[UIManager] Reverse order of _task_queue (#9706)

spec/unit/taskqueue_bench.lua

@@ -0,0 +1,77 @@
+require("commonrequire")
+
+local UIManager = require("ui/uimanager")
+
+local time = require("ui/time")
+
+local NB_TESTS = 40000
+local noop = function() end
+
+describe("UIManager simple checkTasks and scheduling benchmark", function()
+    local now = time.now()
+    local wait_until -- luacheck: no unused
+    UIManager:quit()
+    UIManager._task_queue = {}
+
+    -- use schedule here, to be agnostic of the _task_queue order (ascending, descending).
+    for i=1, NB_TESTS/2 do
+        UIManager:schedule(now + i, noop)
+        UIManager:schedule(now + NB_TESTS - i, noop)
+    end
+
+    for i=1, NB_TESTS do
+        wait_until, now = UIManager:_checkTasks() -- luacheck: no unused
+    end
+end)
+
+describe("UIManager more advanced checkTasks and scheduling benchmark", function()
+    -- This BM is doing schedulings like the are done in real usage
+    -- with autosuspend, autodim, autowarmth and friends.
+    -- Additional _checkTask is called to better simulate bench this too.
+    local wait_until -- luacheck: no unused
+
+    local now = time.now()
+    UIManager:quit()
+
+    local function standby_dummy() end
+    local function autowarmth_dummy() end
+    local function dimmer_dummy() end
+
+    local function someTaps()
+        for j = 1,10 do
+            -- insert some random times for entering standby
+            UIManager:schedule(now + time.s(j), standby_dummy) -- standby
+            UIManager:unschedule(standby_dummy)
+        end
+    end
+
+    for i=1, NB_TESTS do
+        UIManager._task_queue = {}
+        UIManager:schedule(now + time.s(24*60*60), noop) -- shutdown
+        UIManager:schedule(now + time.s(15*60*60), noop) -- sleep
+        UIManager:schedule(now + time.s(55), noop) -- footer refresh
+        UIManager:schedule(now + time.s(130), noop) -- something
+        UIManager:schedule(now + time.s(10), noop) -- something else
+
+        for j = 1,5 do
+            someTaps()
+
+            for k = 1, 10 do
+                UIManager:schedule(now + time.s(k), standby_dummy) -- standby
+            end
+            now = now + 10
+
+            -- consume the last 10 standby_dummy, plus 10 checks.
+            for k = 1, 20 do
+                wait_until, now = UIManager:_checkTasks() -- luacheck: no unused
+            end
+
+            UIManager:schedule(now + time.s(15*60), autowarmth_dummy) -- autowarmth
+            UIManager:schedule(now + time.s(180), dimmer_dummy) -- dimmer
+
+            now = now + 30
+            UIManager:unschedule(dimmer_dummy)
+            UIManager:unschedule(autowarmth_dummy) -- remove autowarmth
+        end
+    end
+end)