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

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Message-ID: <f023ba8341f9b44610cc4ac00cf0ee33@beldev.am>
Date: Mon, 07 Apr 2025 20:44:17 +0400
From: Igor Belousov <igor.b@...dev.am>
To: Nhat Pham <nphamcs@...il.com>
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

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.

> And does the zswpwb come from zswap shrinker?

Haven't looked into that, to be honest.

/Igor