linux-kernel - Re: [PATCH RFC 05/29] mm/balloon_compaction: make PageOffline sticky

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Message-ID: <D114CF56-016B-4140-97A0-42163727EB6C@nvidia.com>
Date: Wed, 18 Jun 2025 14:50:57 -0400
From: Zi Yan <ziy@...dia.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
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Subject: Re: [PATCH RFC 05/29] mm/balloon_compaction: make PageOffline sticky

On 18 Jun 2025, at 13:39, David Hildenbrand wrote:

> Let the buddy handle clearing the type.

The below might be more precise? Since page type is cleared
before the page reaches buddy code.

Let the free page routine handle clearing the type.

>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  include/linux/balloon_compaction.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h
> index b9f19da37b089..bfc6e50bd004b 100644
> --- a/include/linux/balloon_compaction.h
> +++ b/include/linux/balloon_compaction.h
> @@ -140,7 +140,7 @@ static inline void balloon_page_finalize(struct page *page)
>  		__ClearPageMovable(page);
>  		set_page_private(page, 0);
>  	}
> -	__ClearPageOffline(page);
> +	/* PageOffline is sticky until the page is freed to the buddy. */
>  }
>
>  /*
> -- 
> 2.49.0

Acked-by: Zi Yan <ziy@...dia.com>

Best Regards,
Yan, Zi