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Date: Mon, 14 Nov 2016 16:25:29 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Dan Williams <dan.j.williams@...el.com> Cc: Michal Hocko <mhocko@...e.com>, linux-nvdimm@...1.01.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Vlastimil Babka <vbabka@...e.cz>, "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> Subject: Re: [PATCH] mm: disable numa migration faults for dax vmas On Fri, 11 Nov 2016 20:21:41 -0800 Dan Williams <dan.j.williams@...el.com> wrote: > Mark dax vmas as not migratable to exclude them from task_numa_work(). > This is especially relevant for device-dax which wants to ensure > predictable access latency and not incur periodic faults. > > ... > > @@ -177,6 +178,9 @@ static inline bool vma_migratable(struct vm_area_struct *vma) > if (vma->vm_flags & (VM_IO | VM_PFNMAP)) > return false; > > + if (vma_is_dax(vma)) > + return false; > + > #ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION > if (vma->vm_flags & VM_HUGETLB) > return false; I don't think the reader could figure out why this code is here, so... this? --- a/include/linux/mempolicy.h~mm-disable-numa-migration-faults-for-dax-vmas-fix +++ a/include/linux/mempolicy.h @@ -180,6 +180,10 @@ static inline bool vma_migratable(struct if (vma->vm_flags & (VM_IO | VM_PFNMAP)) return false; + /* + * DAX device mappings require predictable access latency, so avoid + * incurring periodic faults. + */ if (vma_is_dax(vma)) return false; _
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