linux-kernel - Re: [PATCHv3 11/11] mm: Use updated pmdp_invalidate() interface to track dirty/accessed bits

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Message-ID: <20171213101336.np2tin32o5ppvion@black.fi.intel.com>
Date:   Wed, 13 Dec 2017 13:13:36 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "David S. Miller" <davem@...emloft.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 11/11] mm: Use updated pmdp_invalidate() interface to
 track dirty/accessed bits

On Wed, Sep 13, 2017 at 02:08:58AM +0000, Aneesh Kumar K.V wrote:
> @@ -2011,6 +2036,8 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
>  			if (soft_dirty)
>  				entry = pte_mksoft_dirty(entry);
>  		}
> +		if (dirty)
> +			SetPageDirty(page + i);
>  		pte = pte_offset_map(&_pmd, addr);
>  		BUG_ON(!pte_none(*pte));
>  		set_pte_at(mm, addr, pte, entry);

The patch is fine. But we don't need to set every 4k dirty. We have single
dirty bit for whole THP. I'll change this part and sent the patch as part
of the series.

-- 
 Kirill A. Shutemov