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From: Chao Yu <yuchao0@huawei.com>
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <linux-f2fs-devel@lists.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH v3] f2fs: avoid fi->i_gc_rwsem[WRITE] lock in f2fs_gc
Date: Fri, 10 Aug 2018 09:36:29 +0800
Message-ID: <b09cdcf8-f8cd-98b6-54c1-82b2fb0f8b81@huawei.com> (raw)
In-Reply-To: <20180809195917.GA27087@jaegeuk-macbookpro.roam.corp.google.com>

On 2018/8/10 3:59, Jaegeuk Kim wrote:
> Yup, how about this?
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index d816c328f02b..cb510fb36523 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -1052,6 +1052,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>  		.iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
>  	};
>  	unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
> +	unsigned long long first_skipped;
>  	unsigned int skipped_round = 0, round = 0;
>  
>  	trace_f2fs_gc_begin(sbi->sb, sync, background,
> @@ -1064,8 +1065,10 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>  				prefree_segments(sbi));
>  
>  	cpc.reason = __get_cp_reason(sbi);
> -	sbi->skipped_gc_rwsem = 0;
>  gc_more:
> +	sbi->skipped_gc_rwsem = 0;
> +	first_skipped = last_skipped;
> +
>  	if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
>  		ret = -EINVAL;
>  		goto stop;
> @@ -1126,8 +1129,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>  			goto gc_more;
>  		}
>  
> -		if (sbi->skipped_atomic_files[FG_GC] == last_skipped &&
> -				sbi->skipped_atomic_files[FG_GC] >
> +		if (first_skipped < last_skipped &&
> +				(last_skipped - first_skipped) >

IMO, it would be better to judge the condition with skipped number in all round
of FGGC instead of last round, since number in last round may not very accurate.

Thoughts?

Thanks,

>  						sbi->skipped_gc_rwsem) {
>  			f2fs_drop_inmem_pages_all(sbi, true);
>  			segno = NULL_SEGNO;
> 
> .
> 


  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-30  1:32 [PATCH] " Jaegeuk Kim
2018-07-30  3:29 ` Chao Yu
2018-07-30  4:18   ` Jaegeuk Kim
2018-07-30  6:36     ` Chao Yu
2018-07-30  9:08       ` Jaegeuk Kim
2018-07-30  9:28         ` Chao Yu
2018-07-30 10:00           ` Jaegeuk Kim
2018-08-04  2:31             ` [f2fs-dev] " Chao Yu
2018-08-12 10:24               ` Chao Yu
2018-08-13 20:12                 ` Jaegeuk Kim
2018-08-14  6:21                   ` Chao Yu
2018-08-04 22:29 ` [PATCH v2] " Jaegeuk Kim
2018-08-05 14:42   ` [f2fs-dev] " Chao Yu
2018-08-05 16:08     ` Jaegeuk Kim
2018-08-05 16:34   ` [f2fs-dev] [PATCH v3] " Jaegeuk Kim
2018-08-09  1:44     ` Chao Yu
2018-08-09 19:59       ` Jaegeuk Kim
2018-08-10  1:36         ` Chao Yu [this message]
2018-08-10  1:46           ` Jaegeuk Kim
2018-08-20  7:13             ` Chao Yu

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