linux-kernel - Re: [PATCH 2/3] check unevictable flag in lumy reclaim

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Message-Id: <20090611172249.6D3C.A69D9226@jp.fujitsu.com>
Date:	Thu, 11 Jun 2009 17:24:58 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	apw@...onical.com, riel@...hat.com, minchan.kim@...il.com,
	mel@....ul.ie
Subject: Re: [PATCH 2/3] check unevictable flag in lumy reclaim

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Lumpy reclaim scans pages from their pfn. Then, it can find unevictable pages
> in its loop. Abort lumpy reclaim when we find Unevictable page, we never get a
> block of pages for requested order.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> ---
> Index: lumpy-reclaim-trial/mm/vmscan.c
> ===================================================================
> --- lumpy-reclaim-trial.orig/mm/vmscan.c
> +++ lumpy-reclaim-trial/mm/vmscan.c
> @@ -936,6 +936,9 @@ static unsigned long isolate_lru_pages(u
>  			/* Check that we have not crossed a zone boundary. */
>  			if (unlikely(page_zone_id(cursor_page) != zone_id))
>  				continue;
> +			/* Abort when the page is mlocked */
> +			if (unlikely(PageUnevictable(cursor_page)))
> +				break;
>  			if (__isolate_lru_page(cursor_page, mode, file) == 0) {
>  				list_move(&cursor_page->lru, dst);
>  				nr_taken++;
> 

The code is good. thanks.

But please comment adding more. plus, unevictable is made by multiple reason.
not only mlock. please fix misleading comment.


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