linux-kernel - Re: [PATCH 06/19] mm: store mapcount for compound page separate

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Message-ID: <alpine.DEB.2.11.1411201405140.14867@gentwo.org>
Date:	Thu, 20 Nov 2014 14:06:53 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
cc:	Jerome Marchand <jmarchan@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 06/19] mm: store mapcount for compound page separate

On Wed, 19 Nov 2014, Kirill A. Shutemov wrote:

> I don't think we want to bloat struct page description: nobody outside of
> helpers should use it direcly. And it's exactly what we did to store
> compound page destructor and compound page order.

This is more like a description what overloading is occurring. Either
add the new way of using it there including a comment explainng things or
please do not overload the field.

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