On 2025-02-06 14:48:59 [+0100], Peter Zijlstra wrote: > On Thu, Feb 06, 2025 at 02:44:08PM +0100, Sebastian Andrzej Siewior wrote: > > SCHED_OTHER vs SCHED_OTHER after all. But please don't delay a wakeup of > > SCHED_FIFO/ RR/ DL because of this LAZY hint. > > Thing will get delayed if interrupts are disabled or kernel has > preemption disabled too. So as long as we ensure hint crap is of equal > order, nothing cares if you do. > > If you can't tell the difference between task does hint crap in > userspace and task is in the middle of syscall, you can't tell the > difference. I can tell the difference if I see a trace where an interrupt fires, performs a wakeup and the SCHED_OTHER task remains on CPU while the task SCHED_FIFO task sits on the runqueue until a timer fires. Sebastian
