linux-kernel - Re: [PATCH v6 6/7] mm/memcg: kill mem_cgroup_lru

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Date:	Mon, 26 Mar 2012 20:05:33 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Michal Hocko <mhocko@...e.cz>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH v6 6/7] mm/memcg: kill mem_cgroup_lru_del()

Michal Hocko wrote:
> On Fri 23-03-12 01:56:39, Konstantin Khlebnikov wrote:
>> This patch kills mem_cgroup_lru_del(), we can use mem_cgroup_lru_del_list()
>> instead. On 0-order isolation we already have right lru list id.
>>
>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
>> Cc: Hugh Dickins<hughd@...gle.com>
>
> Yes, looks good
> Acked-by: Michal Hocko<mhocko@...e.cz>
>
> Just a small nit..
> [...]
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index 5f6ed98..9de66be 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
> [...]
>> @@ -1205,8 +1205,11 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
>>
>>   			if (__isolate_lru_page(cursor_page, mode) == 0) {
>>   				unsigned int isolated_pages;
>> +				enum lru_list cursor_lru;
>>
>> -				mem_cgroup_lru_del(cursor_page);
>> +				cursor_lru = page_lru(cursor_page);
>> +				mem_cgroup_lru_del_list(cursor_page,
>> +							cursor_lru);
>
> Why not mem_cgroup_lru_del_list(cursor_page,
> 				page_lru(cursor_page));
> The patch would be smaller and it doesn't make checkpatch unhappy as well.

Lumpy-reclaim supposed to be removed soon, so...

>
>>   				list_move(&cursor_page->lru, dst);
>>   				isolated_pages = hpage_nr_pages(cursor_page);
>>   				nr_taken += isolated_pages;
>>
>> --
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