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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>
This commit is contained in:
Hugh Dickins 2012-12-19 17:44:29 -08:00 committed by Linus Torvalds
parent 2832bc19f6
commit b6b19f25f6
1 changed files with 8 additions and 8 deletions
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16
mm/ksm.c
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@ -1624,7 +1624,7 @@ int page_referenced_ksm(struct page *page, struct mem_cgroup *memcg,
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 @@ int page_referenced_ksm(struct page *page, struct mem_cgroup *memcg,
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 @@ int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
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 @@ int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
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 @@ int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
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 @@ int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
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;