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Hi: On niagara system, I am trying to resolve the Lock contention which results in low CPU usage. I have probed the Mutex hold event for heavy expensive lock releasing during user land processes test cycle. Any way to further investigate the call below is contributed by system library, user land process or kernel lock. This Mutex Hold: libsyssrv.so`__1cHSWMutexLmutexUnlock6M Thanks This