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

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Date:	Fri, 12 Jun 2009 07:52:41 +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

Otherwise, Looks good to me.
Reviewed-by: Minchan Kim <minchan.kim@...il.com>

On Thu, Jun 11, 2009 at 6:18 PM, Minchan Kim<minchan.kim@...il.com> wrote:
> 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
>



-- 
Kinds regards,
Minchan Kim
--
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