linux-kernel - Re: [PATCH 5/5] have smaps show transparent huge pages

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Message-ID: <1297350115.6737.14208.camel@nimitz>
Date:	Thu, 10 Feb 2011 07:01:55 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael J Wolf <mjwolf@...ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 5/5] have smaps show transparent huge pages

On Thu, 2011-02-10 at 11:20 +0000, Mel Gorman wrote:
> > @@ -394,6 +395,7 @@ static int smaps_pte_range(pmd_t *pmd, u
> >                       spin_lock(&walk->mm->page_table_lock);
> >               } else {
> >                       smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_SIZE, walk);
> > +                     mss->anonymous_thp += HPAGE_SIZE;
> 
> I should have thought of this for the previous patch but should this be
> HPAGE_PMD_SIZE instead of HPAGE_SIZE? Right now, they are the same value
> but they are not the same thing.

Probably.  There's also a nice BUG() in HPAGE_PMD_SIZE if the THP config
option is off, which is an added bonus.

-- Dave

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