linux-kernel - Re: [PATCH 6/8] mm: lru_deactivate_fn should clear PG

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Date:	Fri, 30 Oct 2015 13:47:11 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-api@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	zhangyanfei@...fujitsu.com, Rik van Riel <riel@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Evans <je@...com>, Daniel Micay <danielmicay@...il.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	yalin.wang2010@...il.com, Shaohua Li <shli@...nel.org>
Subject: Re: [PATCH 6/8] mm: lru_deactivate_fn should clear PG_referenced

On Fri 30-10-15 16:01:42, Minchan Kim wrote:
> deactivate_page aims for accelerate for reclaiming through
> moving pages from active list to inactive list so we should
> clear PG_referenced for the goal.

I might be missing something but aren't we using PG_referenced only for
pagecache (and shmem) pages?

> 
> Acked-by: Hugh Dickins <hughd@...gle.com>
> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Minchan Kim <minchan@...nel.org>
> ---
>  mm/swap.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/swap.c b/mm/swap.c
> index d0eacc5f62a3..4a6aec976ab1 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -810,6 +810,7 @@ static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec,
>  
>  		del_page_from_lru_list(page, lruvec, lru + LRU_ACTIVE);
>  		ClearPageActive(page);
> +		ClearPageReferenced(page);
>  		add_page_to_lru_list(page, lruvec, lru);
>  
>  		__count_vm_event(PGDEACTIVATE);
> -- 
> 1.9.1

-- 
Michal Hocko
SUSE Labs
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