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

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Date:	Thu, 11 Jun 2009 20:13:46 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	"Minchan Kim" <minchan.kim@...il.com>
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"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

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 ;(

Thanks,
-Kame


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