Re: [PATCH v1] sched/uclamp: Exclude kernel threads from uclamp logic

[Zihuan Zhang]

在 2025/7/10 22:03, Steven Rostedt 写道:
> On Thu, 10 Jul 2025 08:55:28 +0800
> Zihuan Zhang <zhangzihuan@xxxxxxxxxx> wrote:
>
> > The motivation behind this patch is to explore whether it’s worth
> > optimizing the uclamp hot path a bit further. Since kernel threads
> > typically don’t benefit from uclamp adjustments and often just inherit
> > default values (e.g., max=1024), we were wondering if skipping the
> > aggregation logic for such cases could slightly reduce overhead in some
> > workloads.
> >
> > Of course, we want to be conservative and avoid breaking any legitimate
> > usage. So I’d love to hear your opinion — do you think it’s worthwhile
> > to pursue this kind of micro-optimization in uclamp, or is the potential
> > gain too marginal to justify the added logic?
> My honest opinion is that if there's not a huge issue you are trying
> to solve, then it's best to leave things as is. Tweaking this for
> micro-optimizations usually end up causing a regression somewhere you
> never expected.
>
> -- Steve
Thanks for the advice! I’ll keep that in mind for my next patch.

Best regards,
Zihuan Zhang