Re: [RFC PATCH 5/6] sched/uclamp: Remove all uclamp bucket logic

[Hongyan Xia]

On 03/11/2023 13:50, Dietmar Eggemann wrote:
> On 04/10/2023 11:04, Hongyan Xia wrote:
> > From: Hongyan Xia <hongyan.xia2@xxxxxxx>
> >
> > Also rewrite uclamp_update_active() so that the effective uclamp values
> > are updated every time we change task group properties, change system
> > defaults or a request is issued from userspace.
>
> Tested it with
>
> # cgcreate -g cpu:/A
> # echo $$ > /sys/fs/cgroup/cpu/A/tasks
>
> (1) per-task
>
> # uclampset --pid $$  -m 256 -M 768
>
> (2) per taskgroup
>
> # echo 25.0 > /sys/fs/cgroup/cpu/A/cpu.uclamp.min
> # echo 75.0 > /sys/fs/cgroup/cpu/A/cpu.uclamp.max
>
> (3) system-wide
>
> # echo 256 > /proc/sys/kernel/sched_util_clamp_min
> # echo 768 > /proc/sys/kernel/sched_util_clamp_max
>
> uclamp_update_active() -> uclamp_update_active_nolock() is called in all
> cases.

Thanks for testing!

> uclamp_eff_get()'s function header still mentions `clamp bucket index`.

This is indeed confusing. I have changed it from 'clamp bucket index' to 
just 'uclamp value'.

> > [...]
>
> [...]