Re: [PATCH v2] mm: add zblock allocator

[Igor Belousov]

Hi Nhat,

2025-04-07 19:51 skrev Nhat Pham:
> On Mon, Apr 7, 2025 at 2:00 AM Igor Belousov <igor.b@xxxxxxxxx> wrote:
> > >>> Do you have zswap/zswapped meminfo metrics from these tests?
> > >> Yep, and those look somewhat similar:
> > >>  - zblock:
> > >> Zswap:            234128 kB
> > >> Zswapped:         733216 kB
> > >> -  zsmalloc:
> > >> Zswap:            286080 kB
> > >> Zswapped:         774688 kB
> > >
> > > I tested the kernel build on a 4-core virtual machine with allocated 4
> > > GB RAM running on a Ryzen 9.
> > >
> > > The results are the following:
> > [...]
> >
> > Now what's funny is that when I tried to compare how 32 threaded build
> > would behave on a 8-core VM I couldn't do it because it OOMs with
> > zsmalloc as zswap backend. With zblock it doesn't, though, and the
> > results are:
> > real    12m14.012s
> > user    39m37.777s
> > sys     14m6.923s
> > Zswap:            440148 kB
> > Zswapped:         924452 kB
> > zswpin 594812
> > zswpout 2802454
> > zswpwb 10878
> >
> > /Igor
>
> May I ask what compression algorithm you are using?

It's LZ4 for all the test runs.

> And does the zswpwb come from zswap shrinker?

Haven't looked into that, to be honest.

/Igor