linux-kernel - Re: [PATCH] f2fs: support to show noage_extent

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Message-ID: <ZCsPfukvFHhiI6vN@google.com>
Date:   Mon, 3 Apr 2023 10:40:14 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Yangtao Li <frank.li@...o.com>
Cc:     chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs: support to show noage_extent_cache mount option

On 03/31, Yangtao Li wrote:
> This patch support noage_extent_cache mount option.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>  Documentation/filesystems/f2fs.rst | 2 ++
>  fs/f2fs/super.c                    | 7 +++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index a81c896464ff..75505ab88de8 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -352,6 +352,8 @@ age_extent_cache	 Enable an age extent cache based on rb-tree. It records
>  			 data block update frequency of the extent per inode, in
>  			 order to provide better temperature hints for data block
>  			 allocation.
> +noage_extent_cache		 Disable an age extent cache based on rb-tree, see
> +			 the above age_extent_cache mount option.

Hmm, why do we need?

>  ======================== ============================================================
>  
>  Debugfs Entries
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index b5828a67f7c1..8bd9953ea7e3 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -165,6 +165,7 @@ enum {
>  	Opt_discard_unit,
>  	Opt_memory_mode,
>  	Opt_age_extent_cache,
> +	Opt_noage_extent_cache,
>  	Opt_err,
>  };
>  
> @@ -244,6 +245,7 @@ static match_table_t f2fs_tokens = {
>  	{Opt_discard_unit, "discard_unit=%s"},
>  	{Opt_memory_mode, "memory=%s"},
>  	{Opt_age_extent_cache, "age_extent_cache"},
> +	{Opt_noage_extent_cache, "noage_extent_cache"},
>  	{Opt_err, NULL},
>  };
>  
> @@ -1269,6 +1271,9 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
>  		case Opt_age_extent_cache:
>  			set_opt(sbi, AGE_EXTENT_CACHE);
>  			break;
> +		case Opt_noage_extent_cache:
> +			clear_opt(sbi, AGE_EXTENT_CACHE);
> +			break;
>  		default:
>  			f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
>  				 p);
> @@ -1974,6 +1979,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
>  		seq_puts(seq, ",noextent_cache");
>  	if (test_opt(sbi, AGE_EXTENT_CACHE))
>  		seq_puts(seq, ",age_extent_cache");
> +	else
> +		seq_puts(seq, ",noage_extent_cache");
>  	if (test_opt(sbi, DATA_FLUSH))
>  		seq_puts(seq, ",data_flush");
>  
> -- 
> 2.35.1