linux-kernel - Re: [PATCH 2/5] mm/compaction: set compact_cached_free_pfn correctly in update_pageblock

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Date:   Wed, 2 Aug 2023 10:32:45 +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
Cc:     mgorman@...hsingularity.net, willy@...radead.org, david@...hat.com
Subject: Re: [PATCH 2/5] mm/compaction: set compact_cached_free_pfn correctly
 in update_pageblock_skip



On 7/30/2023 1:43 AM, Kemeng Shi wrote:
> We will set skip to page block of block_start_pfn, it's more reasonable
> to set compact_cached_free_pfn to page block before the block_start_pfn.

Looks reasonable to me.
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> ---
>   mm/compaction.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index d1d28d57e5bd..4a784872565a 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1690,7 +1690,8 @@ static void isolate_freepages(struct compact_control *cc)
>   
>   		/* Update the skip hint if the full pageblock was scanned */
>   		if (isolate_start_pfn >= block_end_pfn)
> -			update_pageblock_skip(cc, page, block_start_pfn);
> +			update_pageblock_skip(cc, page, block_start_pfn -
> +					      pageblock_nr_pages);
>   
>   		/* Are enough freepages isolated? */
>   		if (cc->nr_freepages >= cc->nr_migratepages) {