Don't read meminfo if there are no shrinkers

diff --git a/linux/shrinker.c b/linux/shrinker.c
index b8fc2464e20f55781349ca769fe73082beea5556..7926be06e29f85983e331725877e351a56915680 100644 (file)
--- a/linux/shrinker.c
+++ b/linux/shrinker.c
@@ -69,8 +69,15 @@ static struct meminfo read_meminfo(void)
 void run_shrinkers(void)
 {
        struct shrinker *shrinker;
-       struct meminfo info = read_meminfo();
-       s64 want_shrink = (info.total >> 2) - info.available;
+       struct meminfo info;
+       s64 want_shrink;
+
+       /* Fast out if there are no shrinkers to run. */
+       if (list_empty(&shrinker_list))
+               return;
+
+       info = read_meminfo();
+       want_shrink = (info.total >> 2) - info.available;
 
        if (want_shrink <= 0)
                return;