add /globalstep_table_{show/reset} commands

builtin/globalstep.lua

@@ -7,6 +7,10 @@ local metric_time_max = monitoring.gauge(
 	{ autoflush=true }
 )
 
+-- per mod/globalstep time table
+-- mod-name[n] => time in microseconds
+local time_table = {}
+
 -- modname -> bool
 local globalsteps_disabled = {}
 
@@ -31,6 +35,12 @@ minetest.register_on_mods_loaded(function()
       metric_time.inc(diff)
       metric_time_max.setmax(diff)
 
+			-- increment globalstep time table entry
+			local entr_key = "globalstep_" .. i .. "_" .. (info.mod or "<unknown>")
+			local tt_entry = time_table[entr_key] or 0
+			tt_entry = tt_entry + diff
+			time_table[entr_key] = tt_entry
+
       if diff > 75000 then
         minetest.log("warning", "[monitoring] globalstep took " .. diff .. " us in mod " .. (info.mod or "<unknown>"))
       end
@@ -98,3 +108,24 @@ minetest.register_chatcommand("globalstep_status", {
     return true, list
 	end
 })
+
+-- time table commands
+
+minetest.register_chatcommand("globalstep_table_reset", {
+	description = "resets the globalstep time table",
+	func = function()
+		time_table = {}
+		return true, "time table reset"
+	end
+})
+
+minetest.register_chatcommand("globalstep_table_show", {
+	description = "shows the globalstep time table",
+	func = function()
+		local str = ""
+		for modname, micros in pairs(time_table) do
+			str = str .. "+ " .. modname .. " = " .. micros .. " us\n"
+		end
+		return true, str
+	end
+})

doc/chatcommands.md

@@ -51,3 +51,11 @@ Use with care!
 ## /globalstep_status
 
 * shows all disabled globalsteps
+
+## /globalstep_table_reset
+
+* Resets the globalstep time tracking table
+
+## /globalstep_table_show
+
+* Shows the globalstep time tracking table