linux-kernel - Re: [PATCH] ocfs2: ratelimit the 'max lookup times reached' notice

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Message-ID: <85ab91b4-00c3-ce0f-2848-a19464337a56@linux.alibaba.com>
Date:   Sun, 4 Oct 2020 11:52:16 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Mauricio Faria de Oliveira <mfo@...onical.com>,
        linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com
Cc:     Mark Fasheh <mark@...heh.com>, Joel Becker <jlbec@...lplan.org>
Subject: Re: [PATCH] ocfs2: ratelimit the 'max lookup times reached' notice



On 2020/10/2 06:44, Mauricio Faria de Oliveira wrote:
> Running stress-ng on ocfs2 completely fills the kernel log with
> 'max lookup times reached, filesystem may have nested directories.'
> 
> Let's ratelimit this message as done with others in the code.
> 
> Test-case:
> 
>   # mkfs.ocfs2 --mount local $DEV
>   # mount $DEV $MNT
>   # cd $MNT
> 
>   # dmesg -C
>   # stress-ng --dirdeep 1 --dirdeep-ops 1000
>   # dmesg | grep -c 'max lookup times reached'
> 
> Before:
> 
>   # dmesg -C
>   # stress-ng --dirdeep 1 --dirdeep-ops 1000
>   ...
>   stress-ng: info:  [11116] successful run completed in 3.03s
> 
>   # dmesg | grep -c 'max lookup times reached'
>   967
> 
> After:
> 
>   # dmesg -C
>   # stress-ng --dirdeep 1 --dirdeep-ops 1000
>   ...
>   stress-ng: info:  [739] successful run completed in 0.96s
> 
>   # dmesg | grep -c 'max lookup times reached'
>   10
> 
>   # dmesg
>   [  259.086086] ocfs2_check_if_ancestor: 1990 callbacks suppressed
>   [  259.086092] (stress-ng-dirde,740,1):ocfs2_check_if_ancestor:1091 max lookup times reached, filesystem may have nested directories, src inode: 18007, dest inode: 17940.
>   ...
> 
> Signed-off-by: Mauricio Faria de Oliveira <mfo@...onical.com>

Looks good to me.
Reviewed-by: Joseph Qi <joseph.qi@...ux.alibaba.com>

> ---
>  fs/ocfs2/namei.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
> index 3c908e9416af..0043eddabdb8 100644
> --- a/fs/ocfs2/namei.c
> +++ b/fs/ocfs2/namei.c
> @@ -1095,8 +1095,8 @@ static int ocfs2_check_if_ancestor(struct ocfs2_super *osb,
>  		child_inode_no = parent_inode_no;
>  
>  		if (++i >= MAX_LOOKUP_TIMES) {
> -			mlog(ML_NOTICE, "max lookup times reached, filesystem "
> -					"may have nested directories, "
> +			mlog_ratelimited(ML_NOTICE, "max lookup times reached, "
> +					"filesystem may have nested directories, "
>  					"src inode: %llu, dest inode: %llu.\n",
>  					(unsigned long long)src_inode_no,
>  					(unsigned long long)dest_inode_no);
>