linux-kernel - Re: [PATCH 8/8] mm/compaction: only set skip flag if cc->no_set_skip

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Message-ID: <06d566cc-fa03-f68f-e0a4-236567ae5684@redhat.com>
Date:   Fri, 28 Jul 2023 12:33:10 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        baolin.wang@...ux.alibaba.com, mgorman@...hsingularity.net,
        willy@...radead.org
Subject: Re: [PATCH 8/8] mm/compaction: only set skip flag if
 cc->no_set_skip_hint is false

On 28.07.23 19:10, Kemeng Shi wrote:
> Keep the same logic as update_pageblock_skip, only set skip if
> no_set_skip_hint is false which is more reasonable.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> ---
>   mm/compaction.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 188d610eb3b6..6841c0496223 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1418,7 +1418,7 @@ fast_isolate_around(struct compact_control *cc, unsigned long pfn)
>   	isolate_freepages_block(cc, &start_pfn, end_pfn, &cc->freepages, 1, false);
>   
>   	/* Skip this pageblock in the future as it's full or nearly full */
> -	if (start_pfn == end_pfn)
> +	if (start_pfn == end_pfn && !cc->no_set_skip_hint)
>   		set_pageblock_skip(page);
>   }
>   

LGTM, although I am not an expert on that code.

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb