RFR: 8257847: Tiered should publish MDO data pointer for interpreter after profile start [v3]

[Dean Long]

On Tue, 8 Dec 2020 18:06:27 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> Tiered policy may decide to start profiling in interpreter if C1 is overloaded with requests. It should publish an appropriate data pointer for the current bci in order for the interpreter to start profiling immediately and not wait for the second invocation.
>
> Igor Veresov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Make the code more robust

Marked as reviewed by dlong (Reviewer).

src/hotspot/share/compiler/tieredThresholdPolicy.cpp line 833:

> 831:     if (mdo != NULL) {
> 832:       JavaThread* jt = THREAD->as_Java_thread();
> 833:       frame last_frame = jt->last_frame();

Some interpreter code is using LastFrameAccessor instead.  Does it matter here?

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PR: https://git.openjdk.java.net/jdk/pull/1683