linux-kernel - Re: [PATCH -mm -V2] mm, pagemap: Fix soft dirty marking for PMD migration entry

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Message-ID: <20171020092950.uikxca6ign4ydpjt@black.fi.intel.com>
Date:   Fri, 20 Oct 2017 12:29:50 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>,
        David Rientjes <rientjes@...gle.com>,
        Arnd Bergmann <arnd@...db.de>, Hugh Dickins <hughd@...gle.com>,
        Jérôme 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 -V2] mm, pagemap: Fix soft dirty marking for PMD
 migration entry

On Thu, Oct 19, 2017 at 03:10:46PM +0000, Huang, Ying wrote:
> From: Huang Ying <ying.huang@...el.com>
> 
> Now, when the page table is walked in the implementation of
> /proc/<pid>/pagemap, pmd_soft_dirty() is used for both the PMD huge
> page map and the PMD migration entries.  That is wrong,
> pmd_swp_soft_dirty() should be used for the PMD migration entries
> instead because the different page table entry flag is used.
> Otherwise, the soft dirty information in /proc/<pid>/pagemap may be
> wrong.
> 
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

As I said before, you can use my ack for this.

-- 
 Kirill A. Shutemov