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authorHugh Dickins <hugh@veritas.com>2008-02-05 01:29:23 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 12:44:18 -0500
commit5a9bbdcd29adbb786c53eba1dfc3c2d256020d6b (patch)
tree44fbcff2ad653d7a328bab3144d63da9aaea6f7a
parent9eccf2a816ed0aad82b577de6a40cd098ad41944 (diff)
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 <hugh@veritas.com> Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Ethan Solomita <solo@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/rmap.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 0334c8f6b741..57ad276900c9 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -283,7 +283,10 @@ static int page_referenced_one(struct page *page,
283 if (!pte) 283 if (!pte)
284 goto out; 284 goto out;
285 285
286 if (ptep_clear_flush_young(vma, address, pte)) 286 if (vma->vm_flags & VM_LOCKED) {
287 referenced++;
288 *mapcount = 1; /* break early from loop */
289 } else if (ptep_clear_flush_young(vma, address, pte))
287 referenced++; 290 referenced++;
288 291
289 /* Pretend the page is referenced if the task has the 292 /* Pretend the page is referenced if the task has the