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-rw-r--r--synapse/util/caches/expiringcache.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/synapse/util/caches/expiringcache.py b/synapse/util/caches/expiringcache.py
index 4abca91f6d..465adc54a8 100644
--- a/synapse/util/caches/expiringcache.py
+++ b/synapse/util/caches/expiringcache.py
@@ -16,6 +16,7 @@
 import logging
 from collections import OrderedDict
 
+from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.util.caches import register_cache
 
 logger = logging.getLogger(__name__)
@@ -63,7 +64,10 @@ class ExpiringCache(object):
             return
 
         def f():
-            self._prune_cache()
+            run_as_background_process(
+                "prune_cache_%s" % self._cache_name,
+                self._prune_cache,
+            )
 
         self._clock.looping_call(f, self._expiry_ms / 2)