记录一次偏向锁撤销导致系统停顿的问题

1.现象

 某次上线公司内部系统时候，发现系统反应很慢，停顿时间过长。

2.问题排查

遇到这种情况，推测是频繁GC导致，首先是查看日志（配置参数-XX:+PrintGCApplicationStoppedTime），结果如下：

Total time for which application threads were stopped: 0.0050077 seconds, Stopping threads took: 0.0009924
Total time for which application threads were stopped: 0. 0048003 seconds, Stopping threads took: 0.000722
Total time for which application threads were stopped: 0. 0042130 seconds, Stopping threads took: 0.0006124
Total time for which application threads were stopped: 0.0167637 seconds, Stopping threads took: 0. 0002226
Total time for which appLication threads were stopped: 0.0041316 seconds, stopping threads took: 0.0003492
Total time for which application threads were stopped: 0.0116966 seconds, Stopping threads took:

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