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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2014-01-22 03:49:49 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-22 04:19:45 +0400
commit0dd1c7bbce8d1d142bb25aefaa50262dfd77cb78 (patch)
treed45df52098c0a8364a3e614096bb3ee184aeb068 /mm/ksm.c
parent051ac83adf69eea4f57a97356e4282e395a5fa6d (diff)
downloadlinux-0dd1c7bbce8d1d142bb25aefaa50262dfd77cb78.tar.xz
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 'mm/ksm.c')
-rw-r--r--mm/ksm.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/ksm.c b/mm/ksm.c
index c3035fee8080..91b8cb35f7cc 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2032,12 +2032,19 @@ again:
if ((rmap_item->mm == vma->vm_mm) == search_new_forks)
continue;
+ if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
+ continue;
+
ret = rwc->rmap_one(page, vma,
rmap_item->address, rwc->arg);
if (ret != SWAP_AGAIN) {
anon_vma_unlock_read(anon_vma);
goto out;
}
+ if (rwc->done && rwc->done(page)) {
+ anon_vma_unlock_read(anon_vma);
+ goto out;
+ }
}
anon_vma_unlock_read(anon_vma);
}