linux-kernel - Re: [PATCHv2 0/4] zsmalloc: make zspage chain size configurable

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Date:   Sun, 15 Jan 2023 13:21:33 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv2 0/4] zsmalloc: make zspage chain size configurable

On (23/01/14 13:34), Mike Kravetz wrote:
> I did the following:
> 
> - Start with clean v6.2-rc3
>   Perform echo, did not see issue
> 
> - Applied your 5 patches (includes the zsmalloc: turn chain size config option
>   into UL constant patch).  Took default value for ZSMALLOC_CHAIN_SIZE of 8.
>   Performed echo, recreated issue.
> 
> - Changed ZSMALLOC_CHAIN_SIZE to 1.
>   Perform echo, did not see issue

The patch set basically just adjusts $NUM in calculate_zspage_chain_size():

		for (i = 1; i <= $NUM; i++)

It changes default 4 to 8. Can't really see how this can cause problems.