RFR: JDK-8275865: Print deoptimization statistics in product builds [v2]

[Tobias Hartmann]

On Wed, 27 Oct 2021 11:43:47 GMT, Volker Simonis <simonis at openjdk.org> wrote:

>> Deoptimization statistics are already gathered in product builds but for some (probably historical) reasons aren't printed to the VM/Compiler log. These statics can be useful when analyzing the reasons for deoptimization and frequent recompilations.
>> 
>> Because the statistics are already collected anyway, printing them at VM-exit if either `-XX:+LogCompilation` or `-XX:+LogVMOutput` are set won't introduce any runtime overhead.
>
> Volker Simonis has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix C1 case which doesn't print deoptimization statistics

Changes requested by thartmann (Reviewer).

test/hotspot/jtreg/runtime/logging/DeoptStats.java line 46:

> 44: public class DeoptStats {
> 45: 
> 46:   static class Value {

We use +4 space indentation for Java files.

test/hotspot/jtreg/runtime/logging/DeoptStats.java line 67:

> 65:       verify(args);
> 66:     }
> 67:     else {

Line break should be removed.

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PR: https://git.openjdk.java.net/jdk/pull/6103