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| From | "Kirill A. Shutemov" <kirill@shutemov.name> |
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v1] mm: thp: check pmd_trans_unstable() after split_huge_pmd() |
| Date | Wed, 01 Jun 2016 11:50:02 +0200 |
| Message-ID | <rFaWK-6IP-21@gated-at.bofh.it> (permalink) |
| References | <rF2mu-1c3-9@gated-at.bofh.it> |
| X-Original-To | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> |
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| X-Original-Cc | Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com>, Mel Gorman <mgorman@techsingularity.net>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Naoya Horiguchi <nao.horiguchi@gmail.com> |
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| Xref | csiph.com linux.kernel:1411041 |
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On Wed, Jun 01, 2016 at 09:36:40AM +0900, Naoya Horiguchi wrote: > split_huge_pmd() doesn't guarantee that the pmd is normal pmd pointing to > pte entries, which can be checked with pmd_trans_unstable(). Could you be more specific on when we don't have normal ptes after split_huge_pmd? Race with other thread? DAX? I guess we can modify split_huge_pmd() to return if the pmd was split or not. -- Kirill A. Shutemov
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[PATCH v1] mm: thp: check pmd_trans_unstable() after split_huge_pmd() Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-06-01 02:40 +0200
Re: [PATCH v1] mm: thp: check pmd_trans_unstable() after split_huge_pmd() "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-06-01 11:50 +0200
Re: [PATCH v1] mm: thp: check pmd_trans_unstable() after split_huge_pmd() Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-06-02 02:40 +0200
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