Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5a9bbdcd29adbb786c53eba1dfc3c2d256020d6b
Commit: 5a9bbdcd29adbb786c53eba1dfc3c2d256020d6b
Parent: 9eccf2a816ed0aad82b577de6a40cd098ad41944
Author: Hugh Dickins <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 4 22:29:23 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Feb 5 09:44:18 2008 -0800
mm: don't waste swap on locked pages
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]>
Cc: Ethan Solomita <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
mm/rmap.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/mm/rmap.c b/mm/rmap.c
index 0334c8f..57ad276 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -283,7 +283,10 @@ static int page_referenced_one(struct page *page,
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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