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

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Message-ID: <f8063d3fa7e148fecdda82e40b36e10a@beldev.am>
Date: Mon, 07 Apr 2025 13:00:36 +0400
From: Igor Belousov <igor.b@...dev.am>
To: vitaly.wool@...sulko.se
Cc: Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
 akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, Nhat Pham
 <nphamcs@...il.com>, Shakeel Butt <shakeel.butt@...ux.dev>
Subject: Re: [PATCH v2] mm: add zblock allocator

>>> 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