From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Christoph Lameter <cl@gentwo.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Steve Capper <steve.capper@linaro.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Jerome Marchand <jmarchan@redhat.com>, Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCH 05/36] mm: adjust FOLL_SPLIT for new refcounting Date: Fri, 10 Jul 2015 20:41:39 +0300 [thread overview] Message-ID: <1436550130-112636-6-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1436550130-112636-1-git-send-email-kirill.shutemov@linux.intel.com> We need to prepare kernel to allow transhuge pages to be mapped with ptes too. We need to handle FOLL_SPLIT in follow_page_pte(). Also we use split_huge_page() directly instead of split_huge_page_pmd(). split_huge_page_pmd() will gone. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> --- mm/gup.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 49 insertions(+), 18 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index 6297f6bccfb1..2dd6706ea29f 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -79,6 +79,19 @@ retry: page = pte_page(pte); } + if (flags & FOLL_SPLIT && PageTransCompound(page)) { + int ret; + get_page(page); + pte_unmap_unlock(ptep, ptl); + lock_page(page); + ret = split_huge_page(page); + unlock_page(page); + put_page(page); + if (ret) + return ERR_PTR(ret); + goto retry; + } + if (flags & FOLL_GET) get_page_foll(page); if (flags & FOLL_TOUCH) { @@ -186,27 +199,45 @@ struct page *follow_page_mask(struct vm_area_struct *vma, } if ((flags & FOLL_NUMA) && pmd_protnone(*pmd)) return no_page_table(vma, flags); - if (pmd_trans_huge(*pmd)) { - if (flags & FOLL_SPLIT) { + if (likely(!pmd_trans_huge(*pmd))) + return follow_page_pte(vma, address, pmd, flags); + + ptl = pmd_lock(mm, pmd); + if (unlikely(!pmd_trans_huge(*pmd))) { + spin_unlock(ptl); + return follow_page_pte(vma, address, pmd, flags); + } + + if (unlikely(pmd_trans_splitting(*pmd))) { + spin_unlock(ptl); + wait_split_huge_page(vma->anon_vma, pmd); + return follow_page_pte(vma, address, pmd, flags); + } + + if (flags & FOLL_SPLIT) { + int ret; + page = pmd_page(*pmd); + if (is_huge_zero_page(page)) { + spin_unlock(ptl); + ret = 0; split_huge_page_pmd(vma, address, pmd); - return follow_page_pte(vma, address, pmd, flags); - } - ptl = pmd_lock(mm, pmd); - if (likely(pmd_trans_huge(*pmd))) { - if (unlikely(pmd_trans_splitting(*pmd))) { - spin_unlock(ptl); - wait_split_huge_page(vma->anon_vma, pmd); - } else { - page = follow_trans_huge_pmd(vma, address, - pmd, flags); - spin_unlock(ptl); - *page_mask = HPAGE_PMD_NR - 1; - return page; - } - } else + } else { + get_page(page); spin_unlock(ptl); + lock_page(page); + ret = split_huge_page(page); + unlock_page(page); + put_page(page); + } + + return ret ? ERR_PTR(ret) : + follow_page_pte(vma, address, pmd, flags); } - return follow_page_pte(vma, address, pmd, flags); + + page = follow_trans_huge_pmd(vma, address, pmd, flags); + spin_unlock(ptl); + *page_mask = HPAGE_PMD_NR - 1; + return page; } static int get_gate_page(struct mm_struct *mm, unsigned long address, -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Christoph Lameter <cl@gentwo.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Steve Capper <steve.capper@linaro.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Jerome Marchand <jmarchan@redhat.com>, Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCH 05/36] mm: adjust FOLL_SPLIT for new refcounting Date: Fri, 10 Jul 2015 20:41:39 +0300 [thread overview] Message-ID: <1436550130-112636-6-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1436550130-112636-1-git-send-email-kirill.shutemov@linux.intel.com> We need to prepare kernel to allow transhuge pages to be mapped with ptes too. We need to handle FOLL_SPLIT in follow_page_pte(). Also we use split_huge_page() directly instead of split_huge_page_pmd(). split_huge_page_pmd() will gone. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> --- mm/gup.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 49 insertions(+), 18 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index 6297f6bccfb1..2dd6706ea29f 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -79,6 +79,19 @@ retry: page = pte_page(pte); } + if (flags & FOLL_SPLIT && PageTransCompound(page)) { + int ret; + get_page(page); + pte_unmap_unlock(ptep, ptl); + lock_page(page); + ret = split_huge_page(page); + unlock_page(page); + put_page(page); + if (ret) + return ERR_PTR(ret); + goto retry; + } + if (flags & FOLL_GET) get_page_foll(page); if (flags & FOLL_TOUCH) { @@ -186,27 +199,45 @@ struct page *follow_page_mask(struct vm_area_struct *vma, } if ((flags & FOLL_NUMA) && pmd_protnone(*pmd)) return no_page_table(vma, flags); - if (pmd_trans_huge(*pmd)) { - if (flags & FOLL_SPLIT) { + if (likely(!pmd_trans_huge(*pmd))) + return follow_page_pte(vma, address, pmd, flags); + + ptl = pmd_lock(mm, pmd); + if (unlikely(!pmd_trans_huge(*pmd))) { + spin_unlock(ptl); + return follow_page_pte(vma, address, pmd, flags); + } + + if (unlikely(pmd_trans_splitting(*pmd))) { + spin_unlock(ptl); + wait_split_huge_page(vma->anon_vma, pmd); + return follow_page_pte(vma, address, pmd, flags); + } + + if (flags & FOLL_SPLIT) { + int ret; + page = pmd_page(*pmd); + if (is_huge_zero_page(page)) { + spin_unlock(ptl); + ret = 0; split_huge_page_pmd(vma, address, pmd); - return follow_page_pte(vma, address, pmd, flags); - } - ptl = pmd_lock(mm, pmd); - if (likely(pmd_trans_huge(*pmd))) { - if (unlikely(pmd_trans_splitting(*pmd))) { - spin_unlock(ptl); - wait_split_huge_page(vma->anon_vma, pmd); - } else { - page = follow_trans_huge_pmd(vma, address, - pmd, flags); - spin_unlock(ptl); - *page_mask = HPAGE_PMD_NR - 1; - return page; - } - } else + } else { + get_page(page); spin_unlock(ptl); + lock_page(page); + ret = split_huge_page(page); + unlock_page(page); + put_page(page); + } + + return ret ? ERR_PTR(ret) : + follow_page_pte(vma, address, pmd, flags); } - return follow_page_pte(vma, address, pmd, flags); + + page = follow_trans_huge_pmd(vma, address, pmd, flags); + spin_unlock(ptl); + *page_mask = HPAGE_PMD_NR - 1; + return page; } static int get_gate_page(struct mm_struct *mm, unsigned long address, -- 2.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-07-10 17:48 UTC|newest] Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-07-10 17:41 [PATCH 00/36] THP refcounting redesign Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 01/36] mm, proc: adjust PSS calculation Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 02/36] rmap: add argument to charge compound page Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 03/36] memcg: adjust to support new THP refcounting Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-14 13:58 ` Kirill A. Shutemov 2015-07-14 13:58 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 04/36] mm, thp: adjust conditions when we can reuse the page on WP fault Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov [this message] 2015-07-10 17:41 ` [PATCH 05/36] mm: adjust FOLL_SPLIT for new refcounting Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 06/36] mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 07/36] thp, mlock: do not allow huge pages in mlocked area Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 08/36] khugepaged: ignore pmd tables with THP mapped with ptes Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 09/36] thp: rename split_huge_page_pmd() to split_huge_pmd() Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 10/36] mm, vmstats: new THP splitting event Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 11/36] mm: temporally mark THP broken Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 12/36] thp: drop all split_huge_page()-related code Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 13/36] mm: drop tail page refcounting Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-14 14:01 ` Kirill A. Shutemov 2015-07-14 14:01 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 14/36] futex, thp: remove special case for THP in get_futex_key Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 15/36] ksm: prepare to new THP semantics Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 16/36] mm, thp: remove compound_lock Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-14 14:02 ` Kirill A. Shutemov 2015-07-14 14:02 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 17/36] arm64, thp: remove infrastructure for handling splitting PMDs Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-15 15:23 ` Suzuki K. Poulose 2015-07-15 15:23 ` Suzuki K. Poulose 2015-07-10 17:41 ` [PATCH 18/36] arm, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 19/36] mips, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 20/36] powerpc, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-15 11:31 ` Aneesh Kumar K.V 2015-07-15 11:31 ` Aneesh Kumar K.V 2015-07-10 17:41 ` [PATCH 21/36] s390, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 22/36] sparc, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 23/36] tile, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 24/36] x86, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 25/36] mm, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 26/36] mm: rework mapcount accounting to enable 4k mapping of THPs Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-12 19:13 ` Kirill A. Shutemov 2015-07-12 19:13 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 27/36] mm: differentiate page_mapped() from page_mapcount() for compound pages Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 28/36] mm, numa: skip PTE-mapped THP on numa fault Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 29/36] thp: implement split_huge_pmd() Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 30/36] thp: add option to setup migration entiries during PMD split Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 31/36] thp, mm: split_huge_page(): caller need to lock page Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 32/36] thp: reintroduce split_huge_page() Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 33/36] migrate_pages: try to split pages on qeueuing Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 34/36] thp: introduce deferred_split_huge_page() Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 35/36] mm: re-enable THP Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 36/36] thp: update documentation Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-14 14:05 ` Kirill A. Shutemov 2015-07-14 14:05 ` Kirill A. Shutemov 2015-07-14 9:06 ` [PATCH 00/36] THP refcounting redesign Jerome Marchand 2015-07-14 15:29 ` Kirill A. Shutemov 2015-07-14 15:29 ` Kirill A. Shutemov 2015-07-15 11:30 ` Aneesh Kumar K.V 2015-07-15 11:30 ` Aneesh Kumar K.V
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