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-rw-r--r--synapse/util/logcontext.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/util/logcontext.py b/synapse/util/logcontext.py
index 8a36bbf32d..8c57671b66 100644
--- a/synapse/util/logcontext.py
+++ b/synapse/util/logcontext.py
@@ -23,7 +23,8 @@ logger = logging.getLogger(__name__)
 
 
 def _get_cpu_time():
-    return getrusage(RUSAGE_SELF).ru_utime * 1000
+    # Cheekily use RUSAGE_THREAD. THIS IS NOT PORTABLE
+    return getrusage(1).ru_utime * 1000
 
 
 class LoggingContext(object):