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J. Nick Koston
a70ec9ec06
The main loop used to feed the watchdog unconditionally right after Scheduler::call() returned, regardless of whether the scheduler had any actual work to do. On an idle device this meant every outer loop iteration paid the inline rate-limit check (load + sub + branch) for no benefit. Move the feed into Scheduler::execute_item_() so it fires only after a scheduled callback actually runs, and covers both the main heap path and the defer queue path (both go through execute_item_). This also bounds the max feed gap during a burst of back-to-back scheduled items by max(item_runtime) instead of sum(item_runtime). The top-of-loop feed in Application::before_loop_tasks_() is now unnecessary — when Scheduler::call does no work, the only elapsed time is the sleep wake plus a few instructions, and when it does have work, it fed the wdt as it went.
