From c1886c29be0d9d799e335dc4d6a5aa02c3a919a6 Mon Sep 17 00:00:00 2001
From: Dan Riley <Daniel.Riley@cornell.edu>
Date: Tue, 9 Mar 2021 18:29:13 -0500
Subject: [PATCH] restrict FastTimerService to default arena

---
 HLTrigger/Timer/plugins/FastTimerService.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/HLTrigger/Timer/plugins/FastTimerService.cc b/HLTrigger/Timer/plugins/FastTimerService.cc
index 62abb7a78f1fe..6b4958eb68035 100644
--- a/HLTrigger/Timer/plugins/FastTimerService.cc
+++ b/HLTrigger/Timer/plugins/FastTimerService.cc
@@ -766,7 +766,8 @@ void FastTimerService::PlotsPerJob::fill_lumi(AtomicResources const& data, unsig
 ///////////////////////////////////////////////////////////////////////////////
 
 FastTimerService::FastTimerService(const edm::ParameterSet& config, edm::ActivityRegistry& registry)
-    :  // configuration
+    : tbb::task_scheduler_observer(true),
+      // configuration
       callgraph_(),
       // job configuration
       concurrent_lumis_(0),