[PATCH tip/core/rcu 19/26] rcu: Stop shrinker loop

paulmck
2020-06-23T00:22:32Z

From: Peter Enderborg <peter.enderborg@sony.com>

The count and scan can be separated in time, and there is a fair chance
that all work is already done when the scan starts, which might in turn
result in a needless retry. This commit therefore avoids this retry by
returning SHRINK_STOP.

Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Peter Enderborg <peter.enderborg@sony.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 67912ad..0806762 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3314,7 +3314,7 @@ kfree_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
break;
}

- return freed;
+ return freed == 0 ? SHRINK_STOP : freed;
}

static struct shrinker kfree_rcu_shrinker = {
--
2.9.5