Now there are no readers of shrinker_rwsem, so
synchronize_shrinkers() does not need to hold the
writer of shrinker_rwsem to wait for all running
shinkers to complete, synchronize_srcu() is enough.
Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
---
mm/vmscan.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 89602e97583a..d1a95d60d127 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -794,15 +794,11 @@ EXPORT_SYMBOL(unregister_shrinker);
/**
* synchronize_shrinkers - Wait for all running shrinkers to complete.
*
- * This is equivalent to calling unregister_shrink() and register_shrinker(),
- * but atomically and with less overhead. This is useful to guarantee that all
- * shrinker invocations have seen an update, before freeing memory, similar to
- * rcu.
+ * This is useful to guarantee that all shrinker invocations have seen an
+ * update, before freeing memory.
*/
void synchronize_shrinkers(void)
{
- down_write(&shrinker_rwsem);
- up_write(&shrinker_rwsem);
synchronize_srcu(&shrinker_srcu);
}
EXPORT_SYMBOL(synchronize_shrinkers);
--
2.20.1
