linux-kernel - Re: [PATCH] f2fs: define DEFAULT_SMALL_VOLUME_DISCARD

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Message-ID: <6565e795-d0bb-1e96-7c8e-94409dfd69cb@kernel.org>
Date:   Wed, 23 Nov 2022 23:46:46 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yangtao Li <frank.li@...o.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs: define DEFAULT_SMALL_VOLUME_DISCARD_GRANULARITY
 macro

On 2022/11/19 2:02, Yangtao Li wrote:
> Do cleanup in f2fs_tuning_parameters(), let's use macro
> instead of number.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>   fs/f2fs/f2fs.h  | 2 ++
>   fs/f2fs/super.c | 2 +-
>   2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index f0833638f59e..86c651884d26 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -329,6 +329,8 @@ struct discard_entry {
>   	unsigned char discard_map[SIT_VBLOCK_MAP_SIZE];	/* segment discard bitmap */
>   };
>   
> +/* default discard granularity for small device, unit: block count */
> +#define DEFAULT_SMALL_VOLUME_DISCARD_GRANULARITY 1

/* minimum discard granularity, unit: block count */
#define MIN_DISCARD_GRANULARITY		1

>   /* default discard granularity of inner discard thread, unit: block count */
>   #define DEFAULT_DISCARD_GRANULARITY		16
>   /* default maximum discard granularity of ordered discard, unit: block count */
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 31435c8645c8..7c32eabcf50c 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -4080,7 +4080,7 @@ static void f2fs_tuning_parameters(struct f2fs_sb_info *sbi)
>   	/* adjust parameters according to the volume size */
>   	if (MAIN_SEGS(sbi) <= SMALL_VOLUME_SEGMENTS) {
>   		if (f2fs_block_unit_discard(sbi))
> -			SM_I(sbi)->dcc_info->discard_granularity = 1;
> +			SM_I(sbi)->dcc_info->discard_granularity = DEFAULT_SMALL_VOLUME_DISCARD_GRANULARITY;

			SM_I(sbi)->dcc_info->discard_granularity =
						MIN_DISCARD_GRANULARITY;

Thanks,

>   		SM_I(sbi)->ipu_policy = 1 << F2FS_IPU_FORCE |
>   					1 << F2FS_IPU_HONOR_OPU_WRITE;
>   	}