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authorMel Gorman <mgorman@suse.de>2012-10-25 14:16:32 +0200
committerMel Gorman <mgorman@suse.de>2012-12-11 14:42:44 +0000
commit4b10e7d562c90d0a72f324832c26653947a07381 (patch)
tree733e0fc3ac3fdfe27a312bc72e4ffb07bbf0aa56 /mm/huge_memory.c
parentb24f53a0bea38b266d219ee651b22dba727c44ae (diff)
mm: mempolicy: Implement change_prot_numa() in terms of change_protection()
This patch converts change_prot_numa() to use change_protection(). As pte_numa and friends check the PTE bits directly it is necessary for change_protection() to use pmd_mknuma(). Hence the required modifications to change_protection() are a little clumsy but the end result is that most of the numa page table helpers are just one or two instructions. Signed-off-by: Mel Gorman <mgorman@suse.de>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 5723b551c02..d79f7a55bf6 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1147,7 +1147,7 @@ out:
}
int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, pgprot_t newprot)
+ unsigned long addr, pgprot_t newprot, int prot_numa)
{
struct mm_struct *mm = vma->vm_mm;
int ret = 0;
@@ -1155,7 +1155,17 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
if (__pmd_trans_huge_lock(pmd, vma) == 1) {
pmd_t entry;
entry = pmdp_get_and_clear(mm, addr, pmd);
- entry = pmd_modify(entry, newprot);
+ if (!prot_numa)
+ entry = pmd_modify(entry, newprot);
+ else {
+ struct page *page = pmd_page(*pmd);
+
+ /* only check non-shared pages */
+ if (page_mapcount(page) == 1 &&
+ !pmd_numa(*pmd)) {
+ entry = pmd_mknuma(entry);
+ }
+ }
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
ret = 1;