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Diffstat (limited to 'mm/mprotect.c')
-rw-r--r--mm/mprotect.c65
1 files changed, 19 insertions, 46 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 412ba2b7326a..a597f2ffcd6f 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -37,14 +37,12 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end, pgprot_t newprot,
- int dirty_accountable, int prot_numa, bool *ret_all_same_node)
+ int dirty_accountable, int prot_numa)
{
struct mm_struct *mm = vma->vm_mm;
pte_t *pte, oldpte;
spinlock_t *ptl;
unsigned long pages = 0;
- bool all_same_node = true;
- int last_nid = -1;
pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
arch_enter_lazy_mmu_mode();
@@ -63,15 +61,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
page = vm_normal_page(vma, addr, oldpte);
if (page) {
- int this_nid = page_to_nid(page);
- if (last_nid == -1)
- last_nid = this_nid;
- if (last_nid != this_nid)
- all_same_node = false;
-
- /* only check non-shared pages */
- if (!pte_numa(oldpte) &&
- page_mapcount(page) == 1) {
+ if (!pte_numa(oldpte)) {
ptent = pte_mknuma(ptent);
updated = true;
}
@@ -104,33 +94,17 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
if (pte_swp_soft_dirty(oldpte))
newpte = pte_swp_mksoft_dirty(newpte);
set_pte_at(mm, addr, pte, newpte);
+
+ pages++;
}
- pages++;
}
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
pte_unmap_unlock(pte - 1, ptl);
- *ret_all_same_node = all_same_node;
return pages;
}
-#ifdef CONFIG_NUMA_BALANCING
-static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmd)
-{
- spin_lock(&mm->page_table_lock);
- set_pmd_at(mm, addr & PMD_MASK, pmd, pmd_mknuma(*pmd));
- spin_unlock(&mm->page_table_lock);
-}
-#else
-static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmd)
-{
- BUG();
-}
-#endif /* CONFIG_NUMA_BALANCING */
-
static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
pud_t *pud, unsigned long addr, unsigned long end,
pgprot_t newprot, int dirty_accountable, int prot_numa)
@@ -138,34 +112,33 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
pmd_t *pmd;
unsigned long next;
unsigned long pages = 0;
- bool all_same_node;
pmd = pmd_offset(pud, addr);
do {
+ unsigned long this_pages;
+
next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*pmd)) {
if (next - addr != HPAGE_PMD_SIZE)
split_huge_page_pmd(vma, addr, pmd);
- else if (change_huge_pmd(vma, pmd, addr, newprot,
- prot_numa)) {
- pages++;
- continue;
+ else {
+ int nr_ptes = change_huge_pmd(vma, pmd, addr,
+ newprot, prot_numa);
+
+ if (nr_ptes) {
+ if (nr_ptes == HPAGE_PMD_NR)
+ pages++;
+
+ continue;
+ }
}
/* fall through */
}
if (pmd_none_or_clear_bad(pmd))
continue;
- pages += change_pte_range(vma, pmd, addr, next, newprot,
- dirty_accountable, prot_numa, &all_same_node);
-
- /*
- * If we are changing protections for NUMA hinting faults then
- * set pmd_numa if the examined pages were all on the same
- * node. This allows a regular PMD to be handled as one fault
- * and effectively batches the taking of the PTL
- */
- if (prot_numa && all_same_node)
- change_pmd_protnuma(vma->vm_mm, addr, pmd);
+ this_pages = change_pte_range(vma, pmd, addr, next, newprot,
+ dirty_accountable, prot_numa);
+ pages += this_pages;
} while (pmd++, addr = next, addr != end);
return pages;