linux-kernel - Re: [PATCH v2 5/8] mm: memcontrol: rename lruvec_holds_page_lru_lock to page_matches

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Date:   Fri, 16 Apr 2021 08:01:08 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     guro@...com, hannes@...xchg.org, akpm@...ux-foundation.org,
        shakeelb@...gle.com, vdavydov.dev@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        duanxiongchun@...edance.com
Subject: Re: [PATCH v2 5/8] mm: memcontrol: rename lruvec_holds_page_lru_lock
 to page_matches_lruvec

On Fri 16-04-21 13:14:04, Muchun Song wrote:
> lruvec_holds_page_lru_lock() doesn't check anything about locking and is
> used to check whether the page belongs to the lruvec. So rename it to
> page_matches_lruvec().
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Acked-by: Michal Hocko <mhocko@...e.com>

Thanks

> ---
>  include/linux/memcontrol.h | 7 +++----
>  mm/vmscan.c                | 2 +-
>  2 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 2fc728492c9b..40b0c31ea4ba 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -1492,8 +1492,7 @@ static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
>  	spin_unlock_irqrestore(&lruvec->lru_lock, flags);
>  }
>  
> -static inline bool lruvec_holds_page_lru_lock(struct page *page,
> -					      struct lruvec *lruvec)
> +static inline bool page_matches_lruvec(struct page *page, struct lruvec *lruvec)
>  {
>  	return lruvec_pgdat(lruvec) == page_pgdat(page) &&
>  	       lruvec_memcg(lruvec) == page_memcg(page);
> @@ -1504,7 +1503,7 @@ static inline struct lruvec *relock_page_lruvec_irq(struct page *page,
>  		struct lruvec *locked_lruvec)
>  {
>  	if (locked_lruvec) {
> -		if (lruvec_holds_page_lru_lock(page, locked_lruvec))
> +		if (page_matches_lruvec(page, locked_lruvec))
>  			return locked_lruvec;
>  
>  		unlock_page_lruvec_irq(locked_lruvec);
> @@ -1518,7 +1517,7 @@ static inline struct lruvec *relock_page_lruvec_irqsave(struct page *page,
>  		struct lruvec *locked_lruvec, unsigned long *flags)
>  {
>  	if (locked_lruvec) {
> -		if (lruvec_holds_page_lru_lock(page, locked_lruvec))
> +		if (page_matches_lruvec(page, locked_lruvec))
>  			return locked_lruvec;
>  
>  		unlock_page_lruvec_irqrestore(locked_lruvec, *flags);
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index bb8321026c0c..2bc5cf409958 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2062,7 +2062,7 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
>  		 * All pages were isolated from the same lruvec (and isolation
>  		 * inhibits memcg migration).
>  		 */
> -		VM_BUG_ON_PAGE(!lruvec_holds_page_lru_lock(page, lruvec), page);
> +		VM_BUG_ON_PAGE(!page_matches_lruvec(page, lruvec), page);
>  		add_page_to_lru_list(page, lruvec);
>  		nr_pages = thp_nr_pages(page);
>  		nr_moved += nr_pages;
> -- 
> 2.11.0

-- 
Michal Hocko
SUSE Labs