Re: [PATCH mm-new v3] mm/memcontrol: Add memory.stat_refresh for on-demand stats flushing

[Leon Huang Fu]

On Tue, Nov 11, 2025 at 12:04 AM Tejun Heo <tj@xxxxxxxxxx> wrote:
>
> Hello,

Hi Tejun,

>
> On Mon, Nov 10, 2025 at 02:50:11PM +0100, Michal Koutnı wrote:
> > All in all, I'd like to have more backing data on insufficiency of (all
> > the) rstat optimizations before opening explicit flushes like this
> > (especially when it's meant to be exposed by BPF already).
>
> +1. If the current behavior introduces errors too significant to ignore, I'd
> much rather see it fixed from the implementation side rather than exposing
> internal operation details like this.
>

I haven't observed any significant errors with the current behavior.

That said, I agree that we should focus on improving the flushing
implementation to enhance stats accuracy on high-core-count systems.
I'll review both the synchronous and asynchronous flushing paths to see
where we can tighten things up.

Thanks,
Leon