| Date | Wed, 5 Sep 2018 13:01:08 +0200 | From | Juri Lelli <> | Subject | Re: [PATCH v4 01/16] sched/core: uclamp: extend sched_setattr to support utilization clamping |
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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
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