Re: [PATCH v3] vmstat: Kernel stack usage histogram

[Andrew Morton]

On Thu, 30 May 2024 20:14:17 -0400 Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> wrote:

> > Couple of questions:
> >
> > 1. In future with your on-demand kstack allocation feature, will these
> > metrics still be useful? (I think so but I want to know your take)

I do think the changelog for this patch should reference the dynamic
stack feature.  It strengthens the justification for adding this patch.

> It depends on how on-demand allocation is implemented. On hardware
> that supports faults on kernel stacks, we will have other metrics that
> show the total number of pages allocated for stacks. On hardware where
> faults are not supported, we will most likely have some optimization
> where only some threads are extended, and for those, these metrics
> will still be very useful.

Also useful changelog info for this patch.

Pasha, could you please prepare some additional text which I can paste
in?  Thanks.