linux-kernel - Re: [RFC] mm:fix zero_page huge_zero

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Message-ID: <20141210110556.GA10630@node.dhcp.inet.fi>
Date:	Wed, 10 Dec 2014 13:05:56 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Konstantin Khlebnikov' <koct9i@...il.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-mm@...ck.org'" <linux-mm@...ck.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'n-horiguchi@...jp.nec.com'" <n-horiguchi@...jp.nec.com>,
	"'oleg@...hat.com'" <oleg@...hat.com>,
	"'gorcunov@...nvz.org'" <gorcunov@...nvz.org>,
	"'pfeiner@...gle.com'" <pfeiner@...gle.com>
Subject: Re: [RFC] mm:fix zero_page huge_zero_page rss/pss statistic

On Wed, Dec 10, 2014 at 03:22:21PM +0800, Wang, Yalin wrote:
> smaps_pte_entry() doesn't ignore zero_huge_page,
> but it ignore zero_page, because vm_normal_page() will
> ignore it. We remove vm_normal_page() call, because walk_page_range()
> have ignore VM_PFNMAP vma maps, it's safe to just use pfn_valid(),
> so that we can also consider zero_page to be a valid page.

We fixed huge zero page accounting in smaps recentely. See mm tree.

-- 
 Kirill A. Shutemov
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