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

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Date:   Tue, 1 Aug 2023 11:02:47 +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 8/8] mm/compaction: only set skip flag if
 cc->no_set_skip_hint is false



On 7/29/2023 1:10 AM, 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.

Um, the fast_find_migrateblock() and fast_isolate_freepages() will rely 
on the skip flag and ignore the cc->no_set_skip_hint. So not sure it is 
helpful. Let's see if Mel has some input.

> 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);
>   }
>