linux-kernel - Re: [PATCHv3 4/5] mm: make compound

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Message-ID: <alpine.DEB.2.11.1508211109460.27769@east.gentwo.org>
Date:	Fri, 21 Aug 2015 11:11:27 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv3 4/5] mm: make compound_head() robust

On Fri, 21 Aug 2015, Kirill A. Shutemov wrote:

> > Is this really true?  For example if it's a slab page, will that page
> > ever be inspected by code which is looking for the PageTail bit?
>
> +Christoph.
>
> What we know for sure is that space is not used in tail pages, otherwise
> it would collide with current compound_dtor.

Sl*b allocators only do a virt_to_head_page on tail pages.
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