ksm: make rmap walks more scalable

The rmap walks in ksm.c are like those in rmap.c: they can safely be
done with anon_vma_lock_read().

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 8 deletions

diff --git a/mm/ksm.c b/mm/ksm.c
index 82dfb4b54321..51573858938d 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1624,7 +1624,7 @@ again:
                 struct anon_vma_chain *vmac;
                 struct vm_area_struct *vma;
 
-                anon_vma_lock_write(anon_vma);
+                anon_vma_lock_read(anon_vma);
                 anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
                                                0, ULONG_MAX) {
                         vma = vmac->vma;
@@ -1648,7 +1648,7 @@ again:
                         if (!search_new_forks || !mapcount)
                                 break;
                 }
-                anon_vma_unlock(anon_vma);
+                anon_vma_unlock_read(anon_vma);
                 if (!mapcount)
                         goto out;
         }
@@ -1678,7 +1678,7 @@ again:
                 struct anon_vma_chain *vmac;
                 struct vm_area_struct *vma;
 
-                anon_vma_lock_write(anon_vma);
+                anon_vma_lock_read(anon_vma);
                 anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
                                                0, ULONG_MAX) {
                         vma = vmac->vma;
@@ -1697,11 +1697,11 @@ again:
                         ret = try_to_unmap_one(page, vma,
                                         rmap_item->address, flags);
                         if (ret != SWAP_AGAIN || !page_mapped(page)) {
-                                anon_vma_unlock(anon_vma);
+                                anon_vma_unlock_read(anon_vma);
                                 goto out;
                         }
                 }
-                anon_vma_unlock(anon_vma);
+                anon_vma_unlock_read(anon_vma);
         }
         if (!search_new_forks++)
                 goto again;
@@ -1731,7 +1731,7 @@ again:
                 struct anon_vma_chain *vmac;
                 struct vm_area_struct *vma;
 
-                anon_vma_lock_write(anon_vma);
+                anon_vma_lock_read(anon_vma);
                 anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
                                                0, ULONG_MAX) {
                         vma = vmac->vma;
@@ -1749,11 +1749,11 @@ again:
 
                         ret = rmap_one(page, vma, rmap_item->address, arg);
                         if (ret != SWAP_AGAIN) {
-                                anon_vma_unlock(anon_vma);
+                                anon_vma_unlock_read(anon_vma);
                                 goto out;
                         }
                 }
-                anon_vma_unlock(anon_vma);
+                anon_vma_unlock_read(anon_vma);
         }
         if (!search_new_forks++)
                 goto again;