linux-kernel - Re: [PATCH 3/3] mm/memcg: apply add/del

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Message-ID: <20120514163916.GD22629@tiehlicka.suse.cz>
Date:	Mon, 14 May 2012 18:39:16 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm/memcg: apply add/del_page to lruvec

On Sun 13-05-12 22:02:28, Hugh Dickins wrote:
> Take lruvec further: pass it instead of zone to add_page_to_lru_list()
> and del_page_from_lru_list(); and pagevec_lru_move_fn() pass lruvec
> down to its target functions.
> 
> This cleanup eliminates a swathe of cruft in memcontrol.c,
> including mem_cgroup_lru_add_list(), mem_cgroup_lru_del_list() and
> mem_cgroup_lru_move_lists() - which never actually touched the lists.

Yes add_page_to_lru_list vs. mem_cgroup_lru_add_list and del variant
were really confusing.

> In their place, mem_cgroup_page_lruvec() to decide the lruvec,
> previously a side-effect of add, and mem_cgroup_update_lru_size()
> to maintain the lru_size stats.
> 
> Whilst these are simplifications in their own right, the goal is to
> bring the evaluation of lruvec next to the spin_locking of the lrus,
> in preparation for a future patch.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

I like the patch but if Konstantin has a split up version of the same
thing I would rather see that version first.

> ---
> The horror, the horror: I have three lines of 81 columns:
> I do think they look better this way than split up.

Agreed.


-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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