try_to_unmap always fails on a page found in a VM_LOCKED vma (unless
migrating), and recycles it back to the active list. But if it's an
anonymous page, we've already allocated swap to it: just wasting swap.
Spot locked pages in page_referenced_one and treat them as referenced.
Signed-off-by: Hugh Dickins <[email protected]>
Tested-by: KAMEZAWA Hiroyuki <[email protected]>
---
mm/rmap.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- 2.6.24-rc3-git/mm/rmap.c 2007-11-27 05:00:22.000000000 +0000
+++ linux/mm/rmap.c 2007-11-28 17:01:20.000000000 +0000
@@ -284,7 +284,10 @@ static int page_referenced_one(struct pa
if (!pte)
goto out;
- if (ptep_clear_flush_young(vma, address, pte))
+ if (vma->vm_flags & VM_LOCKED) {
+ referenced++;
+ *mapcount = 1; /* break early from loop */
+ } else if (ptep_clear_flush_young(vma, address, pte))
referenced++;
/* Pretend the page is referenced if the task has the
-
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