observer: Fix memory and scheduler info and handle missing fields

Fix app viewer crash

1 files changed, 13 insertions, 2 deletions

diff --git a/lib/runtime_tools/src/observer_backend.erl b/lib/runtime_tools/src/observer_backend.erl
index 202129c61a..68ef04f20c 100644
--- a/lib/runtime_tools/src/observer_backend.erl
+++ b/lib/runtime_tools/src/observer_backend.erl
@@ -53,6 +53,13 @@ sys_info() ->
 		  Mem -> Mem
 	      catch _:_ -> []
 	      end,
+
+    SchedulersOnline = erlang:system_info(schedulers_online),
+    SchedulersAvailable = case erlang:system_info(multi_scheduling) of
+			      enabled -> SchedulersOnline;
+			      _ -> 1
+			  end,
+
     {{_,Input},{_,Output}} = erlang:statistics(io),
     [{process_count, erlang:system_info(process_count)},
      {process_limit, erlang:system_info(process_limit)},
@@ -60,9 +67,13 @@ sys_info() ->
      {run_queue, erlang:statistics(run_queue)},
      {io_input, Input},
      {io_output,  Output},
+
      {logical_processors, erlang:system_info(logical_processors)},
-     {logical_processors_available, erlang:system_info(logical_processors_available)},
      {logical_processors_online, erlang:system_info(logical_processors_online)},
+     {logical_processors_available, erlang:system_info(logical_processors_available)},
+     {schedulers, erlang:system_info(schedulers)},
+     {schedulers_online, SchedulersOnline},
+     {schedulers_available, SchedulersAvailable},
 
      {otp_release, erlang:system_info(otp_release)},
      {version, erlang:system_info(version)},
@@ -221,7 +232,7 @@ fetch_stats_loop(Parent, Time) ->
 	    _M = Parent ! {stats, 1,
 			   erlang:statistics(scheduler_wall_time),
 			   erlang:statistics(io),
-			   erlang:memory()},
+			   try erlang:memory() catch _:_ -> [] end},
 	    fetch_stats_loop(Parent, Time)
     end.
 %%