From c4f1c83003810bac3a73cb6d526218ca8760838b Mon Sep 17 00:00:00 2001
From: "Zaiming (Stone) Shi" <zmstone@gmail.com>
Date: Sun, 26 Jun 2022 21:16:55 +0200
Subject: [PATCH] chore: return system total and used memory in node_info

---
 apps/emqx_management/src/emqx_mgmt.erl | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/apps/emqx_management/src/emqx_mgmt.erl b/apps/emqx_management/src/emqx_mgmt.erl
index 51bc193d8..948088f8e 100644
--- a/apps/emqx_management/src/emqx_mgmt.erl
+++ b/apps/emqx_management/src/emqx_mgmt.erl
@@ -136,13 +136,13 @@ list_nodes() ->
 lookup_node(Node) -> node_info(Node).
 
 node_info(Node) when Node =:= node() ->
-    Memory  = emqx_vm:get_memory(),
+    {UsedRatio, Total} = get_sys_memory(),
     Info = maps:from_list([{K, list_to_binary(V)} || {K, V} <- emqx_vm:loads()]),
     BrokerInfo = emqx_sys:info(),
     Info#{node              => node(),
           otp_release       => iolist_to_binary(otp_rel()),
-          memory_total      => proplists:get_value(allocated, Memory),
-          memory_used       => proplists:get_value(used, Memory),
+          memory_total      => Total,
+          memory_used       => erlang:round(Total * UsedRatio),
           process_available => erlang:system_info(process_limit),
           process_used      => erlang:system_info(process_count),
           max_fds           =>
@@ -156,6 +156,14 @@ node_info(Node) when Node =:= node() ->
 node_info(Node) ->
     rpc_call(Node, node_info, [Node]).
 
+get_sys_memory() ->
+    case os:type() of
+        {unix, linux} ->
+            load_ctl:get_sys_memory();
+        _ ->
+            {0, 0}
+    end.
+
 stopped_node_info(Node) ->
     #{name => Node, node_status => 'Stopped'}.