linux-kernel - Re: [PATCH 1/3] remove wrong rotation at lumpy reclaim

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Date:	Thu, 11 Jun 2009 18:18:10 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"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, mel@....ul.ie
Subject: Re: [PATCH 1/3] remove wrong rotation at lumpy reclaim

On Thu, Jun 11, 2009 at 5:00 PM, KAMEZAWA
Hiroyuki<kamezawa.hiroyu@...fujitsu.com> wrote:
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>
> At lumpy reclaim, a page failed to be taken by __isolate_lru_page() can
> be pushed back to "src" list by list_move(). But the page may not be from
> "src" list. And list_move() itself is unnecessary because the page is
> not on top of LRU. Then, leave it as it is if __isolate_lru_page() fails.
>
> This patch doesn't change the logic as "we should exit loop or not" and
> just fixes buggy list_move().
>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> ---
>  mm/vmscan.c |    9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
>
> Index: lumpy-reclaim-trial/mm/vmscan.c
> ===================================================================
> --- lumpy-reclaim-trial.orig/mm/vmscan.c
> +++ lumpy-reclaim-trial/mm/vmscan.c
> @@ -936,18 +936,11 @@ 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;
> -                       switch (__isolate_lru_page(cursor_page, mode, file)) {
> -                       case 0:
> +                       if (__isolate_lru_page(cursor_page, mode, file) == 0) {
>                                list_move(&cursor_page->lru, dst);
>                                nr_taken++;
>                                scan++;
>                                break;

break ??

-- 
Kinds regards,
Minchan Kim