linux-kernel - Re: [PATCH 1/9] mm/compaction: use correct list in move_freelist

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Date:   Tue, 15 Aug 2023 15:16:53 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, david@...hat.com
Subject: Re: [PATCH 1/9] mm/compaction: use correct list in
 move_freelist_{head}/{tail}



On 8/5/2023 7:07 PM, Kemeng Shi wrote:
> The freepage is chained with buddy_list in freelist head. Use buddy_list
> instead of lru to correct the list operation.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>

Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> ---
>   mm/compaction.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index ea61922a1619..513b1caeb4fa 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1395,8 +1395,8 @@ move_freelist_head(struct list_head *freelist, struct page *freepage)
>   {
>   	LIST_HEAD(sublist);
>   
> -	if (!list_is_last(freelist, &freepage->lru)) {
> -		list_cut_before(&sublist, freelist, &freepage->lru);
> +	if (!list_is_last(freelist, &freepage->buddy_list)) {
> +		list_cut_before(&sublist, freelist, &freepage->buddy_list);
>   		list_splice_tail(&sublist, freelist);
>   	}
>   }
> @@ -1412,8 +1412,8 @@ move_freelist_tail(struct list_head *freelist, struct page *freepage)
>   {
>   	LIST_HEAD(sublist);
>   
> -	if (!list_is_first(freelist, &freepage->lru)) {
> -		list_cut_position(&sublist, freelist, &freepage->lru);
> +	if (!list_is_first(freelist, &freepage->buddy_list)) {
> +		list_cut_position(&sublist, freelist, &freepage->buddy_list);
>   		list_splice_tail(&sublist, freelist);
>   	}
>   }