linux-kernel - Re: [PATCH 19/25] mm, vmscan: Account in vmstat for pages skipped during reclaim

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Date:	Fri, 12 Jun 2015 16:49:44 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"Mel Gorman" <mgorman@...e.de>
Cc:	<linux-mm@...ck.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Rik van Riel" <riel@...hat.com>,
	"Johannes Weiner" <hannes@...xchg.org>,
	"Michal Hocko" <mhocko@...e.cz>
Subject: Re: [PATCH 19/25] mm, vmscan: Account in vmstat for pages skipped during reclaim

> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1326,6 +1326,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
> 
>  	for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
>  		struct page *page;
> +		struct zone *zone;
>  		int nr_pages;
> 
>  		page = lru_to_page(src);
> @@ -1333,8 +1334,11 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
> 
>  		VM_BUG_ON_PAGE(!PageLRU(page), page);
> 
> -		if (page_zone_id(page) > sc->reclaim_idx)
> +		zone = page_zone(page);
> +		if (page_zone_id(page) > sc->reclaim_idx) {
>  			list_move(&page->lru, &pages_skipped);
> +			__count_zone_vm_events(PGSCAN_SKIP, page_zone(page), 1);
> +		}
The newly added zone is not used.
> 
>  		switch (__isolate_lru_page(page, mode)) {
>  		case 0:

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