RFR: 8271931: Make AbortVMOnVMOperationTimeout more resilient to OS scheduling [v2]

[Aleksey Shipilev]

On Fri, 6 Aug 2021 12:01:49 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Perform VM-op timeout also on the VM thread. If a VM-op is stuck, the existing watcher-thread based machinery will kick in and detect it.
>> 
>> Test: tier1
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Yeah, that looks fine. I have two minor suggestions.

src/hotspot/share/runtime/vmThread.cpp line 93:

> 91:     fatal("%s VM operation took too long: completed in " JLONG_FORMAT " ms (timeout: " INTX_FORMAT " ms)",
> 92:           _vm_op_name, vm_op_duration, AbortVMOnVMOperationTimeoutDelay);
> 93:   }

Should we null `_vm_op_name` here?

src/hotspot/share/runtime/vmThread.hpp line 42:

> 40:   volatile int _armed;
> 41:   jlong _arm_time;
> 42:   const char* _vm_op_name = nullptr;

Style question: are we doing these inits inline, instead of constructor?

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5016