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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2013-12-06 00:08:22 +0530
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-12-09 11:40:23 +1100
commit5877231f646bbd6d1d545e7af83aaa6e6b746013 (patch)
treed0ca877cb929b73087aafa19ca884409391f0ebc /mm
parent2c49195b6aedd21ff1cd1e095fab9866fba3411b (diff)
downloadop-kernel-dev-5877231f646bbd6d1d545e7af83aaa6e6b746013.zip
op-kernel-dev-5877231f646bbd6d1d545e7af83aaa6e6b746013.tar.gz
mm: Move change_prot_numa outside CONFIG_ARCH_USES_NUMA_PROT_NONE
change_prot_numa should work even if _PAGE_NUMA != _PAGE_PROTNONE. On archs like ppc64 that don't use _PAGE_PROTNONE and also have a separate page table outside linux pagetable, we just need to make sure that when calling change_prot_numa we flush the hardware page table entry so that next page access result in a numa fault. We still need to make sure we use the numa faulting logic only when CONFIG_NUMA_BALANCING is set. This implies the migrate-on-fault (Lazy migration) via mbind will only work if CONFIG_NUMA_BALANCING is set. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mempolicy.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index eca4a31..9f73b29 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -613,7 +613,7 @@ static inline int queue_pages_pgd_range(struct vm_area_struct *vma,
return 0;
}
-#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
+#ifdef CONFIG_NUMA_BALANCING
/*
* This is used to mark a range of virtual addresses to be inaccessible.
* These are later cleared by a NUMA hinting fault. Depending on these
@@ -627,7 +627,6 @@ unsigned long change_prot_numa(struct vm_area_struct *vma,
unsigned long addr, unsigned long end)
{
int nr_updated;
- BUILD_BUG_ON(_PAGE_NUMA != _PAGE_PROTNONE);
nr_updated = change_protection(vma, addr, end, vma->vm_page_prot, 0, 1);
if (nr_updated)
@@ -641,7 +640,7 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
{
return 0;
}
-#endif /* CONFIG_ARCH_USES_NUMA_PROT_NONE */
+#endif /* CONFIG_NUMA_BALANCING */
/*
* Walk through page tables and collect pages to be migrated.
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