Re: [PATCH] mm: add per-order mTHP swpin counters

From: Barry Song
Date: Wed Oct 30 2024 - 03:57:55 EST


On Wed, Oct 30, 2024 at 6:29 PM Huang, Ying <ying.huang@xxxxxxxxx> wrote:
>
> Barry Song <21cnbao@xxxxxxxxx> writes:
>
> > On Wed, Oct 30, 2024 at 4:45 PM Huang, Ying <ying.huang@xxxxxxxxx> wrote:
> >>
> >> Barry Song <21cnbao@xxxxxxxxx> writes:
> >>
> >> > From: Barry Song <v-songbaohua@xxxxxxxx>
> >> >
> >> > This helps profile the sizes of folios being swapped in. Currently,
> >> > only mTHP swap-out is being counted.
> >>
> >> Better to describe the user space interface in patch description?
> >>
> >
> > Do you mean something as below?
> >
> > The new interface can be found at:
> >
> > /sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats
> > swapin
>
> Yes. Some example output may be even better.

ok. let me add some examples in changelog:

cat /sys/kernel/mm/transparent_hugepage/hugepages-64kB/stats/swpin
12809

cat /sys/kernel/mm/transparent_hugepage/hugepages-32kB/stats/swpin
4763

>
> --
> Best Regards,
> Huang, Ying