title: jvm options -XX:+SafepointTimeout -XX:SafepointTimeoutDelay look don't work
body: <p>I detected on a server long safepoints (>10sec!) in jvm safepoint.log:</p>
  
  <pre><code>6534.953: no vm operation                  [     353          0              4    ]      [     0     0 14179     0     0    ]  0
  7241.410: RevokeBias                       [     357          0              1    ]      [     0     0 14621     0     0    ]  0
  8501.278: BulkRevokeBias                   [     356          0              6    ]      [     0     0 13440     0     2    ]  0
  9667.681: no vm operation                  [     349          0              8    ]      [     0     0 15236     0     0    ]  0
  12094.170: G1IncCollectionPause             [     350          0              4    ]      [     0     0 15144     1    24    ]  0
  13383.412: no vm operation                  [     348          0              4    ]      [     0     0 15783     0     0    ]  0
  13444.109: RevokeBias                       [     349          0              2    ]      [     0     0 16084     0     0    ]  0
  </code></pre>
  
  <p>On my laptop I've played with -XX:SafepointTimeoutDelay=2
  and it works good, printing bad threads:</p>
  
  <pre><code># SafepointSynchronize::begin: Timeout detected: 
  ...
  # SafepointSynchronize::begin: (End of list)
  &lt;writer thread='11267'/&gt;
           vmop                    [threads: total initially_running wait_to_block]    [time: spin block sync cleanup vmop] page_trap_count
  567.766: BulkRevokeBias                   [      78          1              2    ]      [     0     6     6     0     0    ]  0
  </code></pre>
  
  <p>So I've added to options to the server:
  <strong>-XX:+SafepointTimeout -XX:SafepointTimeoutDelay=1000</strong>
  to see which threads cause the problem, <strong>but I don't see any prints, while I still see long safepoint times</strong>.</p>
  
  <p>Why doesn't it applied on the server?</p>
  
  <p>Here is the actual server config (taken from safepoint.log):</p>
  
  <pre><code>Java HotSpot(TM) 64-Bit Server VM (25.202-b08) for linux-amd64 JRE (1.8.0_202-b08), built on Dec 15 2018 12:40:22 by &amp;quot;java_re&amp;quot; with gcc 7.3.0
  ...
  -XX:+PrintSafepointStatistics 
  -XX:PrintSafepointStatisticsCount=10
  -XX:+UnlockDiagnosticVMOptions 
  -XX:+LogVMOutput
  -XX:LogFile=/opt/pprb/card-pro/pci-pprb-eip57/logs/safepoint.log
  -XX:+SafepointTimeout 
  -XX:SafepointTimeoutDelay=1000
  ...
  </code></pre>