linux-kernel - Re: f2fs: set *_data_age_threshold according to user_block

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Message-ID: <Y9ZcxUjQs4Hb0ZoT@mi-HP-ProDesk-680-G4-MT>
Date:   Sun, 29 Jan 2023 19:47:17 +0800
From:   qixiaoyu <qxy65535@...il.com>
To:     Yangtao Li <frank.li@...o.com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        xiongping1@...omi.com, qixiaoyu1@...omi.com,
        linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: f2fs: set *_data_age_threshold according to user_block_count

On Tue, Jan 17, 2023 at 09:38:14PM +0800, Yangtao Li wrote:
> Hi qixiaoyu,
> 
> > The block age here refers to total data blocks allocated of filesystem between two consecutive updates.
> 
> Yes, you are right.
> 
> > So, it has nothing to do with storage size.
> 
> But I think that the total data blocks allocated of filesystem between two consecutive updates
> has something to do with the storage size. For example, for a 60M f2fs image, the lifetime_write_kbytes
> will hardly reach 10G, or even 1G.
> 
> Thx,
> Yangtao

Hi Yangtao,

Block update frequency may related to applications and usage patterns,
not storage size. A 1G f2fs image may have a similar block age to a
10G f2fs image when running the same program.

So, it might not be a good idea to decide the *_data_age_threshold
based on user_block_count.

Thanks,