linux-kernel - Re: [PATCH 1/2] f2fs: fix gc mode when gc_urgent_high

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Date:   Tue, 25 Oct 2022 11:03:09 +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 1/2] f2fs: fix gc mode when gc_urgent_high_remaining is 1

On 2022/10/22 1:46, Yangtao Li wrote:
> Under the current logic, when gc_urgent_high_remaining is set to 1,
> the mode will be switched to normal at the beginning, instead of
> running in gc_urgent mode.
> 
> Let's switch the gc mode back to normal when the gc ends.
> 
> Fixes: 265576181b4a ("f2fs: remove gc_urgent_high_limited for cleanup")
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>   fs/f2fs/gc.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 4546e01b2ee0..2f113fbcb85c 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -45,6 +45,7 @@ static int gc_thread_func(void *data)
>   	set_freezable();
>   	do {
>   		bool sync_mode, foreground = false;
> +		bool gc_normal_mode = false;
>   
>   		wait_event_interruptible_timeout(*wq,
>   				kthread_should_stop() || freezing(current) ||
> @@ -101,7 +102,7 @@ static int gc_thread_func(void *data)
>   			if (sbi->gc_urgent_high_remaining) {
>   				sbi->gc_urgent_high_remaining--;
>   				if (!sbi->gc_urgent_high_remaining)
> -					sbi->gc_mode = GC_NORMAL;
> +					gc_normal_mode = true;
>   			}
>   			spin_unlock(&sbi->gc_urgent_high_lock);

So, can we move above logic to the end of loop?

>   		}
> @@ -162,6 +163,10 @@ static int gc_thread_func(void *data)
>   		/* balancing f2fs's metadata periodically */
>   		f2fs_balance_fs_bg(sbi, true);
>   next:
> +		if (gc_normal_mode) {
> +			sbi->gc_mode = GC_NORMAL;
> +			gc_normal_mode = false;
> +		}
>   		sb_end_write(sbi->sb);
>   
>   	} while (!kthread_should_stop());