diff options
| author | Mel Gorman <mel@csn.ul.ie> | 2010-05-24 23:32:18 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-25 17:06:58 +0200 |
| commit | 7f60c214fd3a360461f3286c6908084f7f8b1950 (patch) | |
| tree | dba48cf988a22a40796187c7274f7903a288f7f4 /mm/rmap.c | |
| parent | mm: migration: take a reference to the anon_vma before migrating (diff) | |
| download | linux-7f60c214fd3a360461f3286c6908084f7f8b1950.tar.xz linux-7f60c214fd3a360461f3286c6908084f7f8b1950.zip | |
mm: migration: share the anon_vma ref counts between KSM and page migration
For clarity of review, KSM and page migration have separate refcounts on
the anon_vma. While clear, this is a waste of memory. This patch gets
KSM and page migration to share their toys in a spirit of harmony.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index f522cb008646..b5c320f7d0a5 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -250,8 +250,7 @@ static void anon_vma_unlink(struct anon_vma_chain *anon_vma_chain) list_del(&anon_vma_chain->same_anon_vma); /* We must garbage collect the anon_vma if it's empty */ - empty = list_empty(&anon_vma->head) && !ksm_refcount(anon_vma) && - !migrate_refcount(anon_vma); + empty = list_empty(&anon_vma->head) && !anonvma_external_refcount(anon_vma); spin_unlock(&anon_vma->lock); if (empty) @@ -275,8 +274,7 @@ static void anon_vma_ctor(void *data) struct anon_vma *anon_vma = data; spin_lock_init(&anon_vma->lock); - ksm_refcount_init(anon_vma); - migrate_refcount_init(anon_vma); + anonvma_external_refcount_init(anon_vma); INIT_LIST_HEAD(&anon_vma->head); } |