linux-kernel - Re: [PATCH v2 05/12] mm: thp: add core routines for thp/pmd migration

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Message-Id: <58218942.8010608@linux.vnet.ibm.com>
Date:   Tue, 8 Nov 2016 13:43:54 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>, linux-mm@...ck.org
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Pavel Emelyanov <xemul@...allels.com>,
        Zi Yan <zi.yan@...rutgers.edu>,
        Balbir Singh <bsingharora@...il.com>,
        linux-kernel@...r.kernel.org,
        Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v2 05/12] mm: thp: add core routines for thp/pmd migration

On 11/08/2016 05:01 AM, Naoya Horiguchi wrote:
> This patch prepares thp migration's core code. These code will be open when
> unmap_and_move() stops unconditionally splitting thp and get_new_page() starts
> to allocate destination thps.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
> ChangeLog v1 -> v2:
> - support pte-mapped thp, doubly-mapped thp
> ---
>  arch/x86/include/asm/pgtable_64.h |   2 +
>  include/linux/swapops.h           |  61 +++++++++++++++
>  mm/huge_memory.c                  | 154 ++++++++++++++++++++++++++++++++++++++
>  mm/migrate.c                      |  44 ++++++++++-
>  mm/pgtable-generic.c              |   3 +-
>  5 files changed, 262 insertions(+), 2 deletions(-)
> 
> diff --git v4.9-rc2-mmotm-2016-10-27-18-27/arch/x86/include/asm/pgtable_64.h v4.9-rc2-mmotm-2016-10-27-18-27_patched/arch/x86/include/asm/pgtable_64.h
> index 1cc82ec..3a1b48e 100644
> --- v4.9-rc2-mmotm-2016-10-27-18-27/arch/x86/include/asm/pgtable_64.h
> +++ v4.9-rc2-mmotm-2016-10-27-18-27_patched/arch/x86/include/asm/pgtable_64.h
> @@ -167,7 +167,9 @@ static inline int pgd_large(pgd_t pgd) { return 0; }
>  					 ((type) << (SWP_TYPE_FIRST_BIT)) \
>  					 | ((offset) << SWP_OFFSET_FIRST_BIT) })
>  #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
> +#define __pmd_to_swp_entry(pte)		((swp_entry_t) { pmd_val((pmd)) })

The above macro takes *pte* but evaluates on *pmd*, guess its should
be fixed either way.