RFR: 8284849: Add deoptimization to unified logging [v10]

[Coleen Phillimore]

On Tue, 14 Jun 2022 09:08:55 GMT, Johan Sjölén <duke at openjdk.java.net> wrote:

>> This PR adds a new "deoptimization" tag and a new log message on the info level mimicking JFR's deoptimization event. In the future this tag will be used to add trace level information, hopefully replacing TraceDeoptimization. JFR's event also captures the stacktrace, which this does not (happy to add this if considered important).
>> 
>> An example output looks like this: 
>> 
>> 
>> [1.324s][debug][deoptimization] cid=236 level=4java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(I)Z trap_bci=26 unstable_if reinterpret pc=0x00007f8b30bf8b94 relative_pc=0x0000000000000174
>> 
>> 
>> Passes tier1.
>
> Johan Sjölén has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix comments

Just a couple of small tweaks. Thanks.

src/hotspot/share/runtime/deoptimization.cpp line 1841:

> 1839: #endif // INCLUDE_JFR
> 1840: 
> 1841: void log_deopt(CompiledMethod* nm, Method* tm, intptr_t pc, frame& fr, int trap_bci,

Add 'static' keyword so it has internal linkage.

src/hotspot/share/runtime/deoptimization.hpp line 47:

> 45:   friend class EscapeBarrier;
> 46: 
> 47:  public:

You can revert changes to this file since this wasn't part of your change.  Somebody can fix this some other time when they're changing this file.

-------------

Changes requested by coleenp (Reviewer).

PR: https://git.openjdk.org/jdk/pull/8812