if (TestClearPageMlocked(page)) {
dec_zone_page_state(page, NR_MLOCK);
if (!isolate_lru_page(page)) {
- int ret = try_to_munlock(page);
+ int ret = SWAP_AGAIN;
+
+ /*
+ * Optimization: if the page was mapped just once,
+ * that's our mapping and we don't need to check all the
+ * other vmas.
+ */
+ if (page_mapcount(page) > 1)
+ ret = try_to_munlock(page);
/*
* did try_to_unlock() succeed or punt?
*/
* For vmas that pass the filters, merge/split as appropriate.
*/
static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev,
- unsigned long start, unsigned long end, unsigned int newflags)
+ unsigned long start, unsigned long end, vm_flags_t newflags)
{
struct mm_struct *mm = vma->vm_mm;
pgoff_t pgoff;
int nr_pages;
int ret = 0;
- int lock = newflags & VM_LOCKED;
+ int lock = !!(newflags & VM_LOCKED);
if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) ||
is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm))
prev = vma;
for (nstart = start ; ; ) {
- unsigned int newflags;
+ vm_flags_t newflags;
/* Here we know that vma->vm_start <= nstart < vma->vm_end. */
goto out;
for (vma = current->mm->mmap; vma ; vma = prev->vm_next) {
- unsigned int newflags;
+ vm_flags_t newflags;
newflags = vma->vm_flags | VM_LOCKED;
if (!(flags & MCL_CURRENT))
if (!can_do_mlock())
goto out;
- lru_add_drain_all(); /* flush pagevec */
+ if (flags & MCL_CURRENT)
+ lru_add_drain_all(); /* flush pagevec */
down_write(¤t->mm->mmap_sem);