From: Liang Chen Date: Tue, 15 Mar 2016 21:56:42 +0000 (-0700) Subject: mm/mempolicy.c: skip VM_HUGETLB and VM_MIXEDMAP VMA for lazy mbind X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4355c018c2ba8017592520573e76ad376ad656db;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git mm/mempolicy.c: skip VM_HUGETLB and VM_MIXEDMAP VMA for lazy mbind VM_HUGETLB and VM_MIXEDMAP vma needs to be excluded to avoid compound pages being marked for migration and unexpected COWs when handling hugetlb fault. Thanks to Naoya Horiguchi for reminding me on these checks. Signed-off-by: Liang Chen Signed-off-by: Gavin Guo Suggested-by: Naoya Horiguchi Acked-by: David Rientjes Cc: SeongJae Park Cc: Rik van Riel Cc: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 9a3f6b90e628..8cbc74387df3 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -643,7 +643,9 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end, if (flags & MPOL_MF_LAZY) { /* Similar to task_numa_work, skip inaccessible VMAs */ - if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) + if (!is_vm_hugetlb_page(vma) && + (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) && + !(vma->vm_flags & VM_MIXEDMAP)) change_prot_numa(vma, start, endvma); return 1; }