linux-kernel - Re: [PATCH 4/10] mm/memcg: apply add/del

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Date:	Tue, 21 Feb 2012 17:20:42 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Ying Han <yinghan@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/10] mm/memcg: apply add/del_page to lruvec

On Mon, 20 Feb 2012 15:32:06 -0800 (PST)
Hugh Dickins <hughd@...gle.com> wrote:

> Go further: pass lruvec 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.
> 
> 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 the next patch.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>


Hmm.. a nitpick.

You do 
  lruvec = mem_cgroup_page_lruvec(page, zone);

What is the difference from

  lruvec = mem_cgroup_page_lruvec(page, page_zone(page)) 

?

If we have a function
  lruvec = mem_cgroup_page_lruvec(page)

Do we need 
  lruvec = mem_cgroup_page_lruvec_zone(page, zone) 

?

Thanks,
-Kame

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