Re: [PATCH v2] freezer,sched: Use saved_state to reduce some spurious wakeups

[Peter Zijlstra]

On Fri, Sep 08, 2023 at 01:08:07PM -0700, Elliot Berman wrote:

> > Perhaps we should start off by doing the below, instead of making it
> > more complicated instead. I suppose you're right about the overhead, but
> > run a hackbench just to make sure or something.
> > 
> 
> I ran perf bench sched message -g 40 -l 40 with the v3 patch [1]. After 60
> iterations each, I don't see a significant difference on my arm64 platform:
> both samples ~normal and ~eq variance w/t-test p-value: 0.79.
> 
> We also ran typical high level benchmarks for our SoCs (antutu,
> geekbench, et. al) and didn't see any regressions there.

So if you would've made this 2 patches, the first removing the ifdef,
then the changelog for that patch would be a good place to mention it
doesn't measurably regress things.

As a bonus, it then makes your other changes smaller too ;-)