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

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Message-ID: <20140718071246.GA21565@dhcp22.suse.cz>
Date:	Fri, 18 Jul 2014 09:12:46 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	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, linux-kernel@...r.kernel.org
Subject: Re: [patch 13/13] mm: memcontrol: rewrite uncharge API

On Tue 15-07-14 14:19:35, Michal Hocko wrote:
> [...]
> > +/**
> > + * mem_cgroup_migrate - migrate a charge to another page
> > + * @oldpage: currently charged page
> > + * @newpage: page to transfer the charge to
> > + * @lrucare: page might be on LRU already
> 
> which one? I guess the newpage?
> 
> > + *
> > + * Migrate the charge from @oldpage to @newpage.
> > + *
> > + * Both pages must be locked, @newpage->mapping must be set up.
> > + */
> > +void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
> > +			bool lrucare)
> > +{
> > +	unsigned int nr_pages = 1;
> > +	struct page_cgroup *pc;
> > +
> > +	VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage);
> > +	VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
> > +	VM_BUG_ON_PAGE(PageLRU(oldpage), oldpage);
> > +	VM_BUG_ON_PAGE(PageLRU(newpage), newpage);
> 
> 	VM_BUG_ON_PAGE(PageLRU(newpage) && !lruvec, newpage);

I guess everything except these two notes got addressed.

-- 
Michal Hocko
SUSE Labs
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