![]() Prevent or lower the chance of preemption from happening to other tasks so that it won't interrupt other important tasks or drivers from operating or functioning which leads to lower latency for other tasks.Scheduling ticks, RCU operations and others are now bound to CPU 0 as it helps to isolate other cores from getting the noise of ticks, scheduling mechanisms that happens frequently across all cores.Changed workqueue operation tasks and threads to CPU 0 to isolate from other cores which leads to elimination other cores from getting exposed to unimportant tasks, interruptions or even race to it.Merged some Samsung's media enc/dec-coding drivers updates from newer Samsung devices.Upstreamed Scheduler further to latest patches and commits.Undervolted the whole SOC for CPU Bus/CPU Clusters/GPU/DDR and other subsystems.Latest Kernel source from Samsung is being used.Kernel Changes on OneUI Compared to latest ones are:. Making all the noise ticks to 1 little core and isolating all other cores clean and relaxed on casual usages. another one during casual usage/sessions.This lowers latencies and improving determinism.Ī full example about what is happening during those scenarios of dynamic tick :. These can reduce the number of OS-related interrupts and reduce packet transit times. This allows to run continuously on the CPU with as few interruptions as possible to other cores and keeping all the polling, ticks, and others to 1 core at least. Running without a timer tick means the kernel does less work when idle and can potentially save power because it does not have to wake up regularly just to service the timer. The timer tick is a timer interrupt that is usually generated HZ times per second. That enables a kernel to run without a regular timer tick. The call is necessary as the interrupt handler might have armed a new timer whose expiry time is before the time which was identified as the nearest event in the previous call to hrtimer. The function is also called when an interrupt happens during the idle period, which does not cause a reschedule. The code evaluates the next scheduled timer event (from both hrtimers and the timer wheel) and in case that the next event is further away than the next tick it reprograms the sched_tick to this future event, to allow longer idle sleeps without worthless interruption by the periodic tick. Kernel are now using a Dynamic Tick which will be called when a CPU goes into idle state. This is a huge list which I will try to simplify it as much as possible. This the stable release for Android OneUI 2.1 ROM.
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