linux-kernel - Re: [PATCH] f2fs: modify task name prefix

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Date:   Thu, 21 Jul 2022 19:43:17 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Guowei Du <duguoweisz@...il.com>
Cc:     chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, duguowei <duguowei@...omi.com>
Subject: Re: [PATCH] f2fs: modify task name prefix

On 07/18, Guowei Du wrote:
> From: duguowei <duguowei@...omi.com>
> 
> If there are more than one f2fs sbi, there will be more
> discard threads. But the comm is too long to show dev
> minor. So, change the default prefix of thread from
> "f2fs_discard" to "f2fs_dcd".

That looks quite unreadable. What about unmap?

> 
> Before:
> $ ps -e | grep f2fs
> 1628 ?        00:00:00 f2fs_ckpt-7:10
> 1629 ?        00:00:00 f2fs_flush-7:10
> 1630 ?        00:00:00 f2fs_discard-7:
> 1631 ?        00:00:00 f2fs_gc-7:10
> 2030 ?        00:00:00 f2fs_ckpt-7:27
> 2031 ?        00:00:00 f2fs_flush-7:27
> 2032 ?        00:00:00 f2fs_discard-7:
> 2033 ?        00:00:00 f2fs_gc-7:27
> 
> After:
> $ ps -e | grep f2fs
> 1628 ?        00:00:00 f2fs_ckpt-7:10
> 1629 ?        00:00:00 f2fs_flush-7:10
> 1630 ?        00:00:00 f2fs_dcd-7:10
> 1631 ?        00:00:00 f2fs_gc-7:10
> 2030 ?        00:00:00 f2fs_ckpt-7:27
> 2031 ?        00:00:00 f2fs_flush-7:27
> 2032 ?        00:00:00 f2fs_dcd-7:27
> 2033 ?        00:00:00 f2fs_gc-7:27
> 
> Signed-off-by: duguowei <duguowei@...omi.com>
> ---
>  fs/f2fs/segment.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 874c1b9c41a2..2eeefcbe62db 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -2018,7 +2018,7 @@ int f2fs_start_discard_thread(struct f2fs_sb_info *sbi)
>  		return 0;
>  
>  	dcc->f2fs_issue_discard = kthread_run(issue_discard_thread, sbi,
> -				"f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
> +				"f2fs_dcd-%u:%u", MAJOR(dev), MINOR(dev));
>  	if (IS_ERR(dcc->f2fs_issue_discard))
>  		err = PTR_ERR(dcc->f2fs_issue_discard);
>  
> -- 
> 2.36.1