linux-kernel - Re: [f2fs-dev] [PATCH 1/3] f2fs: skip GC when section is full

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Date:   Mon, 17 Feb 2020 09:40:48 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH 1/3] f2fs: skip GC when section is full

On 2020/2/15 2:58, Jaegeuk Kim wrote:
> This fixes skipping GC when segment is full in large section.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/gc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 53312d7bc78b..65c0687ee2bb 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -1018,8 +1018,8 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
>  		 * race condition along with SSR block allocation.
>  		 */
>  		if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
> -				get_valid_blocks(sbi, segno, false) ==
> -							sbi->blocks_per_seg)
> +				get_valid_blocks(sbi, segno, true) ==
> +							BLKS_PER_SEC(sbi))

Then in large section, if current segment is all valid, we won't skip scanning
it, so do we need to change like this:

if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
	get_valid_blocks(sbi, segno, false) == sbi->blocks_per_seg ||
	get_valid_blocks(sbi, segno, true) == BLKS_PER_SEC(sbi))
	return submitted;

>  			return submitted;
>  
>  		if (check_valid_map(sbi, segno, off) == 0)
>