linux-kernel - Re: [PATCH for v5.8 3/3] mm/memory: fix IO cost for anonymous page

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Date:   Mon, 29 Jun 2020 12:27:20 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     js1304@...il.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Rik van Riel <riel@...riel.com>,
        Minchan Kim <minchan.kim@...il.com>,
        Michal Hocko <mhocko@...e.com>, kernel-team@....com,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH for v5.8 3/3] mm/memory: fix IO cost for anonymous page

On 6/16/20 8:16 AM, js1304@...il.com wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> With synchronous IO swap device, swap-in is directly handled in fault
> code. Since IO cost notation isn't added there, with synchronous IO swap
> device, LRU balancing could be wrongly biased. Fix it to count it
> in fault code.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/memory.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index bc6a471..3359057 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3143,6 +3143,14 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
>  				if (err)
>  					goto out_page;
>  
> +				/*
> +				 * XXX: Move to lru_cache_add() when it
> +				 * supports new vs putback
> +				 */
> +				spin_lock_irq(&page_pgdat(page)->lru_lock);
> +				lru_note_cost_page(page);
> +				spin_unlock_irq(&page_pgdat(page)->lru_lock);
> +
>  				lru_cache_add(page);
>  				swap_readpage(page, true);
>  			}
>