Re: [PATCH v2] mm: Add configuration to control whether vmpressure notifier is enabled

[yong w]

> All those reasons should be a part of the changelog.
>....
> I am not sure these are sufficient justifications but that is something
> to discuss. And hence it should be a part of the changelog.
>
OK, These reasons will be added to the patch notesin later versions.

> > 3. In the case where the user does not need vmpressure,  vmpressure
> > calculation is additional overhead.
>
> You should quantify that and argue why that overhead cannot be further
> reduced without config/boot time knobs.
>
The test results of the previously used PFT tool may not be obvious.
Is there a better way to quantify it?

> > In some special scenes with tight memory, vmpressure will be executed
> > frequently.we use "likely" and "inline"
> > to improve the performance of the kernel, why not reduce some
> > unnecessary calculations?
>
> I am all for improving the code. Is it possible to do it by other means?
> E.g. reduce a potential overhead when there no events registered?
Yes, the method you mentioned may be feasible, but it does not conflict
with this patch.

Thanks.