linux-kernel - Re: [patch 13/13] mm: memcontrol: rewrite uncharge API

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Date:	Fri, 25 Jul 2014 17:43:20 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Tejun Heo <tj@...nel.org>,
	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch 13/13] mm: memcontrol: rewrite uncharge API

On Fri 25-07-14 11:26:54, Johannes Weiner wrote:
> On Thu, Jul 24, 2014 at 11:02:57AM +0200, Michal Hocko wrote:
> > On Thu 24-07-14 10:46:44, Michal Hocko wrote:
> > > On Wed 23-07-14 17:02:41, Johannes Weiner wrote:
> > [...]
> > > We can reduce the lookup only to lruvec==true case, no?
> > 
> > Dohh
> > s@can@...uld@
> > 
> > newpage shouldn't charged in all other cases and it would be bug.
> > Or am I missing something?
> 
> Yeah, but I'd hate to put that assumption onto the @lrucare parameter,
> it just coincides.

Yes, you are right. Maybe replace_page_cache_page should have it's own
memcg variant which does all the trickery and then call
mem_cgroup_migrate when necessary...
-- 
Michal Hocko
SUSE Labs
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