linux-kernel - Re: [PATCH 5/8] mm/compaction: corret comment of cached migrate pfn update

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Message-ID: <726ad4b3-3f80-f32c-7a3b-7299f82b0381@linux.alibaba.com>
Date:   Tue, 1 Aug 2023 10:45:35 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        mgorman@...hsingularity.net, willy@...radead.org, david@...hat.com
Subject: Re: [PATCH 5/8] mm/compaction: corret comment of cached migrate pfn
 update



On 7/29/2023 1:10 AM, Kemeng Shi wrote:
> Commit e380bebe47715 ("mm, compaction: keep migration source private to
> a single compaction instance") moved update of async and sync
> compact_cached_migrate_pfn from update_pageblock_skip to
> update_cached_migrate but left the comment behind.
> Move the relevant comment to correct this.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>

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

> ---
>   mm/compaction.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 09c36251c613..1eebb61a1f63 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -464,6 +464,7 @@ static void update_cached_migrate(struct compact_control *cc, unsigned long pfn)
>   
>   	pfn = pageblock_end_pfn(pfn);
>   
> +	/* Update where async and sync compaction should restart */
>   	if (pfn > zone->compact_cached_migrate_pfn[0])
>   		zone->compact_cached_migrate_pfn[0] = pfn;
>   	if (cc->mode != MIGRATE_ASYNC &&
> @@ -485,7 +486,6 @@ static void update_pageblock_skip(struct compact_control *cc,
>   
>   	set_pageblock_skip(page);
>   
> -	/* Update where async and sync compaction should restart */
>   	if (pfn < zone->compact_cached_free_pfn)
>   		zone->compact_cached_free_pfn = pfn;
>   }