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mm: Move change_prot_numa outside CONFIG_ARCH_USES_NUMA_PROT_NONE

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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>
This commit is contained in:
Aneesh Kumar K.V 2013-12-06 00:08:22 +05:30 committed by Benjamin Herrenschmidt
parent 2c49195b6a
commit 5877231f64
2 changed files with 3 additions and 4 deletions
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2
include/linux/mm.h
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@ -1842,7 +1842,7 @@ static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
}
#endif
#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
#ifdef CONFIG_NUMA_BALANCING
unsigned long change_prot_numa(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
#endif

5
mm/mempolicy.c
View file

@ -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.