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author | Joonsoo Kim <iamjoonsoo.kim@lge.com> | 2014-01-21 15:49:49 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-21 16:19:45 -0800 |
commit | 0dd1c7bbce8d1d142bb25aefaa50262dfd77cb78 (patch) | |
tree | d45df52098c0a8364a3e614096bb3ee184aeb068 /include | |
parent | 051ac83adf69eea4f57a97356e4282e395a5fa6d (diff) | |
download | linux-0dd1c7bbce8d1d142bb25aefaa50262dfd77cb78.tar.bz2 |
mm/rmap: extend rmap_walk_xxx() to cope with different cases
There are a lot of common parts in traversing functions, but there are
also a little of uncommon parts in it. By assigning proper function
pointer on each rmap_walker_control, we can handle these difference
correctly.
Following are differences we should handle.
1. difference of lock function in anon mapping case
2. nonlinear handling in file mapping case
3. prechecked condition:
checking memcg in page_referenced(),
checking VM_SHARE in page_mkclean()
checking temporary vma in try_to_unmap()
4. exit condition:
checking page_mapped() in try_to_unmap()
So, in this patch, I introduce 4 function pointers to handle above
differences.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/rmap.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 6a456ce6de20..616aa4d05f0a 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -235,10 +235,25 @@ struct anon_vma *page_lock_anon_vma_read(struct page *page); void page_unlock_anon_vma_read(struct anon_vma *anon_vma); int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma); +/* + * rmap_walk_control: To control rmap traversing for specific needs + * + * arg: passed to rmap_one() and invalid_vma() + * rmap_one: executed on each vma where page is mapped + * done: for checking traversing termination condition + * file_nonlinear: for handling file nonlinear mapping + * anon_lock: for getting anon_lock by optimized way rather than default + * invalid_vma: for skipping uninterested vma + */ struct rmap_walk_control { void *arg; int (*rmap_one)(struct page *page, struct vm_area_struct *vma, unsigned long addr, void *arg); + int (*done)(struct page *page); + int (*file_nonlinear)(struct page *, struct address_space *, + struct vm_area_struct *vma); + struct anon_vma *(*anon_lock)(struct page *page); + bool (*invalid_vma)(struct vm_area_struct *vma, void *arg); }; /* |