linux-kernel - Re: [PATCH v4] mm: add zblock allocator

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Message-ID: <gullx3kk2dogzyxopmvtrhuv5ymfsjbn5mvtwskqkjjfjinqij@s6mmdq2mfwzs>
Date: Fri, 2 May 2025 08:49:08 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Vitaly Wool <vitaly.wool@...sulko.se>
Cc: Yosry Ahmed <yosry.ahmed@...ux.dev>, linux-mm@...ck.org, 
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, Nhat Pham <nphamcs@...il.com>, 
	Shakeel Butt <shakeel.butt@...ux.dev>, Johannes Weiner <hannes@...xchg.org>, 
	Igor Belousov <igor.b@...dev.am>, Minchan Kim <minchan@...nel.org>, 
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH v4] mm: add zblock allocator

On (25/04/23 21:53), Vitaly Wool wrote:
[..]
> * zsmalloc/zstd/make -j32 bzImage
> 	real	8m0.594s
> 	user	39m37.783s
> 	sys	8m24.262s
> 	Zswap:            200600 kB <-- after build completion
> 	Zswapped:         854072 kB <-- after build completion
> 	zswpin 309774
> 	zswpout 1538332
> 
> * zblock/zstd/make -j32 bzImage
> 	real	7m35.546s
> 	user	38m03.475s
> 	sys	7m47.407s
> 	Zswap:            250940 kB <-- after build completion
> 	Zswapped:         870660 kB <-- after build completion
> 	zswpin 248606
> 	zswpout 1277319

I'm sorry but what does this test test?  That under memory pressure the
kernel swaps out different pages with different compression characteristics?