linux-kernel - Re: [PATCH 1/2] thp: Add compound tail page

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Message-ID: <20111125131241.GZ8397@redhat.com>
Date:	Fri, 25 Nov 2011 14:12:41 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Youquan Song <youquan.song@...el.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	wli@...omorphy.com, david.woodhouse@...el.com,
	allen.m.kay@...el.com, mtosatti@...hat.com, chrisw@...hat.com,
	andi@...stfloor.org, chaohong.guo@...el.com,
	Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [PATCH 1/2] thp: Add compound tail page _mapcount when mapped

Both are needed to take care of CONFIG_DEBUG_VM false positives. Worst
case a false positive hits, but if it doesn't there was no risk because
the tail page refcounting isn't actively used by that code and the
refcounting on the head page was done right already.

Thanks,
Andrea
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