linux-kernel - Re: [PATCH v2] f2fs: stop discard thread if has fsck tag

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Date:   Tue, 1 Nov 2022 23:17:49 +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 v2] f2fs: stop discard thread if has fsck tag

On 2022/10/28 22:37, Yangtao Li wrote:
> Under the current logic, after the fsck flag is set,
> the discard thread will still run periodically.
> 
> So stop the discard thread from running to avoid
> energy consumption after the fsck flag is set.
> 
> Fixes: d618477473eb ("f2fs: stop issue discard if something wrong with f2fs")
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
> v2:
> - commit msg changes.
>   fs/f2fs/segment.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 7786351de429..b3600bcadfc7 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -1716,8 +1716,8 @@ static int issue_discard_thread(void *data)
>   		if (kthread_should_stop())
>   			return 0;
>   		if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
> -			wait_ms = dpolicy.max_interval;
> -			continue;
> +			dcc->f2fs_issue_discard = NULL;
> +			return 0;

I don't think there will be much energy consumption, I guess
we can keep as it is.

>   		}
>   		if (!atomic_read(&dcc->discard_cmd_cnt))
>   			continue;