:match(Tid, {{?HANDLER_KEY, '_'}, '$1'}),
     lists:flatten(Configs).
 
+get(Tid, primary) ->
+    case persistent_term:get({?MODULE, table_key(primary), conf}, undefined) of
+        undefined -> 
+            [{_, Config}] = ets:lookup(Tid, table_key(primary)),
+            ok = persistent_term:put({?MODULE, table_key(primary), conf}, Config),
+            {ok, Config};
+        Config ->
+            {ok, Config}
+    end;
+
 get(Tid,What) ->
     case ets:lookup(Tid,table_key(What)) of
         [{_,Config}] ->
@@ -133,6 +143,7 @@ set(Tid,What,Config) ->
     ok = persistent_term:put({?MODULE,table_key(What)}, LevelInt),
     case What of
         primary ->
+            ok = persistent_term:put({?MODULE, table_key(What), conf}, Config),
             %% If we change primary level, then we need to flush
             %% the module level cache.
             [persistent_term:put(Key,?PRIMARY_TO_CACHE(LevelInt))