Improve Slab Automove behavior

- Skip using crawler items when calculating the automover age stats as
they can severly skew the ages in the stats to the point of completely
starving particular slabs
- Include the current window data in the window sum so we don't free
pages that are actually needed - this also matches the python script
behavior
- Reset young / old when interrupting the automove decision loop so we
don't accidentally move things which we didn't mean to

1 files changed, 10 insertions, 3 deletions

diff --git a/items.c b/items.c
index 65de923..e5347cc 100644
--- a/items.c
+++ b/items.c
@@ -660,10 +660,17 @@ void fill_item_stats_automove(item_stats_automove *am) {
         i = n | COLD_LRU;
         pthread_mutex_lock(&lru_locks[i]);
         cur->evicted = itemstats[i].evicted;
-        if (tails[i]) {
-            cur->age = current_time - tails[i]->time;
-        } else {
+        if (!tails[i]) {
             cur->age = 0;
+        } else if (tails[i]->nbytes == 0 && tails[i]->nkey == 0 && tails[i]->it_flags == 1) {
+            /* it's a crawler, check previous entry */
+            if (tails[i]->prev) {
+               cur->age = current_time - tails[i]->prev->time;
+            } else {
+               cur->age = 0;
+            }
+        } else {
+            cur->age = current_time - tails[i]->time;
         }
         pthread_mutex_unlock(&lru_locks[i]);
      }