linux-kernel - Re: [PATCH v2 5/9] mm/vmscan: activate swap-backed executable folios after first usage

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Date:   Tue, 12 Apr 2022 08:59:17 +0800
From:   "ying.huang@...el.com" <ying.huang@...el.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     songmuchun@...edance.com, hch@...radead.org, willy@...radead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/9] mm/vmscan: activate swap-backed executable
 folios after first usage

On Sat, 2022-04-09 at 17:34 +0800, Miaohe Lin wrote:
> We should activate swap-backed executable folios (e.g. tmpfs) after first
> usage so that executable code gets yet better chance to stay in memory.
> 
> Suggested-by: Huang, Ying <ying.huang@...el.com>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>

Reviewed-by: Huang, Ying <ying.huang@...el.com>

Best Regards,
Huang, Ying

> ---
>  mm/vmscan.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 0e5818970998..cc1193e320c2 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1412,9 +1412,9 @@ static enum page_references folio_check_references(struct folio *folio,
>  			return PAGEREF_ACTIVATE;
>  
> 
> 
> 
>  		/*
> -		 * Activate file-backed executable folios after first usage.
> +		 * Activate executable folios after first usage.
>  		 */
> -		if ((vm_flags & VM_EXEC) && !folio_test_swapbacked(folio))
> +		if (vm_flags & VM_EXEC)
>  			return PAGEREF_ACTIVATE;
>  
> 
> 
> 
>  		return PAGEREF_KEEP;