linux-kernel - Re: [PATCH] f2fs: don't bother wait

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Date:   Thu, 21 Jul 2022 19:40:26 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     qixiaoyu1 <qxy65535@...il.com>
Cc:     chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, qixiaoyu1 <qixiaoyu1@...omi.com>
Subject: Re: [PATCH] f2fs: don't bother wait_ms by foreground gc

On 07/18, qixiaoyu1 wrote:
> f2fs_gc returns -EINVAL via f2fs_balance_fs when there is enough free
> secs after write checkpoint, but with gc_merge enabled, it will cause
> the sleep time of gc thread to be set to no_gc_sleep_time even if there
> are many dirty segments can be selected.
> 
> Signed-off-by: qixiaoyu1 <qixiaoyu1@...omi.com>
> ---
>  fs/f2fs/gc.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index d5fb426e0747..cb8ca992d986 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -150,8 +150,12 @@ static int gc_thread_func(void *data)
>  		gc_control.nr_free_secs = foreground ? 1 : 0;
>  
>  		/* if return value is not zero, no victim was selected */
> -		if (f2fs_gc(sbi, &gc_control))
> -			wait_ms = gc_th->no_gc_sleep_time;
> +		if (f2fs_gc(sbi, &gc_control)) {
> +			/* don't bother wait_ms by foreground gc */
> +			if (!foreground) {
> +				wait_ms = gc_th->no_gc_sleep_time;
> +			}

I applied without {} to match the coding style.

Thanks,

> +		}
>  
>  		if (foreground)
>  			wake_up_all(&gc_th->fggc_wq);
> -- 
> 2.36.1