linux-kernel - Re: [PATCH v2] mm: add zblock allocator

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Message-ID: <CAKEwX=MXD9EB242WkB50ZBmZgV-CwrAHp=_oE+e=7yHDfrMHtg@mail.gmail.com>
Date: Mon, 7 Apr 2025 10:00:16 -0700
From: Nhat Pham <nphamcs@...il.com>
To: Igor Belousov <igor.b@...dev.am>
Cc: vitaly.wool@...sulko.se, Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org, 
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	Shakeel Butt <shakeel.butt@...ux.dev>
Subject: Re: [PATCH v2] mm: add zblock allocator

On Mon, Apr 7, 2025 at 9:44 AM Igor Belousov <igor.b@...dev.am> wrote:
>
> Hi Nhat,
>
> 2025-04-07 19:51 skrev Nhat Pham:
> > On Mon, Apr 7, 2025 at 2:00 AM Igor Belousov <igor.b@...dev.am> 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.

Can you try zstd and let me know how it goes :)

>
> > And does the zswpwb come from zswap shrinker?
>
> Haven't looked into that, to be honest.

Can you check:

/sys/module/zswap/parameters/shrinker_enabled

>
> /Igor