linux-kernel - Re: [v3 PATCH] mm: thp: register mm for khugepaged when merging vma for shmem

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Date:   Sat, 23 Jun 2018 01:10:36 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     hughd@...gle.com, kirill.shutemov@...ux.intel.com, vbabka@...e.cz,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v3 PATCH] mm: thp: register mm for khugepaged when merging vma
 for shmem

On Sat, Jun 23, 2018 at 04:03:11AM +0800, Yang Shi wrote:
> When merging anonymous page vma, if the size of vma can fit in at least
> one hugepage, the mm will be registered for khugepaged for collapsing
> THP in the future.
> 
> But, it skips shmem vma. Doing so for shmem too, but not file-private
> mapping, when merging vma in order to increase the odd to collapse
> hugepage by khugepaged.
> 
> hugepage_vma_check() sounds like a good fit to do the check. And, moved
> the definition of it before khugepaged_enter_vma_merge() to suppress
> build error.
> 
> Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov