linux-kernel - Re: [PATCH 64 of 66] scale nr_rotated to balance memory pressure

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Date:	Tue,  9 Nov 2010 15:16:21 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 64 of 66] scale nr_rotated to balance memory pressure

> From: Rik van Riel <riel@...hat.com>
> 
> Make sure we scale up nr_rotated when we encounter a referenced
> transparent huge page.  This ensures pageout scanning balance
> is not distorted when there are huge pages on the LRU.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> ---
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1259,7 +1259,8 @@ putback_lru_pages(struct zone *zone, str
>  		add_page_to_lru_list(zone, page, lru);
>  		if (is_active_lru(lru)) {
>  			int file = is_file_lru(lru);
> -			reclaim_stat->recent_rotated[file]++;
> +			int numpages = hpage_nr_pages(page);
> +			reclaim_stat->recent_rotated[file] += numpages;
>  		}
>  		if (!pagevec_add(&pvec, page)) {
>  			spin_unlock_irq(&zone->lru_lock);

I haven't seen this patch series carefully yet. So, probably
my question is dumb. Why don't we need to change ->recent_scanned[] too?



> @@ -1535,7 +1536,7 @@ static void shrink_active_list(unsigned 
>  		}
>  
>  		if (page_referenced(page, 0, sc->mem_cgroup, &vm_flags)) {
> -			nr_rotated++;
> +			nr_rotated += hpage_nr_pages(page);
>  			/*
>  			 * Identify referenced, file-backed active pages and
>  			 * give them one more trip around the active list. So



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