Hi, On 28/08/18 14:53, Patrick Bellasi wrote: [...] > Let's introduce a new API to set utilization clamping values for a > specified task by extending sched_setattr, a syscall which already > allows to define task specific properties for different scheduling > classes. > Specifically, a new pair of attributes allows to specify a minimum and > maximum utilization which the scheduler should consider for a task. AFAIK sched_setattr currently mandates that a policy is always specified [1]. I was wondering if relaxing such requirement might be handy. Being util clamp a cross-class feature it might be cumbersome to always have to get current policy/params and use those with new umin/umax just to change the latter. sched_setparam already uses the in-kernel SETPARAM_POLICY thing, maybe we could extend that to sched_setattr? Not sure exposing this to userspace is a good idea though. :-/ Best, - Juri 1 - https://elixir.bootlin.com/linux/v4.19-rc2/source/kernel/sched/core.c#L4564
