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: [PATCHv7 08/36] khugepaged: ignore pmd tables with THP mapped with ptes Date: Tue, 23 Jun 2015 16:46:18 +0300 [thread overview] Message-ID: <1435067206-92901-9-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1435067206-92901-1-git-send-email-kirill.shutemov@linux.intel.com> Prepare khugepaged to see compound pages mapped with pte. For now we won't collapse the pmd table with such pte. khugepaged is subject for future rework wrt new refcounting. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Jerome Marchand <jmarchan@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> --- mm/huge_memory.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 4ad975506c1b..a5423bee0109 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2680,6 +2680,11 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, page = vm_normal_page(vma, _address, pteval); if (unlikely(!page)) goto out_unmap; + + /* TODO: teach khugepaged to collapse THP mapped with pte */ + if (PageCompound(page)) + goto out_unmap; + /* * Record which node the original page is from and save this * information to khugepaged_node_load[]. @@ -2690,7 +2695,6 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, if (khugepaged_scan_abort(node)) goto out_unmap; khugepaged_node_load[node]++; - VM_BUG_ON_PAGE(PageCompound(page), page); if (!PageLRU(page) || PageLocked(page) || !PageAnon(page)) goto out_unmap; /* -- 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: [PATCHv7 08/36] khugepaged: ignore pmd tables with THP mapped with ptes Date: Tue, 23 Jun 2015 16:46:18 +0300 [thread overview] Message-ID: <1435067206-92901-9-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1435067206-92901-1-git-send-email-kirill.shutemov@linux.intel.com> Prepare khugepaged to see compound pages mapped with pte. For now we won't collapse the pmd table with such pte. khugepaged is subject for future rework wrt new refcounting. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Jerome Marchand <jmarchan@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> --- mm/huge_memory.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 4ad975506c1b..a5423bee0109 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2680,6 +2680,11 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, page = vm_normal_page(vma, _address, pteval); if (unlikely(!page)) goto out_unmap; + + /* TODO: teach khugepaged to collapse THP mapped with pte */ + if (PageCompound(page)) + goto out_unmap; + /* * Record which node the original page is from and save this * information to khugepaged_node_load[]. @@ -2690,7 +2695,6 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, if (khugepaged_scan_abort(node)) goto out_unmap; khugepaged_node_load[node]++; - VM_BUG_ON_PAGE(PageCompound(page), page); if (!PageLRU(page) || PageLocked(page) || !PageAnon(page)) goto out_unmap; /* -- 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:[~2015-06-23 13:47 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-06-23 13:46 [PATCHv7 00/36] THP refcounting redesign Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 01/36] mm, proc: adjust PSS calculation Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 02/36] rmap: add argument to charge compound page Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 03/36] memcg: adjust to support new THP refcounting Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 04/36] mm, thp: adjust conditions when we can reuse the page on WP fault Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 05/36] mm: adjust FOLL_SPLIT for new refcounting Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 06/36] mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 07/36] thp, mlock: do not allow huge pages in mlocked area Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov [this message] 2015-06-23 13:46 ` [PATCHv7 08/36] khugepaged: ignore pmd tables with THP mapped with ptes Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 09/36] thp: rename split_huge_page_pmd() to split_huge_pmd() Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 10/36] mm, vmstats: new THP splitting event Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 11/36] mm: temporally mark THP broken Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 12/36] thp: drop all split_huge_page()-related code Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 13/36] mm: drop tail page refcounting Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 14/36] futex, thp: remove special case for THP in get_futex_key Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 15/36] ksm: prepare to new THP semantics Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 16/36] mm, thp: remove compound_lock Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 17/36] arm64, thp: remove infrastructure for handling splitting PMDs Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 18/36] arm, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 19/36] mips, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 20/36] powerpc, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 21/36] s390, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 22/36] sparc, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 23/36] tile, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 24/36] x86, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 25/36] mm, " Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 26/36] mm: rework mapcount accounting to enable 4k mapping of THPs Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 27/36] mm: differentiate page_mapped() from page_mapcount() for compound pages Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 28/36] mm, numa: skip PTE-mapped THP on numa fault Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 29/36] thp: implement split_huge_pmd() Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 30/36] thp: add option to setup migration entiries during PMD split Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 31/36] thp, mm: split_huge_page(): caller need to lock page Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 32/36] thp: reintroduce split_huge_page() Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 33/36] migrate_pages: try to split pages on qeueuing Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 34/36] thp: introduce deferred_split_huge_page() Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 35/36] mm: re-enable THP Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov 2015-06-23 13:46 ` [PATCHv7 36/36] thp: update documentation Kirill A. Shutemov 2015-06-23 13:46 ` Kirill A. Shutemov
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