linux-kernel - Re: [PATCH -mm] mm, pagemap: Fix swap offset value for PMD migration entry

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Date:   Mon, 9 Apr 2018 17:47:53 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrei Vagin <avagin@...nvz.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "Jerome Glisse" <jglisse@...hat.com>,
        Daniel Colascione <dancol@...gle.com>,
        Zi Yan <zi.yan@...rutgers.edu>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [PATCH -mm] mm, pagemap: Fix swap offset value for PMD
 migration entry

On Sun,  8 Apr 2018 11:37:37 +0800 "Huang, Ying" <ying.huang@...el.com> wrote:

> From: Huang Ying <ying.huang@...el.com>
> 
> The swap offset reported by /proc/<pid>/pagemap may be not correct for
> PMD migration entry.  If addr passed into pagemap_range() isn't

pagemap_pmd_range(), yes?

> aligned with PMD start address,

How can this situation come about?

> the swap offset reported doesn't
> reflect this.  And in the loop to report information of each sub-page,
> the swap offset isn't increased accordingly as that for PFN.
> 
> BTW: migration swap entries have PFN information, do we need to
> restrict whether to show them?

For what reason?  Address obfuscation?