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

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Date:	Thu, 11 Jun 2009 20:20:42 +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

2009/6/11 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>:
> Minchan Kim 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 ??
>>
> good catch. I'll post updated one tomorrow.
> I'm very sorry ;(

Never mind.  :)

> Thanks,
> -Kame
>
>
> --
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-- 
Kinds regards,
Minchan Kim
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