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

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Message-ID: <20120326152315.GC22754@tiehlicka.suse.cz>
Date:	Mon, 26 Mar 2012 17:23:15 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.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()

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.

>  				list_move(&cursor_page->lru, dst);
>  				isolated_pages = hpage_nr_pages(cursor_page);
>  				nr_taken += isolated_pages;
> 
> --
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-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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