diff options
author | Hugh Dickins <hugh@veritas.com> | 2008-02-05 06:29:23 (GMT) |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 17:44:18 (GMT) |
commit | 5a9bbdcd29adbb786c53eba1dfc3c2d256020d6b (patch) | |
tree | 44fbcff2ad653d7a328bab3144d63da9aaea6f7a /mm | |
parent | 9eccf2a816ed0aad82b577de6a40cd098ad41944 (diff) | |
download | linux-fsl-qoriq-5a9bbdcd29adbb786c53eba1dfc3c2d256020d6b.tar.xz |
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>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/rmap.c | 5 |
1 files changed, 4 insertions, 1 deletions
@@ -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 |