diff options
| author | Hugh Dickins <hugh@veritas.com> | 2004-08-23 21:24:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-08-23 21:24:46 -0700 |
| commit | 6992904141794e1d5f6ef2e9b770ba491550a237 (patch) | |
| tree | 07fd2e4dec00ab9ae701a6c540621f9e7d8e73e6 /include/linux | |
| parent | 9d9ae43b26ac90bab0213b8bb1245ac9ef966a97 (diff) | |
[PATCH] rmaplock: swapoff use anon_vma
Swapoff can make good use of a page's anon_vma and index, while it's still
left in swapcache, or once it's brought back in and the first pte mapped back:
unuse_vma go directly to just one page of only those vmas with the same
anon_vma. And unuse_process can skip any vmas without an anon_vma (extending
the hugetlb check: hugetlb vmas have no anon_vma).
This just hacks in on top of the existing procedure, still going through all
the vmas of all the mms in mmlist. A more elegant procedure might replace
mmlist by a list of anon_vmas: but that would be more work to implement, with
apparently more overhead in the common paths.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rmap.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index d8aa006a5fe5..291d36c9e987 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -91,6 +91,11 @@ static inline void page_dup_rmap(struct page *page) int page_referenced(struct page *, int is_locked); int try_to_unmap(struct page *); +/* + * Used by swapoff to help locate where page is expected in vma. + */ +unsigned long page_address_in_vma(struct page *, struct vm_area_struct *); + #else /* !CONFIG_MMU */ #define anon_vma_init() do {} while (0) |