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| author | Hugh Dickins <hugh.dickins@tiscali.co.uk> | 2009-12-15 04:59:21 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 19:53:19 +0300 |
| commit | 08beca44dfb0ab008e365163df70dbd302ae1508 (patch) | |
| tree | 33f3ddf5460e139bd7fd37e8c08026a7d852c3da /mm/internal.h | |
| parent | 7b6ba2c7d3baf8cd9f888e05563dcc32e368baab (diff) | |
| download | linux-08beca44dfb0ab008e365163df70dbd302ae1508.tar.xz | |
ksm: stable_node point to page and back
Add a pointer to the ksm page into struct stable_node, holding a reference
to the page while the node exists. Put a pointer to the stable_node into
the ksm page's ->mapping.
Then we don't need get_ksm_page() while traversing the stable tree: the
page to compare against is sure to be present and correct, even if it's no
longer visible through any of its existing rmap_items.
And we can handle the forked ksm page case more efficiently: no need to
memcmp our way through the tree to find its match.
Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Izik Eidus <ieidus@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
0 files changed, 0 insertions, 0 deletions