linux-kernel - Re: [PATCH 2/3] mm: trivial cleanups in vmscan.c

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Date:	Mon, 14 May 2012 17:52:30 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] mm: trivial cleanups in vmscan.c

On Sun 13-05-12 22:01:15, Hugh Dickins wrote:
> Utter trivia in mm/vmscan.c, mostly just reducing the linecount slightly;
> most exciting change being get_scan_count() calling vmscan_swappiness()
> once instead of twice.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

Looks good.
Reviewed-by: Michal Hocko <mhocko@...e.cz>

> ---
>  mm/vmscan.c |   31 ++++++++++---------------------
>  1 file changed, 10 insertions(+), 21 deletions(-)
> 
> --- 3046N.orig/mm/vmscan.c	2012-05-13 20:41:24.334117380 -0700
> +++ 3046N/mm/vmscan.c	2012-05-13 20:41:51.566118170 -0700
> @@ -1025,12 +1025,9 @@ static unsigned long isolate_lru_pages(u
>  		unsigned long *nr_scanned, struct scan_control *sc,
>  		isolate_mode_t mode, enum lru_list lru)
>  {
> -	struct list_head *src;
> +	struct list_head *src = &lruvec->lists[lru];
>  	unsigned long nr_taken = 0;
>  	unsigned long scan;
> -	int file = is_file_lru(lru);
> -
> -	src = &lruvec->lists[lru];
>  
>  	for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
>  		struct page *page;
> @@ -1058,11 +1055,8 @@ static unsigned long isolate_lru_pages(u
>  	}
>  
>  	*nr_scanned = scan;
> -
> -	trace_mm_vmscan_lru_isolate(sc->order,
> -			nr_to_scan, scan,
> -			nr_taken,
> -			mode, file);
> +	trace_mm_vmscan_lru_isolate(sc->order, nr_to_scan, scan,
> +				    nr_taken, mode, is_file_lru(lru));
>  	return nr_taken;
>  }
>  
> @@ -1140,8 +1134,7 @@ static int too_many_isolated(struct zone
>  }
>  
>  static noinline_for_stack void
> -putback_inactive_pages(struct lruvec *lruvec,
> -		       struct list_head *page_list)
> +putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
>  {
>  	struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
>  	struct zone *zone = lruvec_zone(lruvec);
> @@ -1235,11 +1228,9 @@ shrink_inactive_list(unsigned long nr_to
>  	if (global_reclaim(sc)) {
>  		zone->pages_scanned += nr_scanned;
>  		if (current_is_kswapd())
> -			__count_zone_vm_events(PGSCAN_KSWAPD, zone,
> -					       nr_scanned);
> +			__count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scanned);
>  		else
> -			__count_zone_vm_events(PGSCAN_DIRECT, zone,
> -					       nr_scanned);
> +			__count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scanned);
>  	}
>  	spin_unlock_irq(&zone->lru_lock);
>  
> @@ -1534,9 +1525,9 @@ static int inactive_file_is_low(struct l
>  	return inactive_file_is_low_global(lruvec_zone(lruvec));
>  }
>  
> -static int inactive_list_is_low(struct lruvec *lruvec, int file)
> +static int inactive_list_is_low(struct lruvec *lruvec, enum lru_list lru)
>  {
> -	if (file)
> +	if (is_file_lru(lru))
>  		return inactive_file_is_low(lruvec);
>  	else
>  		return inactive_anon_is_low(lruvec);
> @@ -1545,10 +1536,8 @@ static int inactive_list_is_low(struct l
>  static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
>  				 struct lruvec *lruvec, struct scan_control *sc)
>  {
> -	int file = is_file_lru(lru);
> -
>  	if (is_active_lru(lru)) {
> -		if (inactive_list_is_low(lruvec, file))
> +		if (inactive_list_is_low(lruvec, lru))
>  			shrink_active_list(nr_to_scan, lruvec, sc, lru);
>  		return 0;
>  	}
> @@ -1630,7 +1619,7 @@ static void get_scan_count(struct lruvec
>  	 * This scanning priority is essentially the inverse of IO cost.
>  	 */
>  	anon_prio = vmscan_swappiness(sc);
> -	file_prio = 200 - vmscan_swappiness(sc);
> +	file_prio = 200 - anon_prio;
>  
>  	/*
>  	 * OK, so we have swap space and a fair amount of page cache
> 
> --
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-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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